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根据大杨树地区两次森林资源调查结果 ,论述了该地区林地水源调节能力下降的原因 ,并提出了相应的改进措施
According to the results of two surveys of forest resources in Dayangshu area, the reasons for the decrease of water regulating capacity in forestlands in this area are discussed, and the corresponding improvement measures are put forward