论文部分内容阅读
浙江省缙云县近年来大力实行封山育林,森林覆盖率不断提高,森林的生态效益、经济效益越来越明显。 由于多种原因,缙云县的山地植被曾几经遭受破坏,水土流失严重。资料表明,1958年-1979年,境内的瓯江水系年平均侵蚀模数为247.8吨/平方公里。全县每年流失的泥沙达31.175万吨,相当于2250亩良好的耕地遭到彻底破坏,给农业、水利、渔业、林业等生产建设造成的损失难以估计。改革开放以来,缙云县开展了有规划有重点的封
In recent years, Jinyun County, Zhejiang Province, vigorously implement closed hillsides afforestation, increasing forest coverage, the ecological and economic benefits of forests, more and more obvious economic benefits. Due to many reasons, the mountainous vegetation of Jinyun County has been damaged several times, soil erosion is serious. Statistics show that from 1958 to 1979, the average annual Oujiang River erosion modulus of 247.8 tons / square kilometers. The annual loss of 318,175 tons of mud in the county, equivalent to 2,250 acres of good cultivated land has been completely destroyed, to agriculture, water conservancy, fisheries, forestry and other production losses caused by the construction is difficult to estimate. Since the reform and opening up, Jinyun County has carried out a planned and focused seal