Future in Forest and Potentiality in Mountain—benefits of the Biological Measures for the Soil and Water Conservation in Sanmen River Watershed

27 Mar Future in Forest and Potentiality in Mountain—benefits of the Biological Measures for the Soil and Water Conservation in Sanmen River Watershed

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Abstract

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。

English Abstract

Before harnessing the Sanmeng River watershed is characterized withvegetation damaged, a large amount of soil and water lost, the farmlandlost of water, soil and fertility, tillage layer becoming thinner and thinner, productivity gone down and lower ability to fight against drought.Also, river bed is raised and deposited greatly, large area of lower lyingfield created, which reduce the benefits. The harness measures adopted are as these: 1、to regulate the structure and distrbution of forestry,to expand vegetation; 2、to persist in the steep land returned from tillage to forest and husbandry, and reclamation not to be permitted; 3、to develop economic forest for the increase of commodity products based on the superiority of the lower hill or gentle slope. The result is that the cover rate of forest is increased from 38% to 56.5%, the cubic meter amount stored of the standing trees from 18,000m3 to 59,00 m3,being2.3 tims in increase,the net income from them is 6.21 million yuan, andaccumulated ratio of output to input 17.22.