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| Effect of the vegetation types on runoff generation on slope land in Simian Mountain of Chongqing |
| Qi Shenglin, Zhang Hongjiang, He Fan, Cheng Jinhua |
| College of Soil and Water Conservation, Beijing Forestry University, Key Lab of Soil and Water Conservation and Desertification Combating, Ministry of Education 100083, Beijing, China |
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Abstract To study effect of vegetation types on runoff generation on slope land in the Three Gorges reservoir area of the Yangtze River, 5 kinds of standard runoff plot were laid out under different vegetation types in the Simian Mountain of Chongqing City. The vegetation types included mixed broadleaf-conifer forest, broad-leaved forest, Phyllostachys pubescens forest,shrub and agricultural cultivated land. Rainfall and surface runoff were measured on the plots. Results show that the grade of average values of surface runoff under different vegetation types was: agricultural cultivated land>shrub> Phyllostachys pubescens forest> broad-leaved forest> broadleaf-conifer forest. The values are 6.45mm, 4.12mm, 2.91mm, 2.34mm, 1.57mm. Surface runoff in selected arbor forestlands is smaller than that in agricultural cultivated land. Significant difference does not exist in surface runoff in different arbor forestlands. The correlation between rainfall amount and surface runoff in forestlands and agricultural cultivated land are notable, shown as polynomial function or power function. The correlation between rainfall intensity and surface runoff in forestlands and agricultural cultivated land are also notable, shown as polynomial function or power function. On the same rainfall condition, the variation tendencies of surface runoff in these types of forestland and agricultural cultivated land are different. And the amount of surface runoff in agricultural cultivated land is always the most.
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Received: 10 August 2005
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