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三门河流域在治理前,植被破坏严重,水土资源大量流失,农田跑水、跑土、跑肥,耕层越来越薄,地力减退,抗旱能力越来越低;河床抬高,出现大面积落河田;河床大量淤积,效益降低。治理措施:一是调整林业结构和布局,扩大植被面积;二是坚持陡坡地退耕还林还牧,严禁开荒;三是利用低山缓坡优势,发展经济林,提高商品生产率。治理结果,森林覆盖率从38%提高到56.5%;活立木蓄积量由1.8万立方米增加到5.9万立方米,增长3.3倍;净效益620.8万元。累积产投比17.22。
Sanmen River Basin before the management of vegetation damage was serious, a lot of water and land loss, farmland running water, run the soil, run fertilizer, plowing thinner, reduced fertility, drought resistance is getting lower and lower; Lack of Hetian area; a large number of siltation river, reduce efficiency. The first is to adjust the structure and layout of forestry and expand the area of vegetation; the second is to uphold the steep slopes of returning farmland to forests and grazing, forbidding wasteland; the third is to use the advantage of low hills and gentle slopes to develop economic forests and improve the productivity of commodities. As a result, the forest coverage rate increased from 38% to 56.5%; the stock volume of living wood increased from 18,000 cubic meters to 59,000 cubic meters, an increase of 3.3 times; and the net benefit was 6,208,000 yuan. Accumulated production to investment ratio of 17.22.