利用该系统对密云水库上游密云县境内水源保护林的水源涵养与防止土壤侵蚀效益进行了定量评价。

A quantitative evaluation of beneficial result in conserving water and protecting soil erosion of froest in the upper stream of Miyun reservoir is produced from the information system.

论文以密云县石匣小流域近10年水土流失综合治理的数据为基础，综合探讨了石匣小流域水土流失综合治理措施的结构和功能，分析了水保效益及经济效益。

The soil erosion comprehensive control measures have been put in practice for more than 10 years in Shixia small watershed, which gained remarkable ecosystem benefit and economic benefit.