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| Effect of eco-restoration for soil and water conservation in northwest plateau of Yunnan province in upper reaches of Jinsha river |
| Chen Qibo1, Cun Yukang2, Wang Limin1, Wang Keqin1, Liu Wensheng1, Cao Ziling1 |
| 1.Southwest Forestry College, 650224, Kunming;2.Office of Water nd Soil Conservation of Shangrila County, 674400, Shangrila: Yunnan, China |
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Abstract To investigate the effect of effect of eco-restoration for soil and water conservation in the northwest plateau of Yunnan province in upper reaches of Jinsha river, based on surveying vegetation community structure , analyzing soil chemical and physical properties, and observing runoff and soil loss in plots, effects of eco-restoration are researched. Results show that degraded eco-systems formed by manmade interference can be formed in a manmade ecosystem of perfect function in short time by manmade induction. The obviously vertical structure and positively successive ecosystem already formed in the ecosystem types of shrub, natural secondary forest and artificial mixed forest. The Shannon-Wiener variety indexes of wild grass, shrub, artificial mixed forest and natural secondary forest respectively are 2.29, 2.58, 2.04 and 2.03, and the Pielou homogeneity index JH respectively are 0.80, 0.81, 0.67 and 0.65 . The shrub type is the best eco-system on soil chemical and physical property, whose total soil porosity in 0-30 cm soil layer is 8.7% , 24.7% , 45.9% and 14.3% respectively higher than that of slope farmland, wild grass, natural secondary forest and artificial mixed forest, while the soil organic content is 19.3% , 15.9% , 276.8% and 50.9% higher respectively. The soil property of the natural secondary forest is the worst because of the bad natural environmental conditions. The artificial young forest and natural secondary forest can protect the soil from erosion very well, whose soil erosion amount respectively are 38.0% and 52.3% less than that of slope land and 25.0% and 42.3% less than that of wild grass land.
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Received: 31 March 2005
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