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土壤保持是生态系统服务与功能的重要组成,在防止土壤侵蚀、减少径流泥沙与农业面源污染等方面具有至关重要的作用。以对国家生态安全具有重要作用的土壤保持生态功能区——三峡库区重庆段为研究区域,研究得到了2000~2013年时间序列区域土壤保持服务“流量”结果,结果表明:(1)三峡库区重庆段多年平均土壤保持量为604.39 t/hm~2·a,沿长江干流自西向东逐渐增强,区域差异显著;(2)三峡库区的土壤保持服务存在明显的垂直分异特征,随着高程的增加,以300 m与900 m为节点,出现递减-递增-递减的分段规律,与人类活动存在明显的相关关系;(3)增加森林覆被面积是改善区域土壤保持、减少水土流失的重要举措。同时,在三峡库区开展坡改梯工程,减少坡耕地的数量能够有效控制区域水土流失;
Soil conservation is an important component of ecosystem services and functions and plays a crucial role in preventing soil erosion, reducing runoff and sediment, and agricultural non-point source pollution. Taking the Chongqing section of the Three Gorges Reservoir, a soil conservation ecological function area that plays an important role in the national ecological security, as the research area, the results of the soil maintenance service “flow rate ” in the time series from 2000 to 2013 were obtained. The results show that: (1 ) The multi-year average soil conservation in the Chongqing section of the Three Gorges Reservoir Area was 604.39 t / hm ~ 2 · a, which gradually increased along the mainstream of the Yangtze River from west to east, with significant regional differences; (2) There was a significant vertical difference in soil conservation services (3) Increasing the area of forest cover is the key to improving the soil conservation in the region , An important measure to reduce soil erosion. At the same time, carrying out the project of slope to ladder improvement in the Three Gorges reservoir area and reducing the amount of slope farmland can effectively control the water and soil loss in the area;