Spatial-temporal dynamics of ecological carrying capacity of the northeastern margin of the Ulan Buh Desert
QI Zhao1,2(), TAN Bingxiang1,2(), CAO Xiaoming3, YU Hang1,2, SHEN Mingtan1,2
1. Research Institute of Forest Resources Information Techniques, Chinese Academy of Forestry, Beijing 100091, China 2. Key Laboratory of Forestry Remote Sensing and Information System, NFGA, Beijing 100091, China 3. Research Institute of Desertification Studies, Chinese Academy of Forestry, Beijing 100091, China
Ecological carrying capacity is an important indicator used to measure the stability of an ecosystem. The spatial-temporal change analysis of the ecological carrying capacity can help understand the changing trend of a regional ecological environment and serve as a comprehensive reference for the evaluation of ecological management and restoration, research on the overall sustainable development of an environment, and the optimization of land resources. Targeting the arid and semi-arid regions at the northeastern margin of the Ulan Buh Desert, this study constructed a comprehensive index evaluation system of ecological carrying capacity based on the actual ecological conditions of the regions and Landsat remote sensing images as the data source. Then, this study determined the spatial-temporal distribution and evolution pattern of regional ecological carrying capacity and made a driver analysis of the change in the ecological carrying capacity from the angles of rainfall, temperature, and land use changes. The results show that the ecological carrying capacity of the northeastern margin of the Ulan Buh Desert showed a first decreasing and then increasing trend from 1990 to 2020. The irrigated areas north of the Yellow River continued to expand to the desertification areas in the southwest. As a result, the percentage of the area with relatively high ecological carrying capacity increased greatly, while the area with high ecological carrying capacity decreased. The change in the ecological carrying capacity of the irrigated areas was mainly affected by land development and utilization, followed by temperature and rainfall. In contrast, the ecological carrying capacity of the desertification areas south of the Yellow River was mainly at a moderate level, which was shifted to a low level in large areas before 2010 and was restored to a moderate level in 2020. The change in the ecological carrying capacity of the desertification areas was greatly affected by temperature, followed by rainfall and changes in shrub and grass vegetation cover.
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2023, Vol. 35 
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