CC BY
16
ISSN 2617-2909 (print) ISSN 2617-2119 (online)
Journ.GeoI. Geograph.
Geology, 29(1), 135-145. doi: 10.15421/112012
Oleksandr M. Masiuk, Mykola M. Kharytonov, Sergey A. Stankevich Journ. Geol. Geograph. Geoecology, 29 (1), 135-145.
Remote and ground-based observations of land cover restoration after forest reclamation within a brown coal basin
Oleksandr M. Masiuk1, Mykola M. Kharytonov2, Sergey A. Stankevich3
1Oles Honchar Dnipro National University, Dnipro, Ukraine, [email protected]
2Dnipro State Agrarian and Economic University, Dnipro, Ukraine, [email protected]
3Scientific Centre for Aerospace Research of the Earth, NAS of Ukraine, Kyiv, Ukraine, [email protected]
Received: 30.06.2019 Abstract. The Semyonovsky - Golovkovsky brown - coal deposit is located within the
Received in revised form: 04.12.2019 boundaries of the Dnieper basin geological group and is located in the Alexandria mining Accepted: 07.12.2019 region on the watershed of the Ingulets and Beshka rivers. Overburden rocks are loess -
like, red - brown and glauconite - containing loams, kaolin and carbonaceous clays quartz, glauconite - containing and carbonaceous sands. The total area of reclaimed land was about 1006 hectares, of which 39 % was used for agriculture, 2 % was pasture and 59 % under forest reclamation. Geomorphologic assessment of the studied area was performed using Sentinel-1 satellite radar interferometry. Multispectral imagery of Sentinel -2 satellite system was used for remote assessment within the study area. We assessed the state of the Robina pseudoacacia plants growing under various forest conditions, in plantations created on the reclaimed landscapes of the Semenovsky - Golovkovsky brown coal basin. The processes of self-regulation and restoration of fertility on the reclaimed lands at the first stages of their biological development were slowed down. This significantly reduced the resistance of phytocenoses, both pure and mixed, to the conditions of the environment to which they were exposed. A comparison of the inventory stem wood of the black locust showed the superiority of monoculture plantations to mixed stands of pine - black locust and maple - black locust. The forest-forming process progresses with age. Remote assessment of the territories was conducted to assess the future prospects of biological conservation of reclaimed lands. The influence of the anthropogenic factor is observed throughout the section and is manifested in the man-made formation of the relief, reshaping of dumps, removal to the surface of overburden rocks. It is established that the height values can vary from 85 m to 213 m. 82.8 % of the surveyed area has not undergone significant changes in relief. About 15.5 % of the territory was under the influence of alluvial - diluvia processes. There have been corresponding changes in the share of vegetation according to vegetation cover fraction (VCF) over the past three years. The highest moisture content at the level of 0.2 - 0.3 relative units in 2015 was recorded in the territory occupying 78.4 % . Meanwhile, the shares of land cover with this level of humidity increased by almost 9% during the following 3 years to 2018. The highest density of vegetative cover was recorded in the North -Western part of the study area of forest reclamation. Thus, considering the potential suitability of the area for forest reclamation, we should note the important role of geomorphological, geological and water resources for the growth and development (formation) of plant communities
Key words: forest reclamation, land cover, remote sensing
Дистанцшш та наземш спостереження вщновлення земельного покрову шсля лковоТ рекультиваци у буровугшьному басейш
Олександр M. Масюк1, Микола M. Харитонов2, Серий A. Станкевич3
1 Днтровсъкий Нащоналънийутверситет iм..Олеся Гончара, Днтро, Украгна, [email protected] 2Днпровсъкий державний аграрно - eKOHOMi4Hийутверситет, Днтро, Украгна, [email protected] 3Науковий Центр Аерокосмiчних до^дженъ 3eMni, НАН Украгни, Кигв, Украгна, [email protected]
Анотащя. Семеновсько-Головювське буровугшьне родовище знаходиться в межах геолопчно! групи Дншровського басейну i розташоване в Олександршському райош на вододш р1чок 1нгулець i Бешка. Воно являе собою вщпрацьований кар'ер на денну поверхню якого винесеш прсью породи надвугшьно! товщг Розкривш породи представлеш лесоподiбними, червоно-бурими i глаукоштвмщуючими суглинками, каолшовими i вуглистими глинами, глаукоштовими i вуглистими тсками. За-гальна площа рекультивованих земель склала близько 1006 га, з них тд сшьськогосподарськими угщдями - 39 % територп, пасовищами - 2 % i тд люовою рекультиващею - 59 %. Геоморфолопчну ощнку дослщжувано! територп було проведено iз застосуванням супутниково! радарно! штерферометрп Sentinel-1. Багатоспектральн зшмки супутниково! системи Senti-
Г;, f eology.
— / eography and ournaiof / "eoecolog
Journal of Qaology, Geography and Geoecology
Journal home page: geoIogy-dnu-dp.ua
пе1-2 було використано для дистанцшного спостереження дослщжувано! територп. Наведена оцшка стану насаджень робшп звичайно!, що вирощуеться в р1зних лгсорослинних умовах штучно створених на рекультивованих землях Семешвсько-Головювського буровугшьного розр1зу. Процеси саморегуляци та вщновлення родючоста на рекультивованих землях на перших етапах 1х бюлопчного освоення були сильно загальмоваш. Це значно знижувало стшюсть бшоакащевих фггоценозш, як чистих, так [ змшаних, до умов наданого 1м середовища. Прогрес формування люових насаджень вщбуваеться з вжом. Дистанцшна ощнка територш проводилася з метою ощнки перспектив бюлопчно! консерваци рекультивованих земель. Вплив антропогенного фактору спостер1гаеться по всьому розр1зу [ проявляеться в техногенному формуванш рельефу, переформуванш в1двал1в, винос на поверхню розкривних порвд. Встановлено, що значення висоти можуть варшватися в1д 85 м до 213 м. 82,8% обстежено! територп не зазнали ютотних змш рельефу. Близько 15,5% територп перебувало тд впливом алюв1ально - делюв1альних процеав. За останш 3 роки в1дм1чеш [ в1дпов1дт змши частки рослинного покриву через проективне покриття рослинноста. Найбшьший вологовмгст на р1вш 0,2 - 0,3 вщносних одиниць в 2015 рощ зафжсовано на територп, що займае 78,4 %. Тим часом, частка Грунтово-рослинного покриву з такою волопстю зб1льшилася у 2018 рощ майже на 9 % протягом трьох рок1в. Найб1льша густота рослинного покриву вщзначена в твшчно - зах1дн1й частин1 досл1джувано! територп люомелюрацп. Таким чином, розглядаючи потенцшну придатн1сть територй для мел1орацй лгав, слщ в1дзначити важливу роль геоморфолопчних, геолог1чних [ водних ресурс1в для зростання [ розвитку (формування) рослинних угруповань
Ключовi слова: лкова рекультиващя, земельний покрив, дистанцтт спостереження
Introduction. Overburden rocks in the mining process are removed by excavation. This leads to permanent changes in topography and geological structures, and disrupts the surface and subsurface hydrologic regime (Shrestha and Lal, 2011). In particular, fertile soil mixed with fragmented rocks is transported to form large - scale dumps (Zhao et al., 2013) and forest vegetation is removed with some forest biomass harvested and most bulldozed into piles and burned (Amichev et al., 2008). The natural succession process of both soil and vegetation in dumps requires a lot of time, during which, the dumps are exposed to wind and water erosion processes (Zhao et al., 2015). Thereby, restoration of soil and vegetation within a short-time period is a high priority for opencast coal mine reclamation. Meanwhile, the reclaimed mined ecosystem could be regarded as an "empty cup" with large potential to store tremendous amounts of soil nutrients and vegetation biomass (Chatterjee et al., 2009), which provides a platform to conduct both remote and ground based sensing of the development of soil and vegetation from scratch.
Composition, properties, natural overgrowth and suitability of overburden rocks for land reclamation are described in numerous case studies (Zipper, 2000; Sobek et al., 2000; Likus-Cieslik and Pietrzykowski, 2017). The suitability of dumps for afforestation with different tree and shrub species has been studied on the basis of different approaches (Casselman et al., 2006; Schaaf et al., 2000). Normal practice for revegetation is selecting drought-resistant, fast growing crops or fodder crops which can grow in nutrient deficient soils. In certain areas, the main factor in preventing vegetation is acidity. Plants must be tolerant of metal contaminants typically present at such sites (Caravaca et al., 2002; Mendez and Maier, 2008). Compaction and texture of replaced soil during reclamation of surface - mined land can limit tree growth
(Cleveland and Kjelgren, 1994). Re-forestation with black locust (Robinia pseudoacacia) is considered a successful technique that is often used for the reclamation of open-cast mine areas (Vlachodimos et al., 2013; Sytnyk et al., 2016). R. pseudoacacia as a nitrogen-fixing plant enriches soil with organic and inorganic nitrogen and organic matter to a greater extent than natural grasses. Most physicochemical properties in reclaimed mine soils under R. pseudoacacia monoculture forest become considerably elevated with the duration of the reclamation period compared to undisturbed soils. The duration required to attain the nutrient level in undisturbed soils was about 10 years of reclamation. Overall, R. pseudoacacia has shown strong adaptation to poor soil conditions after reclamation and has markedly ameliorated soil succession in dumps (Yuan et al., 2018).
The reactions to mixture of ores and their change along a gradient of site conditions depend on the respective limiting factor and the species' potential to overcome the limitation (Forrester, 2014). Complementarity in exploitation of water and mineral nutrients is most effective and growth accelerating on sites with limitation in water and mineral nutrients. Mixed stands of Scots pine and European beech have significantly higher structural heterogeneity than monocultures of Scots pine and European beech (Pretzsch et al., 2016). Comparison based on total biomass production may bring different results, as mixing tree species can change stem-crown allometry (Pretzsch, 2014; Liang et al., 2016; Vallet and Perot, 2016) and also tree ring width and wood density (Zeller, 2016). Tree species mixing can significantly modify individual tree morphology and reduce or improve wood quality (Pretzsch and Rais, 2016).
A successful reclamation programme must include a monitoring component to identify areas of successful reclamation, as well as areas where man-
agement problems exist or where reclamation practices are failing (Lein, 2001). Monitoring of the natural environment, especially areas degraded by mining activities, is connected with the constant need for precise and up - to - date land use/land cover maps (Szostak et al., 2015; Townsend et al., 2009). Novel techniques including geoinformation technologies such as those used in making land use and land cover change maps are used for characterizing the morphometry and determination of the spatial structure of vegetation on reclaimed post-mining areas (Chmielewski et al., 2014; Dudzinska - Nowak and W^zyk, 2013; Szostak et al., 2014; W^zyk et al., 2014). Remote sensing data are useful for the investigation and monitoring of vegetation change in open pit mining areas over a long period of time. This method is useful to identify areas where vegetation may be stressed, or where reclamation requires integrated approaches (Szostak and No-wicka, 2013; Maiti et al., 2019).
The aim of our research was to make a geospa-tial assessment of land cover after the extraction of brown coal and the technical stage of reclamation of disturbed areas.
Materials and methods. The Dnipro brown coal basin occupies an area the size of more 60 000 km2. 12 brown coal areas are part of this basin. The surface of the basin is characterized as an elevated gently undulating plain, sometimes dissected by river valleys and a dense network of gullies and ravines.
Expressed dismembered relief causes the development of surface runoff. This is a factor in the formation of eroded lands with varying degrees of washout. This part of the area is affected by deep erosion. Artificial landforms in the basin are also observed together with natural geomorphological forms. These are quarry pits, trenches, overburden dumps, deformed surfaces, etc. A characteristic feature of the climate is quite a significant fluctuation in temperature and rainfall over the months.
Availability of soil productive moisture for plants is average. Approximately every fourth to fifth year is dry, due to insufficient rainfall in the spring and summer. Quite often there is a decrease (less than 50 % of the field moisture capacity) of moisture reserves, which coincides with the air drought - dry winds. Common species of forest stands are oak, ash, maple, elm, and linden).
The Semyonovsky-Golovkovsky brown - coal deposit is located within the boundaries of the group of the Dnieper basin and is located in the Alexandria mining region on the watershed of the Ingulets and Beshka rivers. Overburden rocks are loess - like, red - brown and glauconite - containing loams, quartz,
glauconite -containing and carbonaceous sands, kaolin and carbonaceous clays. The total area of reclaimed land was about 1006 hectares, of which under agricultural land occupied 39 % of the territory, pastures 2 % and land under forest reclamation - 59 %.
Overburden rocks are characterized by different texture and origin. Their uptake to the earth's surface, together with man-made dismemberment of the terrain, creates many options for the development of various forest trees and shrubs. 15 sample plots (SA) were laid in the last decade of the 20th century in the Alexandria forestry. Forest species were planted in five sites (blocks) of different age (5 - 30 years), composition of stand (pure and mixed) and different technozem composition. Rocks were represented by deposits of neogenic and anthropogenic periods with different textures: loamy, clay, sand. The sites selected for the creation of forest plantations were characterized by state of moisture and attachment to different elements of the relief. The survey of the structure and productivity of the forest stand was carried out in accordance with the requirements of forest inventory. Plantations of black locust (Robinia pseudoacacia) on technozems occupied 150.6 ha, representing 27 % of the total reclaimed area. Due to its biological features and environmental needs, the culture of black locust was used for various applications in the restoration of disturbed lands. Mixed stands occupy an area of 58 ha, of which pine or Pinus sylvestris L.(P.s) - black locust or Robinia pseudoacacia (R.p.) account for 47 % of the territory and maple-black locust - 33 %.
Geomorphological assessment of the studied area was performed using multitemporal satellite radar in-terferometry. Multispectral imagery of Sentinel-2 satellite system was engaged for remote land cover assessment within the study area. Relative soil moisture for the territory of the Semyonovsky - Golovkovsky brown-coal deposit area was estimated using the Sentinel-2 Multispectral Instrument (MSI), Landsat-8 Operational Land Imager (OLI) and Thermal Infrared Sensor (TIRS) optical multispectral data. Standard preprocessing operations including radiometric calibration, atmospheric correction and cloud masking were applied to input multispectral images. The Landsat-8 OLI/TIRS 30 m spatial resolution imagery was used to calculate true (not radiant) temperature T of land surface, while the Sentinel-2 MSI 10 m spatial resolution imagery produces the Normalized Water Index (NWI) (Sakhatsky and Stankevich, 2007). Both T and NDWI maps after co-registration was fused into land surface water content distribution (Zhang and Zhou, 2016). Normalized Difference Vegetation Index (NDVI) was computed to determine Vegeta-
tion Cover Fraction (VCF) (Zhang et al., 2006) based on Sentinel-2 Alexandria - Golovkovka 2015.08.09 and 2018.06.19 images.
Results and discussion. There is a wide variety in the spatial structure of phytocenoses in the studied plantations of black locust, depending on the diversity of forest growth conditions. The influence of the anthropogenic factor is observed throughout the coal basin and is manifested in the technogenic formation of relief, reshaping of dumps, uptake of overburden rocks to the day surface of the lignite deposit. Elevations alternate with depressions. This causes the diversity of the soil cover, both in fertility and moisture. Dynamics of forest mensuration indices of pure stands of black locust are shown in Fig.1.
Eight-year plantings were located on the slope of the eastern exposure and differed in the lowest indices of forest inventory: height - 3.0±0.034 m, diameter -4.01±0.06 cm, wood stock is 6.03±0.06 m3/ha.
The virgin plantings of black locust at the age of 11 - 13 years reached a height of 6.12±0.08 m and a diameter of 8.1±0.10 cm. There was a differentiation of wood stocks of 25 - 28 m3/ha and fluctuations in the average growth from 1.92 to 2.55 m3. 15-year-old plantations of Robinia pseudoacacia in the ravine thalweg on loamy rocks in wet conditions of moisture were surrounded by steep slopes of the south-western and north - eastern exposures. The forest stand had an average height of 7.98±0.10 m, an average diameter of 10.04±0.15 cm, wood reserves - 44.03±0.25 m3/ ha. Black locust aged 20 years has a stock of stem wood 83.1±0.40 m3/ha. Maximum forest growth effect of acacia on reclaimed lands was expressed in the average growth achieved at this age. The mono 25
- year - old Robinia pseudoacacia stands, which are in decline and are represented by loamy sediments, occupy the largest area. The range of moisture varies from moist to wet loams. The height of the stand was 11 - 12 m, diameter - 12 - 14 cm, wood reserves - 83
- 96 m3/ha, respectively. It should be noted that the average growth rates reached the maximum values at the age of 20 - 25 years - 3.84 - 4.15 m3, and the current in 15 - 20 years - 7.8 - 9.5 m3.
Some approaches have been applied in connection with the slow growth of forest crops on the dumps to intensify the growth processes. Use of methods of biological intensification of growth of tree cultures gave good results. One of them is the introduction of nitrogen fixing species into the forestry culture. Thus,
plantations were created in which 40 % was occupied by Scots pine and 60 % by Robinia pseudoacacia (Fig.2).
Plantings with the composition of the stand 6R.p.4P.s. formed in the upper third of the waste of the Western exposure on loamy sediments. Wood reserves amounted to 12.07 ±0.12m3/ha. Black locust had a height of 4.05±0.07 m, diameter - 6.06±0.09 cm, pine - 3.03±0.07m and 3.98±0.09cm respectively. It was found that with this ratio of tree species to 11 years of age, Robinia pseudoacacia was ahead of pine in terms of growth. The advantage of pure pine plantations was established on all parameters (altitude 33%, diameter by 50 % and stocks of wood at 100 %). Plants of Robinia pseudoacacia of natural origin penetrate with a decrease in the completeness of the monoculture of pine from the surrounding areas, ahead of the growth of the 11 - year - old pine (10P.s. + R.p.). In the future, with age (19 and 21 years),
Fig. 1. Dynamics of parameters of plantations of Robinia pseudoacacia
Fig. 2. Wood stocks in mixed forest stand of pine (P.s.) and black locust (R.p.)
Robinia pseudoacacia of natural origin is introduced into the monoculture of pine by 10 % (9P.s.1R.p.). However, it is significantly inferior to the growth rate of the main plant, especially in terms of wood reserves.
Mixed stands of the same age with different structure of the forest stand with the participation of Robinia pseudoacacia present another area of interest. Two sample areas had the same composition of 7 Black locusts + 3 Maples or Acer pseudoplatanus L.(A.p.) aged 10 years, but differing in geological conditions, which led to a change in the parameters of forest taxation (Fig. 3).
can note that the wood reserves on the leveled areas were 22 % higher due to greater completeness.
Results of previous similar case studies comparing the same experimental pure and mixed-species plantations have shown that productivities were either similar or greater than the same species grown in monocultures (Piotto et al., 2003; Alice et al., 2004; Petit and Montagnini, 2004; Petit and Montagnini, 2006). Meantime, it was established that mixed - species plantations have greater potential advantages than monocultures (Mao et al., 2017). The greatest use of melioration in forest plantations is through the combination of a Nitrogen (N) - fixing and a non - N
12 10 B 6 4 2 0
m
lOR.p. A.p.
5
■ É ■ JE
7 R.p. 3A.p. 7 R.p. 3A.p.
10 10 Age, year
-Isight, m
Ciameter, cm
Woodstock, m3/ha
Fig. 3. Wood stocks in mixed forest stand of pine and black locust
Maple at the age of 10 years occupies up to 30 % of such areas. Comparing the same structure of the forest stand phytocenosis (7R.p. + 3A.p.), growing in different conditions on washed and leveled areas, we
- fixing tree species (Kelty, 2006). N - fixing tree species may increase the supply of available N in the soil, benefiting both N - fixing and non - N - fixing trees. Strong facilitative effects of N - fixing species on the
growth of non - N - fixing species were found on a site with low soil N, but not on a site with high soil N (Bouillet et al., 2013).Trees and shrubs in the territory of a lignite deposit after the biological stage of reclamation were both in pure and in mixed condition.
Thus, Robinia pseudoacacia monocultures on territories of reclaimed mines had higher values of height, diameter and productivity. These plantations at the age of 5 - 11 years exceeded at this stage the dynamics of growth and wood reserves of mixed plantations. The similar results have been obtained in case studies (Bouillet et al., 2013; Mao et al., 2017; Kelty et al., 2006; Pretzsch, 2014).
The highly dynamic process of the secondary
forest succession has been shown on the tested areas of sulfur mines (Szostak et al., 2015).
Results of remote sensing of geomorphological features of the reclaimed area (terrain relief features formed in the post-reclaimed period). The studied area terrain elevations are shown in Fig.4.
The influence of the anthropogenic factor is observed throughout the section and is manifested in the man-made formation of relief, reshaping of dumps, removal to the surface of overburden rocks. It is established that the height values can vary from 85 m to 213 m. The results of these changes in the microrelief for the last 3 years (from 2015 to 2018) are presented in Figure 5 and Table 1.
Fig. 4. Terrain elevations within the study area Fig. 5. Terrain elevation change within the study area
(Sentinel-IA Alexandria - Golovkovka 2018.06.08 / 2018.06.20 (Sentinel-1, Alexandria - Golovkovka 2015.08 - 2018.06) interferometric pair)
Table 1. Legend of terrain elevation change
Code Colour Class Difference Percent
0 Unclassified no data 0.0000
1 Strong Down <-0.30 0.1223
2 Moderate Down -0.30 .. -0.15 0.7967
3 Weak Down -0.15 .. -0.05 8.0757
4 No Change -0.05 .. 0.05 82.7699
5 Weak Rise 0.05 .. 0.15 7.3865
6 Moderate Rise 0.15 .. 0.30 0.7891
7 Strong Rise >0.30 0.0597
According to the data obtained, 82.8 % of the surveyed area has not undergone significant changes in terrain elevation. About 15.5% of the territory was under the influence of alluvial-diluvia processes.
Data on the distribution of land surface water content in the summer of 2015 and 2018 within the surveyed area are shown in Fig.6 and Table 2. The logarithmic regression relationship between the (nwm)/t parameter and relative water content was restored therefor.
Elevations alternate with depressions, which causes the diversity of the soil cover, both in fertility and moisture.
The highest moisture content at the level of 0.2 - 0.3 relative units in 2015 was recorded in the territory occupying 78.4 %. Meanwhile, the shares of land cover with such humidity increased by almost 9% over the next 3 years.
VCF image differencing is successfully used to follow the long-term success of reclamation (Sarp,
2015.08.09 2018.06.19
Fig. 6. Water content distribution maps, Sentinel-2, Alexandria - Golovkovka
Table 2. Legend of water content estimation
Code Colour Value Percent Value Percent
2015.08.09 2018.06.19
0 no data 0.0000 no data 0.0000
1 0.0 0.1 0.0003 0.0-0.1 0.0014
2 0.1-0.2 1.3803 0.1-0.2 2.8939
3 0.2-0.3 78.3774 0.2-0.3 87.2895
4 0.3-0.4 18.1562 0.3-0.4 7.3259
5 0.4 0.5 0.3683 0.4-0.5 0.7078
6 0.5 0.6 0.2010 0.5-0.6 0.2217
7 0.6-0.7 0.2854 0.6-0.7 0.3207
8 0.7-0.8 0.9052 0.7-0.8 0.9199
9 0.8-0.9 0.3259 0.8-0.9 0.3192
2015.08.09 2018.06.19
Fig. 7. Vegetation cover fraction maps, Sentinel-2, Alexandria - Golovkovka Table 3. Legend of VCF parameters
Code Colour Value Percent Value Percent
2015.08.09 2018.06.19
0 no data 0.0000 no data 0.0000
1 0.0-0.1 25.6841 0.0-0.1 29.2965
2 0.1-0.2 8.6552 0.1-0.2 12.5878
3 0.2-0.3 9.0779 0.2-0.3 12.7751
4 0.3-0.4 9.4638 0.3-0.4 11.4648
5 0.4-0.5 8.6933 0.4-0.5 8.8962
6 0.5-0.6 7.6262 0.5-0.6 7.1871
7 0.6-0.7 6.3338 0.6-0.7 6.5164
8 0.7-0.8 7.1992 0.7-0.8 5.2522
9 0.8-0.9 10.3037 0.8-0.9 3.9347
10 0.9-1.0 6.9628 0.9-1.0 2.0892
2012). The classic method for NDVI-based VCF calculating from Carlson & Ripley paper (Carlson and Ripley,1997) was used:
VCF(x, y) = [(NDVI(x, y) - NDVI0)/(NDVI1 -NDVI0)]2 ,
where VCF(x, y) is VCF value inside (x, y) image element, NDVI0 and NDVI1 are NDVI thresholds
values for vegetation-free and full vegetation cover terrain respectively.
Data on the state of vegetation cover in the summer of 2015 and 2018 in the surveyed area are shown in Fig.7 and Table 3.
The VCF differentiation allows separation of vegetated areas from areas with little or no vegetative
cover. High VCF values are mostly indicated for reclaimed and vegetated areas. The highest density of vegetative cover was recorded in the North-Western part of the study area of forest reclamation. At the same time, vegetation cover fraction over the past three years decreased by codes 8-10 and increased by codes 1, 3, 4. Thus, considering the potential suitability of the area for forest reclamation, one should note the important role of geomorphological, geological and water resources for the growth and development (formation) of plant communities. Conclusion. The processes of self-regulation and restoration of fertility on reclaimed lands at the first stages of their biological development were slowed down. This significantly reduced the resistance of phytocenoses, both pure and mixed, to the conditions of the environment provided to them. A comparison of the inventory stem wood of the black locust showed the superiority of monoculture plantations to mixed stands of pine-black locust and maple - black locust. Progression of the forest-forming process takes place with age. Remote assessment of the territories was conducted to assess the future prospects of biological conservation of reclaimed lands. The influence of the anthropogenic factor is observed throughout the section and is manifested in the man - made formation of relief, reshaping of dumps, removal to the surface of overburden rocks. It is established that the terrain's height values can vary from 85 m to 213 m. 82.8 % of the surveyed area has not undergone significant changes in relief. About 15.5 % of the territory was under the influence of alluvial - diluvia processes. There have been corresponding changes in the share of vegetation using the VCF value codes over the past three years. The highest moisture content at the level of 0.2 - 0.3 relative units in 2015 was recorded in the territory occupying 78.4 %. Meanwhile, the shares of land cover with such humidity increased by almost 9 % over the next 3 years. The highest density of vegetative cover was recorded in the North - Western part of the study area of forest reclamation.
References
Alice, F., Montagnini, F., Montero, M., 2004. Productividad en plantaciones de especies nativas en La Estacio'n Biolo'gica La Selva, Sarapiqui', He-redia, Costa Rica. Agron. Costarricense 28 (2), 61-71.
Amichev, B.Y., Burger, J.A., Rodrigue, J.A., 2008. Carbon sequestration by forests and soils on mined land in the Midwestern and Appalachian coalfields of the U.S. For. Ecol. Manag. 256, 1949-1959.
Bouillet, J., Laclau, J., Goncalves, J.L.M., Voigtlaender, M., Gava, J.L., Leite, F.P., Hakamada, R., Mare-schal, L., Mabiala, A., Tardy, F., Levillain, J., Deleporte, P., Epron, D., Nouvellon, Y., 2013. Eucalyptus and Acacia tree growth over entire rotation in single- and mixed-species plantations across five sites in Brazil and Congo. Forest Ecol. Manage. 301, 89-101.
Caravaca, F., Hernandez, M.T., Garcia, C., and Roldan, A., 2002. Improvement of rhizosphere aggregates stability of afforested semi- arid, plant species subjected to mycorrhizal inoculation and compost addition. Geoderma 108, 133-144.
Carlson, T.N., Ripley, D.A., 1997. On the relation between NDVI, fractional vegetation cover, and leaf area index. Remote Sensing of Environment. Vol.62. No.3: 241-252.
Chatterjee, A., Lal, R., Shrestha, R.K., Ussiri, D.A.N., 2009. Soil carbon pools of reclaimed mine soils under grass and forest land uses. Land Degrad. Dev. 20, 300-307.
Chmielewski, S., Chmielewski, T. and Tompalski, P., 2014. Land cover and landscape diversity analysis in the West Polesie Biosphere Reserve. International Agrophysics, 28(2), 153-162. DOI: 10.2478/ in-tag-2014-0003.
Cleveland, B., Kjelgren, R. Establishment of six tree species on deep-tilled minesoil during reclamation. Forest Ecology and Management. Volume 68, Issues 2-3, October 1994, 273-280. https://doi. org/10.1016/0378-1127(94)90051-5.
Dudzinska-Nowak and W^zyk, 2013 Dudzinska-Nowak, J. and W^zyk, P., 2014. Volumetric changes of a soft cliff coast 2008-2012 based on DTM from airborne laser scanning (Wolin Island, southern Baltic Sea). Journal of Coastal Research 04/2014, 70(SI), 59-64. DOI: 10.2112/SI70-011.1.
Forrester, D. I., 2014. The spatial and temporal dynamics of species interactions in mixed-species forests: From pattern to process. Forest Ecology and Management 312, 282-292.
Kelty, M.J., 2006. The role of species mixtures in plantation forestry. Forest Ecol. Manage. 233, 195-204.
Lein, J., 2001. Evaluating the utility of land satellite information for strip mine reclamation monitoring and assessment. Papers and Proceedings of the Applied Geography Conferences, 24, 1-8.
Liang, J., Crowther, T. W., Picard, N., Wiser, S., Zhou, M., Alberti, G., ... and de-Miguel, S., 2016. Positive biodiversity-productivity relationship predominant in global forests. Science, 354(6309), aaf8957.
Likus-Cieslik, J., Pietrzykowski, M., 2017. Vegetation development and nutrients supply of trees in habitats with high sulfur concentration in reclaimed former sulfur mines Jeziórko (Southern Poland) Environ Sci Pollut Res Int. 2017; 24(25): 2055620566. doi: 10.1007/s11356-017-9638-5.
Maiti, K.K., Bandyopadhyay, J., Chakravarty, D., Das, S.,
Mondal, S., 2019. Geospatial analysis for the assessment of mine land reclamation area: a case study of Noamundi Block, Jharkhand. Spatial Information Research. 1-13. D0I:10.1007/ s41324-019-00270-4.
Mao, P., Tang, Q., Cao, B., Liu, J., Shao, H., Cao, Z., Hao, M., Zhu, Z. 2017. Eco - physiological adaptability in mixtures of Robinia pseudoacacia and Fraxi-nus velutina and coastal eco -engineering. Ecological Engineering 106109 -115http://dx.doi. org/10.1016/j.ecoleng.2017.05.021 0925.
Mendez, M.O., Maier, R.M., 2008. Phytostabilization of mine tailings in arid and semiarid environments-An emerging remediation technology. Environmental Health Perspectives 116 (3), 278-283.
Piotto, D., Montagnini, F., Ugalde, L., Kanninen, M., 2003. Growth and effects of thinning of mixed and pure plantations with native trees in humid tropical Costa Rica. For. Ecol. Manage. 177, 427-439.
Petit, B., Montagnini, F., 2004. Growth equations and rotation ages of ten native tree species in mixed and pure plantations in the humid neotropics. For. Ecol. Manage. 199, 243-257.
Petit, B., Montagnini, F., 2006. Growth in pure and mixed plantations of tree species used in reforesting rural areas of the humid region of Costa Rica, Central America. Forest Ecology and Management 233 338-343.
Piotto, D., Montagnini, F., Ugalde, L., Kanninen, M., 2003. Performance of forest plantations in small and medium-sized farms in the Atlantic lowlands of Costa Rica. For. Ecol. Manage. 175, 195-204.
Pretzsch, H., Bravo-Oviedo, A., 2016. Mixing of Scots pine (Pinus sylvestris L.) and European beech (Fagus sylvatica L.) enhances structural heterogeneity, and the effect increases with water availability. Forest Ecology and Management 373: 149-166. https://doi.org/10.1016/j.foreco.2016.04.043.
Pretzsch, H., 2014. Canopy space filling and tree crown morphology in mixed-species stands compared with monocultures. Forest Ecology and Management 327:251-264.
Pretzsch, H., del Rio, M., Ammer, C., Avdagic, A., Barbei-to, I., Bielak, K., ... & Fabrika, M., 2015. Growth and yield of mixed versus pure stands of Scots pine (Pinus sylvestris L.) and European beech (Fagus sylvatica L.) analysed along a productivity gradient through Europe. European Journal of Forest Research, 134(5), 927-947.
Sakhatsky, A.I., Stankevich, S.A., 2007. About possibilities of soil moisture estimation using satellite imagery optical bands for Ukraine territory. Reports of the NAS of Ukraine. No.11, 122-128.
Sarp, G., 2012. Determination of Vegetation Change Using Thematic Mapper Imagery in Af§in-Elbistan Lignite Basin; SE Turkey. Procedia Technology 1: 407-411.
Schaaf, W., Gast, M., Wilden, R., Huettl, R.F., 2000. Development of element cycles at post-mining sites.
1-st Intern. Conf. Soil of Urban, Industrial, Traffic and Mining Areas. University of Essen, Proceeding. Vol. 3, 1015-1021.
Shrestha, R.K., Lal, R., 2011. Changes in physical and chemical properties of soil after surface mining and reclamation. Geoderma 161, 168- 76.
Sobek, A., Skousen, J. G., Fisher, Jr. S. E., 2000. Chemical and physical properties of overburden and mine soils. In R.I. Barnhisel et al. Reclamation of drastically disturbed lands. Agron. Monogr. 41. ASA, CSSA, and Madison, WI. 77 - 104.
Sytnyk, S., Lovynska, V., Gritsan, Y., 2016. The analysis of the taxation structure Robinia Pseudoacacia l. stands in the forests within northern steppe, Ukraine Agriculture and Forestry, 62 (4): 153160. DOI: 10.17707. Agricult Forest. 62.4.18
Szostak, M., W^zyk, P.,Tompalski, P., 2014. Aerial Orthophoto and Airborne Laser Scanning as Monitoring Tools for Land Cover Dynamics: A Case Study from the Milicz Forest District (Poland). Pure and Applied Geophysics, 171(6), 857 - 866, DOI: 10.1007/s00024-013-0668-8
Szostak, M. and Nowicka, M., 2013. The use of geo-technologies for land use mapping on reclaimed areas. Archive of Photogrammetry, Photogrammetry, Cartography and Remote Sensing, Vol. 25, 203 -216.
Szostak M., W^zyk P., Hawrylo P., Pietrzykowski M., 2015. The analysis of spatial and temporal changes of land cover and land use in the reclaimed areas with the application of airborne orthophotomaps and LAND SAT images. Geodesy and cartography. Vol. 64, No 1, 75-86.
Townsend, P. A., Helmers, D. P., Kingdon, C. C., McNeil, B. E., de Beurs, K. M., and Eshleman, K. N. , 2009. Changes in the extent of surface mining and reclamation in the Central Appalachians detected using a 1976-2006 LANDSAT time series. Remote Sensing of Environment, 113(1).
Vallet, P., Perot, Th., 2016. Tree diversity effect on dominant height in temperate forest. Forest Ecology and Management 38: 106-114.
Vlachodimos, K, Papatheodorou, E.M., Diamantopoulos, J., Monokrousos, N., 2013. Assessment of Robinia pseudoacacia cultivations as a restoration strategy for reclaimed mine spoil heaps. Environ. Monit. Assess. ; 185(8):6921- 6932. doi: 10.1007/ s10661-013-3075-9.
W^zyk, P., Krzaklewski W., Wójcik J., 2014. Die 2D und 3D-Strukturen der Flora in der rekultievierten Gebieten anhand der Leserbefl iegungen erfassten Punktenwolken. In: Cala M., von Bismarck F., Illing M. (Ed.): Geotechnische und Umweltaspekte bei der Rekultivierung und Revitalisierung von Bergbaufolgelandschaften in Polen und in Deutschland. Kraków, Wydawnictwa AGH, s. 108-123, 339-353 (In German)
Yuan, Y, Zhaoa, Z., Niua S., Lia, X, Wanga, Y., Bai, Z., 2018. Reclamation promotes the succession of the
soil and vegetation in opencast coal mine: A case study from Robinia pseudoacacia reclaimed forests, Pingshuo mine, China, Catena 165: 72-79. https://doi.org//10.1016/j.catena.2018.01.025
Zeller, L., 2016. Tree ring width and wood density in mixed versus pure stands of Scots pine and European beech, Master Thesis, MWW-MA 223, TUM, School of Forest Sciences and Resource Management, 39.
Zhang D., Zhou, G., 2016. Estimation of soil moisture from optical and thermal remote sensing: A review. Sensors. Vol.16. No.8. A.1308.29.
Zhang, X., Yan, G., Li, Q., Li, Z.-L., Wan, H., Guo, Z., 2006. Evaluating the fraction of vegetation cover based on NDVI spatial scale correction model. International Journal of Remote Sensing. Vol. 27. No.24: 5359-5372.
Zhao, Z.Q.,Shahrour, I., Bai, Z.K., Fan,W.H., Feng, L.R., Li, H.F., 2013. Soilsdevelopment in opencast coal mine spoils reclaimed for 1-13years in the West-Northern Loess Plateau of China. Eur. J. Soil Biol. 55, 40-46.
Zhao, Z.Q., Wang, H.Q., Bai, Z.K., Pan, Z.G., Wang, Y., 2015. Development of population structure and spatial distribution patterns of a restored forest during 17-year succession (1993-2010) in Pingshuo opencast mine spoil, China. Environ. Monit. Assess. 187, 1-13.
Zipper, C. E., 2000. Coal main reclamation, acid mine drainage, and the Clean Water Act. In R.I. Barnhisel et al. Reclamation of drastically disturbed lands. Agron. Monogr. 41. ASA, CSSA, and Madison, WI. 169-192.
