门头沟生态系统土壤保持功能及其生态经济价值分析

Study on the Assessment of Soil Conservation Service and Its Eco-Economic Value of Ecosystem in Mentougou

在遥感和地理信息系统的支持下,利用通用土壤流失方程(USLE)和风力侵蚀模型,研究了门头沟生态系统土壤保持能力,并评价了其生态经济价值.结果表明:门头沟生态系统每年可以减少土壤的水蚀量为14.93×104t/a,风蚀量为2 254.38×104t/a;土壤保持能力在空间上呈现很大的差异性,总体上植被覆盖度高且坡度小的地区土壤保持能力最强,而植被覆盖度低且坡度较大的山地土壤保持能力最弱.土壤保持功能总价值为58 198.83×104元/a,其中减少水蚀功能价值为442.83×104元/a,减少风蚀功能价值为57 756×104元/a.

Using the Universal Soil Loss Equation （USLE） and Wind Erosion Model, the soil conservation ability and its eco-economic value of Mentougou area were assessed, with the support of RS and GIS. The results show that the amount of soil water erosion conservation is 14.93 × 10^4 t/a and soil wind erosion conservation due to the ecosystem is 2 254.38× 10^4 t/a in Mentougou; the spatial difference of soil conservation ability is huge; the soil conservation ability is highest in the high vegetation fraction and low slope, but the ability is very weak in the region of high slope and low vegetation; the total value of the soil conservation service is 58 198.83 ×10^4 yuarda, in which the value of soil watererosion conservation is 442.83 ×10^4 yuan/a and the value of soil wind erosion conservation is 57 756 × 10^4 yuan/a.