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Land Cover Dynamics of Oleshky Sands: Time-Series Analysis 1987-2017

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Land Cover Dynamics of Oleshky Sands: Time-Series Analysis 1987-2017 Моніторинг та охорона земель UDC 911.5 + 631.6 (528.46) LAND COVER DYNAMICS OF OLESHKY SANDS: TIME-SERIES ANALYSIS 1987-2017 V. Bogdanets, Assoc. Prof., Cand. Agr. Sci. Email: [email protected] Oleshky Sands is the largest expanse of sand in Ukraine and the second in Europe. In the beginning of XX century sands moving outside of arenas was almost stopped by planting trees (Pinus nigra ssp. pallasian and Pinus sylvestris L.), and the territory had different use during the years. A 30-year (1987-2017) time series of Landsat imagery obtained via USGS geoservice was used to reveal land cover dynamics of deserted landscapes of Oleshky sands using QGIS software. Heavy sand storms can impact nearby settlements and expose harmful effect on local industry and quality of life of local communities. Forest fire is another dangerous factor for protective forest plantations during last years. Our estimation shows that sandy areas increase during 2000-2017; generally, conservation measures had constant effect despite afforestation of last years. The preventive effect of forest on sands moving at Oleshky sands can be characterized as stable in case of constant care about the forest plantation and proper documentation on land use and ownership. Keywords. Combating desertification, landscapes dynamics, land cover change, QGIS, Landsat imagery Introduction. State natural reserve “Oleshky sands” was created in 2010 with total Oleshky Sands is the largest expanse area of 8020.36 ha, it is a nature conser- of sand in our country and the second in vation, recreation, cultural, educational Europe after Ryn desert in Western Ka- and research institution of national im- zakhstan and Kalmykia. Its area estimat- portance and a part of the nature reserve ed as 161.2 sq. km, main part is about 15 fund of Ukraine [4]. km in diameter [1]. It is situated in inland In XX century moving sands appear Ukraine in Kherson region near the mouth a great danger to local settlements and of Dnipro river and coast of Black Sea agriculture, then this was limited by (fig.1) and consists of dunes of sand up to planting a massive of trees (mainly Pi- five meter height. It is classified as semi- nus nigra ssp. pallasian, and Pinus syl- desert region according to temperature vestris L.) around sandy arenas. Now and moisture regime [2]. A lot of sparse territory is surrounded (mainly on the vegetation is located across these sands, south) by dense forest planted to pre- at spring even some wetland and swamp vent dunes moving. In summer this area can occur. At summer air temperature forest often catches fire as can be seen rises to 40°C and more. from satellite imagery. Underground № 4’2017 71 Землеустрій, кадастр і моніторинг земель there are no evidence of desert before 1800s in historical documents. In XX century this place was used as military polygon [5]. Aim of research — by com- parison of 30-year time series of Landsat data on research territory analyze trends in land cover change and reveal drivers of such changes. Methods and materials. Fig.1. Location of research territory. USGS data from Landsat-5 and water reserve forms an important part Landsat-8 were used to build time se- of all local environment as a source of ries for research object, main images of fresh water [5]. series were: 04 October 1987, 18 Sep- There are different hypotheses of rea- tember 1993, 12 September 2000, 15 son why this territory became a semi-des- September 2006, 20 September 2011, ert: massive geological events of ice age, and LT8 for 30 September 2017, as meteorite crater, drying of old Dnipro cloud percentage was less than 10% in riverbed, but the most common is that it these dates. This season was chosen due was a great pasture for more than a mil- to relative perennial stability of land- lion sheep in 18-19 centuries, then forest scapes and low danger of forest fires. fires, wind erosion made a semidesert QGIS 2.18 and GDAL tools were used here on eolian and alluvial sands as a to process image data. Public cadastral good geological precondition. Anyway, map of Ukraine using QuickMapSer- Fig.2. Oleshky sands on the Public cadastral map of Ukraine [6]. 72 № 4’2017 Моніторинг та охорона земель Fig. 3. Major land cover changes for period 1987-1993. vices plugin in QGIS was used to access area to the east of 468 ha are of state information about cadastral plots in re- property, smaller ones show parcels of search object. private property in a very close proxim- ity to moving sands (fig.2). Results and discussion. A time-series of Landsat images al- lows us to form a picture of land cov- One of main tasks of our research er changes of the research area for 30 was to assess land ownership and cur- years. Main changes were connected to rent land use. Public cadastral map of increase of sandy areas. The 30-year pe- Ukraine [6] shows that state property on riod was divided for shorter, which dis- land of national reserve is not formed play major changes (fig.3, 4). properly as the whole territory. The cen- As main change for period 1987- tral plot of 5378.6087 ha and smaller 1993, it can be admitted that reservoirs Fig. 4. Major land cover changes for period 2000-2017. № 4’2017 73 Землеустрій, кадастр і моніторинг земель for fishery at the north-east part was ful- preventive effect of forest on sands mov- ly filled (fig.3, shown by arrow), while ing at Oleshky sands can be characterized sands were almost constant by area; as stable in case of constant care about the main reason – balanced land and water forest plantation. That is impossible with- management. out connection with proper formed rights Next 17-years period shows expan- for state land use. sion of sand on the north-eastern and Next stage of our research will in- south-western sides of the arena (fig.4, clude detailed quantitative and quali- shown by arrows). Comparing to 2006, tative estimation of landscape changes on 2011 image a medium sized sand and improved range of data time-series. massive appeared (shown by arrow). This period shows evidence of decreas- ing forest and big sand storms in the References south-western part in 2016-2017 (shown 1. Network of the European Dry Grass- by arrows), where forest protection ef- land Group. “Bull. Eur. Dry Grassl. fect was not strong enough supposedly Group, No 8., 2010. URL http://d-nb. due to poor state of control [3]. info/1010626833/34/ On our opinion, the main reasons for 2. Fehmi, J. S., Niu, G. Y., Scott, R. L., Mathias, imbalance of landscapes for this period A. Evaluating the effect of rainfall variability are: improper land management, forest on vegetation establishment in a semidesert fires and lost of good care of forest plan- grassland. Environmental monitoring and tations around the sand arena. assessment, 186, Vol.1, 2014. - P. 395-406. Further research needed to show devel- 3. Malchykova, D., A. Ponomareva, R. Mo- opment of processes of landscape change likevych. “Environmental protection and and a stabilized land use can be achieved spatial planning of eco-net strategies in in case of control of forest protection plan- regions with high level of anthropogenic tations around the sand arena. That is im- transformation of geosystems.” Scientific possible without connection with proper Journal of Kherson state university. Series: formed rights for state land use. Geography. Vol. 2, 2015. - P. 92-107. 4. National state reserve “Oleshky sands”. Of- Conclusions. ficial site URL https://nppop.gov.ua/ 5. Oleshky Sands. Wikipedia. URL: https:// A 30-year (1987-2017) time series of en.wikipedia.org/wiki/Oleshky_Sands Landsat imagery obtained via USGS geo- 6. Public Cadastral Map of Ukraine. URL service was used to reveal land cover dy- http://map.land.gov.ua/kadastrova-karta namics of deserted landscapes of Oleshky [for 27 October 2017]. sands using QGIS software. Heavy sand storms can impact nearby settlements and expose harmful effect on local industry *** and quality of life of local communities. Богданець В.А., Forest fire is another dangerous factor for ДИНАМІКА ЗЕМЛЕКОРИСТУВАННЯ protective forest plantations during last ОЛЕШКІВСЬКИХ ПІСКІВ: АНАЛІЗ ЧАСО- years. Our estimation shows that sandy ВОГО РЯДУ 1987-2017 РР. areas increase during 2000-2017; general- Олешківські піски — найбільший пі- ly, conservation measures had constant ef- щаний масив України, друга за розмірами fect despite afforestation of last years. The пустеля Європи. На початку 20 століття 74 № 4’2017 Моніторинг та охорона земель рухомі піски, які спричиняли значні збитки Олешковские пески - самый большой місцевого населення та промисловості, песчаный массив Украины, вторая по ве- були практично зупинені лісозахисними личине пустыня Европы. В начале 20 века насадженнями Сосни кримської та Сосни подвижные пески, которые вызывали зна- звичайної, територія у ці роки використо- чительные убытки местного населения и вувалася за різноманітним призначенням. промышленности, были практически оста- 30-річний ряд (1987-2017) супутникових новлены лесозащитными насаждениями знімків Ландсат, отриманих із сервісів Сосны крымской и сосны обыкновенной, тер- USGS, використовувався нами у програмі ритория в эти годы использовалась по раз- QGIS для відстеження динаміки опустеле- нообразным назначением. 30-летний ряд них ландшафтів. Сильні піщані бурі та лісо- (1987-2017) спутниковых снимков Ландсат, ві пожежі і зараз можуть чинити значний полученных из сервисов USGS, использовал- вплив на місцеву промисловість та сусідні ся нами в программе QGIS для отслежива- поселення. За нашими оцінками, у період ния динамики опустыненных ландшафтов. 2000-2017рр. площі піщаних земель зросли, Сильные песчаные бури и лесные пожары хоча загалом лісові насадження мали ста- и сейчас могут оказывать значительное більний ефект незважаючи на зменшення влияние на местную промышленность и со- площі лісів останні роки.
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