Soil Conservation Function Assessment Of Sanjiangyuan Ecosystem Based On InVEST Model

Ecosystem structure is significant basis of the function of soil conservation. Its function reflects the structure. It can help us to know the significance of the soil protection for regional ecosystem soil conservation services functions. The InVEST model based on GIS can be used to assess ecosystem services and applied in other countries It can provide us a large number of measured dates and references. The InVEST model had never been used to analyze the Sanjiangyuan soil conservation. In China, it only had been used in the mountainous regions of Beijing and Sichuan.In this paper, the function of soil conservation in Sanjiangyuan was studied. We attempt to comprehensively evaluate different types of ecosystem effects on soil conservation. In the first place, for the InVEST model, the data should be modified and processed. And then, the InVEST model was used to assess the ecosystem service of soil conservation in Sanjiangyuan region by analyzing the data, The integrated ecological system was assessed through the spatial analysis with ArcGIS. Ecological Compensation was revised for Sanjiangyuan region. The main conclusions of this study are as follows:(1) The InVEST model provides a simple and fast method for assessment of ecosystem Services. It is suitable for large-scale evaluation of ecosystem service function, because of its unit is based on years of simulation. It is different between the domestic and abroad, such as landform, climate and other factor. Therefore, it can be used in China after its parameters are modified.(2) Results show that the total of soil conservation is1.03×109t using the InVEST model, besides, the average is36.62t/(hm2-a). The areas with good soil conservation function are located in Xinghai-Maxin-Banma in eastern area, the southern areas located in the southeast of Yushu?Nangqian?the eastern of Zaduo are also good. It includes the woodlands moderate and low coverage in the function of soil conservation. The western and northern areas of the soil conservation functions are weak, such as Maxn?Chengduo?the northwest of Zhiduo and Tanggula.(3) Soil conservation influenced by Poverty population, human irrationality, intelligence investment, compensation area, the single of compensation and time factor. The mechanism of ecological compensation is:?Sustainable ecological environment?Strengthen the research of the factors which lead to soil erosion?Enhance the construction of intelligence?Plurality of compensation?Establish the mechanism of lasting effect.