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| Influence of Land Preparation for Afforestation on Runoff Producing and Transport from Slopes with Young Planted Trees System |
| Wang Jinxin1，Huang Baolong2,Luo Weixiang1 |
| 1.Northwest Sci-Tech University of Agriculture & Forest, 712100, Yangling, Shaanxi; 2.Nanjing Forestry University, 210037, Nanjing: China |
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Abstract By means of theoretical model and mechanism of producing and conflux of runoff, the key pathway of surface runoff regularity of young planted trees system was studied. The results showed that topography was extremely important among the three factors of rainfall, soil and topography which affected the runoff producing and conflux. The land preparation for afforestation to change micro-basin characteristics such as length, gradient and configuration of surface was a simple and effective measure for controlling surface runoff in the planted trees site of Loess Plateau. But if the land preparation work was designed according to traditional records of runoff plot with straight slope, it could not reach the desired design standard, which can only reduce runoff by 39.92%～51.80%, 52.39%～52.86%, 62.66%～65.11% for fish-scale pits, contour trench, reverse-slope terrace respectively. Compared with traditional runoff plot of straight slope, the runoff records of land-preparation plot can only illustrate the total effect of land preparation in reducing runoff, but can not demonstrate the influence nature of land preparation to runoff producing. It was the neglecting of impact of muddy water infiltration, slope gradient and configuration on surface runoff producing and erosion that weakened the expected functions for reducing erosion and runoff transportation on design.
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Received: 05 April 2004
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