Spatiotemporal Change of Landscape Biodiversity Based on InVEST Model and Remote Sensing Technology in the Bailong RiverWatershed
Xie Yuchu;Gong Jie;Zhang Suxin;Ma Xuecheng;Hu Baoqing;Key Laboratory of Environment Change and Resources Use in Beibu Gulf , Ministry of Education, Guangxi Teachers Education University;Key Laboratory of Western China's Environmental Systems, Ministry of Education, College of Earth and Environmental Sciences, Lanzhou University;Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture,Chinese Academy of Sciences;
Biodiversity is the material foundation and the environment guarantee that people are taken for their survival and development, and has four levels: molecular, species, ecosystem and landscape. The identification and understanding of the spatiotemporal variation of biodiversity in the landscape level are not just an important part of regional biodiversity monitoring and assessment, but also the first step in the formulation and implementation of the protection scheme. The Bailong River Watershed of the Gansu Province(BRWGP), one of the most abundant biodiversity regions in China, locating in the transitional ecotone along the Tibetan Plateau,Loess Plateau, and Qinba Mountains. The BRWGP served as a case to analyze the spatiotemporal heterogeneity of biodiversity. Based on the data integration analysis platforms of RS, GIS technology and In VEST 2.5.6,a comprehensive index system of biodiversity spatial patterns constructed with the incorporation of habitat quality, vegetation net primary productivity, and landscape state index by considering the difference of three assessment indicators intensity and influence degree. Meanwhile, AHP was used to determine the weights of index and GIS spatial technology apply to analyze the spatial distribution and differentiation of biodiversity under the landscape geography perspective. Our goal went to revise the biodiversity evaluation module of the InVEST model and demonstrate biodiversity spatial patterns on a grid cell. The results indicated that biodiversity was high and had obvious spatial pattern variations in the BRWGP. Areas with higher biodiversity mainly distribute in the national nature reserve and forest, while the relatively poor biodiversity areas distribute in the valleys of the BRWGP between Zhouqu-Wudu-Wenxian, the valley of Minjiang in Tanchang County, alpine mountain snow regions, and bare rock zones. Moderate biodiversity areas appeared in agroforestry ecosystem,shrub and grassland, which a vegetation cover, species richness and habitat quality were general. In1990-2010, biodiversity was high and increasing, the area proportion of higher biodiversity(critical areas) increased from 16.74% to 26.02%. Meanwhile, the high growth area of biodiversity change was concentrated in the ecological engineering zone and forest districts(Such as these forest districts of Duoer, Axia, the Minshan Mountain, Baishuijiang Nature Reserve), while biodiversity reduction area locates in the region of human activities intensively and frequently, such as cultivated area, urban and rural areas.
【Fund】： 广西自然科学基金(2016GXNSFBA380047);; 国家自然科学基金(41761039 41771196);; 广西师范学院博士科研启动经费项目(0819-2016L12)资助~~
【CateGory Index】： P901;Q16
【CateGory Index】： P901;Q16