Effects of forest vegetation on runoff and sediment transport of watershed in Loess area, west China |
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Authors: | Xiaoming Zhang Xinxiao Yu Sihong Wu Huifang Liu |
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Institution: | (1) Key Laboratory of Soil and Water Conservation and Desertification Combating, Ministry of Education, College of Soil and Water Conservation, Beijing Forestry University, Beijing, 100083, China;(2) Beijing World Hazard Preventing Technology Co., Ltd, Beijing, 100044, China |
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Abstract: | This paper aims to study the effects of vegetation on runoff and sediment transport at the watershed scale, and to provide
a theoretical basis for afforestation in the Loess area, in the nested Caijiachuan watershed, Jixian County, Shanxi Province
of west China. Forest watersheds and farmland watersheds with similar terrain features were selected through cluster analysis
to study their runoff and sediment transport characteristics. Results showed that compared with farmland watersheds, runoff
generation time in forest watersheds was delayed remarkably, and peak flow was reduced greatly, which indicates that vegetation
played an important role in holding and absorbing rainfall. Besides, with the increase of forest coverage, the runoff amount,
runoff depth and runoff coefficient decreased during the rainy seasons. The runoff depth and runoff coefficient of farmland
watersheds in the rainy season were 5–20-fold as much as that of forest watersheds, and runoff and sediment yield of watersheds
with low forest coverage were 2.7–2.9-fold and 3–6-fold as great as those with high coverage during rainstorms, and low forest
coverage had larger variation in sediment hydrograph. For the complexity and scale dependence of the influence of forest vegetation
on runoff, forest hydrological functions based on regional scale or watershed scale were worthy of further studies.
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Translated from Science of Soil and Water Conservation, 2006, 4(3): 48–53 译自: 中国水土保持科学] |
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Keywords: | forest vegetation runoff sediment transport cluster analysis Loess area |
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