Abstract
With global warming and increased human activity, more and more ground surface areas have been affected, which leads to the creation of many problems. To understand the ecological environment changes in a typical alpine region, information on landcovers changes in the study area from 2000 to 2020 was obtained by combining remote sensing, geographic information system, and traditional statistical analysis for the Sanjiangyuan National Nature Reserve on the Qinghai-Tibet Plateau, China. The results show that the changes of surface cover in Sanjiangyuan National Nature Reserve are relatively concentrated, mainly distributed in the sections of south, northwest, central, and northeast, with the area of the changed regions and the unchanged regions being 31,127.45 km2 and 271,941.37 km2, respectively. The transformation between the various types of ground landcover is mainly characterized by a shift from other types to grassland and from grassland to bare land. And the regions of change are mostly concentrated between 3500 - 4600 m in elevation.
Highlights
IntroductionS. Du cold geographical characteristics, creating a distinctive climate and a harsh ecological environment in the region
The results show that the changes of surface cover in Sanjiangyuan National Nature Reserve are relatively concentrated, mainly distributed in the sections of south, northwest, central, and northeast, with the area of the changed regions and the unchanged regions being 31,127.45 km2 and 271,941.37 km2, respectively
Combined with the DEM of the study area (Figure 1(b)), it can be seen that the areas of surface cover change in the study area are mainly concentrated in the area between 3500 - 4600 m above sea level, and the areas at lower altitudes (5000 m) have little change in surface cover and are relatively stable
Summary
S. Du cold geographical characteristics, creating a distinctive climate and a harsh ecological environment in the region. The deterioration of the ecological environment on QTP will directly or indirectly affect habitat changes in the surrounding areas and even in other regions of the globe, and requires more attention and research. The Sanjiangyuan National Nature Reserve (SNNR), the largest nature reserve in China, is located in the hinterland of QTP, named from the birthplace of the Yangtze, Yellow, and Lancang Rivers, and it is an important ecological barrier and water-conserving area for China and Asia (Wu et al, 2021). This paper combines remote sensing (RS), geographic information system (GIS), and other technologies (Du et al, 2020) to obtain data on the ecological environment and human and other elements of SNNR, and studies the ecological environment changes in the study area through spatial analysis and statistical analysis methods. Information on land cover changes in the study area from 2000 to 2020 was analyzed using a 2-phase land cover dataset to understand the ecological and environmental change characteristics of SNNR
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