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THE DISTRIBUTION OF PREFERENTIAL PATHS AND ITS RELATION TO THE SOIL CHARACTERISTICS IN THE THREE GORGES AREA,CHINA

International Journal of Sediment Research 2007年第1期22卷 39-48页

作者： Hongjiang ZHANG1, Jinhua CHENG2, Yuhu SHI3, and Yun CHENG41 Prof., 2,4 Lecturer College of Soil and Water Conservation, P O box 67, Beijing Forestry University, No. 35 Qinghua East Road, Beijing, 100083, China, 3 Assoc. Prof., Forestry Science Institute of Hubei Province, Wuhan, 430075, China Beijing Forestry Univ Coll Soil & Water Conservat Beijing 100083 Peoples R China Forestry Sci Inst Wuhan 430075 Hubei Peoples R China

To study the characteristics of the distribution of the preferential paths and the affecting factors in the Three Gorges area, four soil profiles were dug to observe the distribution of preferential paths in the Quxi watershed in the Yangtze River basin. The morisita exponential test method was used to examine the distribution type of preferential paths. The physical properties and infiltration characteristics of the soil were also measured to evaluate their relationship to preferential paths. The results showed that in this area, preferential paths clustered and mainly distributed in the 80-100 cm soil layer, and along the interface between the weathered layer and semi-weathered layer. There were more non-capillary pores in the 83-110 cm layer than in the other layers. It can be derived that most non-capillary pores in this layer were preferential paths caused by geological processes and rotten plant roots. The percentage of coarse soil particles increased with the depth of the soil layer. In the deeper soil layer, the coarse soil particles helped the formation of preferential paths. The fastest steady infiltration rate was observed in the of 83-110cm layer, which is inferred to be due to the greater number of preferential paths.

关键词： Preferential paths morisita exponential test Physical properties of soil Infiltration characteristics of soil

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