| THE DISTRIBUTION OF PREFERENTIAL PATHS AND ITS RELATION TO THE SOIL CHARACTERISTICS IN THE THREE GORGES AREA, CHINA |
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| 作者姓名： | Hongjiang ZHANG Jinhua CHENG Yuhu SHI Yun CHENG |
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| 作者单位： | [1]Lecturer College of Soil and Water Conservation, P O box 67, Beijing Forestry University, No. 35 Qinghua East Road, Beijing, 100083, China [2]Forestry Science Institute of Hubei Province, Wuhan, 430075, China |
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| 基金项目： | 国家自然科学基金，国家自然科学基金，International Foundation for Science |
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| 摘 要： | 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.
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| 关 键 词： | 中国 三峡地区 土壤物理性质 优先流分布 相关性 |
| 收稿时间： | 2005-11 |
| 修稿时间： | 2006-05 |
THE DISTRIBUTION OF PREFERENTIAL PATHS AND ITS RELATION TO THE SOIL CHARACTERISTICS IN THE THREE GORGES AREA, CHINA |
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| Hongjiang ZHANG Jinhua CHENG Yuhu SHI Yun CHENG.THE DISTRIBUTION OF PREFERENTIAL PATHS AND ITS RELATION TO THE SOIL CHARACTERISTICS IN THE THREE GORGES AREA, CHINA[J].International Journal of Sediment Research,2007,22(1):39-48. |
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| Authors: | Hongjiang ZHANG Jinhua CHENG Yuhu SHI Yun CHENG |
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| Abstract: | 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. |
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| Keywords: | Preferential paths Morisita exponential test Physical properties of soil Infiltration characteristics of soil |
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