| 三峡库区花岗岩林地土壤特性与“优先路径”的关系 |
| |
| 引用本文： | 程金花,张洪江,史玉虎.三峡库区花岗岩林地土壤特性与“优先路径”的关系[J].中国水土保持科学,2005,3(1):97-101. |
| |
| 作者姓名： | 程金花 张洪江 史玉虎 |
| |
| 作者单位： | 1. 北京林业大学水土保持学院,100083,北京
2. 湖北省林业科学研究院,430075,武汉 |
| |
| 基金项目： | 国家自然科学基金项目"长江三峡库区优先流对地表径流过程的影响"(40171014)的部分研究内容; This research was supported by the International Foundation for Science, Stockholm, Sweden(瑞典国际科学基金(IFS)), through a grant to CHENG Jinhua. The granted project is "The impact of preferential flow on flood process in woodland in the three gorges of Yangtze River region"(Grant No.D/3492-1) |
| |
| 摘 要： | “优先路径”是指土壤中植物根系穿插而产生的根孔、动物的运动通道和居穴、由于土壤膨胀收缩形成的裂隙,以及因湿润锋不稳定所形成的指状渗透通道等。通过在长江三峡曲溪小流域花岗岩林地坡面开挖土壤剖面,测定了“优先路径”在剖面的分布状况,并采取土壤样品,对土壤的物理特性用筛分法进行了室内测定。结果表明:剖面中距地表以下82～110cm范围内,土壤密度最小,其毛管孔隙度也较小,显示出其土壤中存在有较多非毛管孔隙构成的“优先路径”。“优先路径”在距地表以下80～100cm范围内,分布比较集中。该范围内含有较多粗颗粒物质,有利于“优先路径”的形成。“优先路径”的存在,使该层土壤稳渗速率较其他土层得以大幅度提高,土层内快速运动的水流,又加速了“优先路径”的形成与发展。“优先路径”的存在,影响着土壤物理特性,而土壤物理性质,对“优先路径”的形成与发展,也有较大影响。
|
| 关 键 词： | 土壤特性 优先路径 非毛管孔隙 花岗岩地区 |
| 修稿时间： | 2004年4月20日 |
Relationship between soil characteristics and preferential flow paths in forest land of granite area, the Three Gorges |
| |
| Cheng Jinhua,Zhang Hongjiang,Shi Yuhu.Relationship between soil characteristics and preferential flow paths in forest land of granite area, the Three Gorges[J].Science of Soil and Water Conservation,2005,3(1):97-101. |
| |
| Authors: | Cheng Jinhua Zhang Hongjiang Shi Yuhu |
| |
| Institution: | 1.College of Soil and Water Conservation, Beijing Forestry University, Beijing, 100083; 2.Forestry Academy of Hubei Province, 430075, Wuhan: China |
| |
| Abstract: | Preferential flow paths” means the soil pores formed by plant roots, burrowing animals, cracks and fissures caused by soil shrinkage and soil swell and finger channels made by unsteady wet front. The distribution of "preferential flow paths" in soil profile was measured through the field experiments of a soil profile. Soil water characteristics were also measured by standard laboratory measurements of soil samples. The results showed that soil bulk density at depths 83cm to 110cm was the lowest. The volume of capillary pores is less than that in other layers. This shows that there are many “preferential flow paths” caused by non-capillary pores in this layer. The results also show that “preferential flow paths” are higher in the soil layer from 80*!cm to 100*!cm. The soil in this layer contains many coarse particles, which is benefit to form “preferential flow paths”. The “preferential flow paths” accelerates the saturated infiltration rate of this soil layer, and the quickly moving water in this layer also enhances further formation and development of “preferential flow paths”. The existence of “preferential flow paths” affects soil water characteristics; and on the other hand, soil water characteristics influence the formation and development of “preferential flow paths”. |
| |
| Keywords: | soil characteristics preferential flow paths non-capillary pore granite area |
| 本文献已被 维普 万方数据 等数据库收录！ |
| 点击此处可从《中国水土保持科学》浏览原始摘要信息 |
| 点击此处可从《中国水土保持科学》下载免费的PDF全文 |
|
