Karst rock-desertification of extracting vegetation coverage inversion based on NDVI serial images and dimidiate pixel model: a case study of the Yachi demonstration area in Bijie city of Guizhou

2011 ◽  
Author(s):  
Hui Zhang ◽  
Zhongfa Zhou ◽  
Jun Xie
Keyword(s):  
Vegetation Coverage ◽  
Dimidiate Pixel Model ◽  
Serial Images ◽  
Rock Desertification

scholarly journals Ecosystem Services and Their Relationships in the Grain-for-Green Programme—A Case Study of Duolun County in Inner Mongolia, China

2018 ◽  
Vol 10 (11) ◽  
pp. 4036 ◽  
Author(s):  
Dongliang Dang ◽  
Xiaobing Li ◽  
Shengkun Li ◽  
Huashun Dou
Keyword(s):  
Ecosystem Services ◽  
Soil Conservation ◽  
Net Primary Production ◽  
Ecological Environment ◽  
Vegetation Coverage ◽  
Water Yield ◽  
Grassland Restoration ◽  
Ecological Health ◽  
Grain For Green

Grassland restoration projects are currently being implemented to mitigate human disturbance to the natural environment and reduce grassland degradation. China’s Grain-for-Green Programme (GFGP), including one project implemented in Duolun County, China, in 2000, has significantly improved the overall ecological health of this region. Using a modeling approach, this study quantified changes in four ecosystem services (ESs), including Net Primary Production (NPP), soil conservation (SC), water yield (WY), and sandstorm prevention (SP), in Duolun County between 2000 and 2016. We found the total NPP, water yield, and soil conservation increased by 80.44%, 248.2%, and 12.2%, respectively, during this period, while the sandstorm prevention decreased by 55.9%. Unlike other areas of GFGP implementation, the improvement of the ecological environment in Duolun County is largely attributed to the increased of vegetation coverage (88%) instead of land use circulation (12%). We found the grassland is a factor that reduces the trade-off while this effect was related with the grassland coverage. Future policies should be based on the mechanisms of vegetation underlying the ESs change and the relationships of ESs in order to achieve sustainable provision of ESs.

scholarly journals Runoff sensitivity to climate and land-use changes: A case study in the Longtan basin, Southwestern China

2020 ◽  
Author(s):  
Guiyan Mo ◽  
Ya Huang ◽  
Qing Yang ◽  
Dayang Wang ◽  
Chongxun Mo
Keyword(s):  
Land Use ◽  
Water Conservation ◽  
Assessment Tool ◽  
Land Use Changes ◽  
Annual Runoff ◽  
Vegetation Coverage ◽  
Average Annual Runoff ◽  
Annual Evaporation ◽  
Water Assessment

Abstract Based on the scenario hypothesis method, this paper applied a Soil and Water Assessment Tool (SWAT) to analyze the sensitivity of runoff to climate and land-use changes in the Longtan basin, China. Results indicated that (1) for every 1 °C increase in temperature, the average annual runoff decreased by 9.9 mm, and the average annual evaporation increased by 9.3 mm. However, for every 10% increase in rainfall, the average annual runoff and evapotranspiration increased by 96.3 mm and 11.53 mm, respectively. Obviously, runoff was more sensitive to the change in rainfall than temperature in the Longtan basin. Meanwhile, (2) forestland could conserve water resources, but its water consumption was larger. Although grassland played a relatively small role in water conservation, it consumed less water. At the same time, increasing the area of forestland and grassland could weaken peak floods, and the water retention function of vegetation could prevent runoff from increasing and decreasing steeply. Therefore, it is worth improving vegetation coverage.

scholarly journals Green space trends in small towns of Kyiv region according to EOS Land Viewer – a case study.

2020 ◽  
Vol 66 (No. 6) ◽  
pp. 252-263
Author(s):  
Vasyl Yukhnovskyi ◽  
Olha Zibtseva
Keyword(s):  
Vegetation Index ◽  
Green Space ◽  
Small Towns ◽  
Vegetation Coverage ◽  
Anthropogenic Activity ◽  
Urban Greening ◽  
Ecological Balance ◽  
Current State ◽  
Vegetative Indices

The state of ecological balance of cities is determined by the analysis of the qualitative composition of green space. The lack of green space inventory in small towns in the Kyiv region has prompted the use of express analysis provided by the EOS Land Viewer platform, which allows obtaining an instantaneous distribution of the urban and suburban territories by a number of vegetative indices and in recent years – by scene classification. The purpose of the study is to determine the current state and dynamics of the ratio of vegetation and built-up cover of the territories of small towns in Kyiv region with establishing the rating of towns by eco-balance of territories. The distribution of the territory of small towns by the most common vegetation index NDVI, as well as by SAVI, which is more suitable for areas with vegetation coverage of less than 30%, has been monitored. We found that the share of dense vegetation in the territory of towns increased on average from 2.4 to 49.3% during 1990–2018. The share of the vegetation cover of moderate density decreased from 40.8 to 27.1%, and of sparse one from 37.5 to 14.9%. High variability of these indicators is noted. The share of open area for small towns decreased on average from 15.4 to 3.8%. The vegetation-free areas in 1990, 2005 and 2018 accounted for 3.8, 2.6 and 4.4%, respectively, which may indicate the intensive expansion of built-up areas over the last fifteen years. The development of urban greening systems was completely individual and depended not only on natural conditions but also on the manifestations of anthropogenic activity. The reduction of the ecological balance of the territories of small towns as of 2018 took place in the following sequence – Irpin, Tarashcha, Boiarka, Rzhyshchiv, Kaharlyk, Skvyra, Myronivka, Yahotyn, Uzyn.

Vegetation Fraction Change Monitoring in Beijing by Remote Sensing

2014 ◽  
Vol 955-959 ◽  
pp. 859-862
Author(s):  
Shi Wei Dong ◽  
Dan Feng Sun ◽  
Hong Li
Keyword(s):  
Remote Sensing ◽  
Land Surface ◽  
Vegetation Coverage ◽  
Vegetation Fraction ◽  
Important Index ◽  
Dimidiate Pixel Model ◽  
Low Coverage ◽  
Beijing China ◽  
Change Monitoring ◽  
Better Than

Vegetation fraction was a most important index to score the vegetation coverage on the land surface. Improved dimidiate pixel model was applied to calculate and analyze the vegetation fraction change from September 2000 to September 2013 in Beijing, China. The results showed that vegetation coverage of Beijing in 2013 year was much better than 2000 year. The area of low and middle-low coverage of Beijing in 2013 decreased 379 km2 and 591 km2 respectively, and the area of high and middle coverage increased 885 km2 and 85 km2 respectively. The research provided a necessary reference for the related researches of vegetation fraction.

Using classification and NDVI differencing methods for monitoring sparse vegetation coverage: a case study of saltcedar in Nevada, USA

2008 ◽  
Vol 29 (14) ◽  
pp. 3987-4011 ◽  
Author(s):  
Ruiliang Pu ◽  
Peng Gong ◽  
Yong Tian ◽  
Xin Miao ◽  
Raymond I. Carruthers ◽  
...  
Keyword(s):  
Vegetation Coverage ◽  
Sparse Vegetation ◽  
Ndvi Differencing

Dynamic Monitoring of Vegetation Coverage in Daliuta Mine Based on ENVI and GIS Technology

2014 ◽  
Vol 1010-1012 ◽  
pp. 377-380
Author(s):  
Zhi Yong Qiao ◽  
Dong Wen Liu ◽  
Ting Ting Wei ◽  
Shu Jiang ◽  
Ya Kai Chen ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Theoretical Basis ◽  
Remote Sensing Data ◽  
Dynamic Monitoring ◽  
Ecological Environment ◽  
Vegetation Coverage ◽  
Gis Technology ◽  
Dynamic Variation ◽  
Dimidiate Pixel Model ◽  
Ecological Reconstruction

Researching dynamic variation of vegetation coverage has positive significance for vegetation restoration and ecological reconstruction. Landsat TM/ETM+ remote sensing data of the 2002, 2005, 2007, 2009 and 2011 was analyzed by ENVI and GIS technology, divided the vegetation coverage into 6 grades based on dimidiate pixel model, concluded the variation of ecological environment based on transfer matrix method, taked the Daliuta Mine as a case. The results indicated that average vegetation coverage in Daliuta Mine has increased integrally, and vegetation coverage changed from low, medium low and medium to medium and medium high, the vegetation coverage has somewhat. The dynamic monitoring of vegetation coverage can effectively reflect the variation of ecological environment in Daliuta Mine. This study provided a theoretical basis for the ecological reconstruction and sustainable development of Daliuta Mine.

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