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Monitoring interannual dynamics of desertification in minqin county,China,using dense Landsat time series

International Journal of Digital Earth 2020年第8期13卷 886-898页

作者： Xiaolin Zhu Kwok Huen Leung Wing Sze Li Lek Kin Cheung The Department of Land Surveying and Geo-Informatics The Hong Kong Polytechnic UniversityHong KongPeople’s Republic of China The Hong Kong Polytechnic University Shenzhen Research Institute ShenzhenPeople’s Republic of China

minqin county in northwestern China is highly affected by *** have been initiated in recent decades to combat desertification in *** assess the effectiveness of these campaigns,this study used a dense Landsat time series from 1987 to 2017 to investigate the interannual dynamics of vegetation coverage and greenness over the past 31 ***,this study applied an advanced technology to reconstruct a high-quality Landsat annual time ***,one image in the vegetation-peak season was selected as the base image in each year,and then problematic pixels were interpolated by the neighborhood similar pixel interpolator using ancillary images in the same ***,the land cover map and the enhanced vegetation index(EVI)were derived from all reconstructed ***,the change of vegetation coverage and EVI values over the 31 years were *** results show that the total vegetation coverage and greenness increased during the 31 *** this change trend to other factors suggests that vegetation in minqin county is highly affected by agriculture and groundwater supply rather than by *** mitigate desertification in a sustainable way,agriculture should be well managed to avoid overconsumption of natural resources such as underground water.

关键词： minqin county desertification agriculture Landsat time series vegetation cover

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Relative Ecological Value of Major Plants in minqin Desert Area

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Journal of Landscape Research 2015年第6期7卷 93-96页

作者： CHANG Zhaofeng MA Zhonghua DUAN Xiaofeng HAN Fugui YANG Ming Gansu Desert Control Research Institute Wuwei Meteorological Bureau

This paper analyzed relative ecological value of several major plants in minqin desert grassland using layered projection of plant canopy. The results showed that ecological functions of natural Nitraria tangutorum and Ephedra sinica woods of a unit area were much better than those of artifi cial Haloxylon ammodendron woods, relative ecological value of N. tangutorum, E. sinica and Artemisia desertorum were much higher than that of artifi cial H. ammodendron woods. Layered projection explains clearly the ecological functions and relative ecological value of desert vegetation of the same coverage. It is inaccurate to indicate wind prevention and sand fi xation of desert vegetation in deserts using ecological function service value and ecological niche calculated on the basis of two-dimensional vegetation coverage, but three-dimensional projection degree should be applied to indicate ecological functions and relative ecological value of vegetation. Application of layered projection of plants in calculating ecological functions and relative ecological value of desert plants(vegetation) is the innovation point of this research.

关键词： Desert steppe Layered projection degree Ecological function Relative ecological value minqin county

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