Sichuan is located at the upper stream of Yangtze River with remarkable advantages of resource, sci-tech and market.
四川地处长江上游,资源优势、科技优势、市场优势明显。
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.
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。
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