长江中游地区生态系统服务价值空间分异 及敏感性分析.

The continuous degradation of ecosystem services is a common challenge facing human-beings, and it is the focus of global sustainable development research. The ecological environmental protection in the Middle Yangtze River region is of great significance to the construction of ecological security pattern in China. In order to deeply analyze the interference degree of land use activities to ecosystem services value (ESV) in the Middle Yangtze River region, it is necessary to evaluate the spatial-temporal distribution of ESV and the sensitivity of ecosystem services to land use change in the study region. Based on the evaluation results of ESV in the Middle Yangtze River region, this paper constructed the ecological contribution model of land use change and ecosystem services sensitivity model. The results showed that: (1) The average ecosystem service value (AESV) in this region in the years of 1995, 2005 and 2015 was 46244.29 yuan/hm2, 46484.08 yuan/hm2, and 46249.254 yuan/hm2, respectively, and the study region experienced a "first increase and then decrease" change process. The counties with higher AESV were mainly located in the mountainous areas; plain areas, urban agglomeration areas, Wuhan, Changsha, and Nanchang, and major traffic routes tended to have lower AESV; the ESV change rate presented a spatial pattern of "two horizontal and three vertical" distribution. (2) The conversion of cultivated land to forest land and cultivated land to water areas during 1995-2015 were the key factors for the improvement of regional ESV, and their ecological contribution degrees were 33.34% and 32.99%, respectively; forest land converted to cultivated land, forest land converted to construction land and cultivated land converted to construction land were important causes that induced the deterioration of the regional ecological environmental quality, and their ecological contribution degrees were 36.21%, 20.26% and 11.98%, respectively. (3) The ecosystem services sensitivity areas were mainly distributed in areas with frequent human activities, 1% increase in the integrated land use dynamics would result in 0.18% and 0.15% fluctuation in ESV in the Middle Yangtze River region during the periods of 1995- 2005 and 2005-2015, respectively; the ecological sensitivity of food production, raw material production, gas regulation, soil conservation and maintenance of biological diversity increased, and the sensitivity of other ecosystem function gradually weakened during the two study periods. The results of this study can provide scientific implications for the ecological environmental protection and the continuous supply of various sub- functions of the ecosystem services in the Middle Yangtze River region. [ABSTRACT FROM AUTHOR]