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Benefit assessment of soil and water conservation from cropland to forest in hilly Loess Plateau at Qinghai

机译：青海黄土高原丘陵区退耕还林还水效益评价。

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摘要

The information of slope and vegetation coverage of the monitoring region were extracted, based on DEM (Digital Evaluation Model) and Spot5 Satellite data images, and fishnet grid was generated using GIS (Geographic Information System) and RS (Remote Sensing) technique. Applying the information of slop and vegetation coverage layers into the corresponding space grid by using the function of zonal statistics and analysis, it can realize overlay analysis based on Standards for Classification and Gradation of Soil Erosion (SL190-2007), and obtains the map of soil erosion intensity of the monitoring region. Finally, according to Specifications for Assessment of Forest Ecosystem Services (LY/T1721-2008) and monitoring data of typical plot, the soil and water conservation value from cropland to forest was evaluated quantitatively in 2009. The results showed that the area, on and below the moderate level, was 93600 ha, taking up 50.03% of total conversion of farmland to forest area (185100 ha), which indicates a 14.64 million (t/a) of soil conversion, and a 1520 million Yuan for erosion control. The results of the study showed that the soil and water conservation was very effective.
机译：基于DEM（数字评估模型）和Spot5卫星数据图像，提取监测区域的坡度和植被覆盖度信息，并使用GIS（地理信息系统）和RS（遥感）技术生成鱼网网格。利用区域统计和分析功能，将坡面和植被覆盖层的信息应用到相应的空间网格中，可以根据《土壤侵蚀分类和分级标准》（SL190-2007）实现覆盖分析，并获得监测区土壤侵蚀强度。最后，根据《森林生态系统服务评估规范》（LY / T1721-2008）和典型样地的监测数据，2009年对农田到森林的水土保持价值进行了定量评估。中等水平以下为93600公顷，占耕地总转化面积（185100公顷）的50.03％，这表示土壤转化为1464万吨（t / a），侵蚀控制为15.2亿元。研究结果表明，水土保持非常有效。

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