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| Responses of slope runoff generation to rainstorm with different land use types in Jinyun mountain in Chongqing city |
| Wang Yunqi, Wang Yujie, Zhu Jinzhao, Qi Shi |
| College of Soil and Water Conservation in 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 provide basis for vegetation construction of water control and flood regulating in Three Gorges Reservior Area, response of runoff generation amount, runoff duration and runoff generation process to rainstorm was studied based on the slope runoff plots of 5 typical land use types ( mixed forest, broadleaf forest, bamboo forest, shrub forest and framland) in Jinyun mountainous region in Chongqing city, Three Gorges Reservoir Area. The results show that, in the same rainstorm condition, the surface runoff depth of bamboo forest is as 2.7 times as that of mixed forest, as 3.7 times as that of shrubs, as 4.5 times as that of farmland, and as 5.7 times as that of broadleaf forest, and the order of magnitude of underground runoff depth of mixed forest and broadleaf is greater than other land use types, and the depth is 8-10 times as deep as that of other land use types. The longest extended duration of the slope runoff generation is 248 min in the mixed forest, and the shortest is 33 min in farmland. And the longest xtented duration of the underground runoff generation is 59 h in the mixed forest, 50 h in the broadleaf forest, and the shortest is about 11 h in farmland. The peak value of surface runoff is about twice as much as that of mixed forest and shrubs, and is about 3 times as much as that of broadleaf forest and farmland. And the peak value of underground runoff generation is two grade greater than that of bamboo forest, and one greater than that of shrub forest and farmland. Therefore, the mixed forest and broadleaf forest has the greatest function of water control and flood regulation, and the func- tion of the bamboo forest is the worst.
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Received: 27 April 2005
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