Soil Anti-scourability under Different Land Uses in Dry-Warm Valleys of the Jinshajiang River Basin

ZHOU Wei; ZHANG Jian-hui; LI Yong; GE Fang-long; LUO Ying; FAN Jian-rong

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Soil Anti-scourability under Different Land Uses in Dry-Warm Valleys of the Jinshajiang River Basin

- Soil Anti-scourability under Different Land Uses in Dry-Warm Valleys of the Jinshajiang River Basin
- Bulletin of Soiland Water Conservation Vol. 25, Issue 5, Pages: 26-30(2006)
- 作者机构：
  
  1. 中国科学院水利部成都山地灾害与环境研究所,四川,成都,610041
  2. 中国农业科学院农业环境与可持续发展研究所,北京,100039
  3. 中国科学院,研究生院,北京,100039
- 作者简介：
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- Published：2006
- 稿件说明：
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ZHOU Wei, ZHANG Jian-hui, LI Yong, et al. Soil Anti-scourability under Different Land Uses in Dry-Warm Valleys of the Jinshajiang River Basin[J]. Bulletin of Soiland Water Conservation, 2006, 25(5): 26-30.
DOI：

ZHOU Wei, ZHANG Jian-hui, LI Yong, et al. Soil Anti-scourability under Different Land Uses in Dry-Warm Valleys of the Jinshajiang River Basin[J]. Bulletin of Soiland Water Conservation, 2006, 25(5): 26-30. DOI：

摘要

采用原状土冲刷法对金沙江干暖河谷冲沟侵蚀区4种不同土地利用条件下的土壤进行抗冲性试验研究。结果指出，不论何种土地利用类型表层土壤的抗冲性随时间增长而增强，其关系可以用幂函数得到较好的拟合；土壤抗冲性强弱表现为荒草地稳定沟>荒草地活动沟>耕地>裸地活动沟，这4者的土壤抗冲性指标均值比为1．0：1．4：3．0：21．5(荒草地稳定沟：荒草地活动沟：耕地：裸地活动沟)。这4种土地利用类型的亚表层土壤的抗冲性也有相同的趋势。研究表明，植物根系有明显的减沙效应，根系密度与根量是土壤抗冲能力的2个重要的生物指标。土壤有机质、>0．25mm水稳性团聚体，尤其是粗粒径(3～5 mm，5～10mm，>10mm)的水稳性团聚体的增加有利于提高土壤的抗冲性。

Abstract

Soil anti-scourability for four different land uses in the Dry-Warm Valleys of the Jinsha River Basin was studied by the flume experiment.The anti-scourability of surface soil increased with time

and the relationships for the land uses can be fitted by power function.The anti-scourability followed the order of stable gully>active gully>cultivated land>bare land.The ratio of the mean values of soil anti-scourability was 1.0:1.4:3.0:21.5 for stable gully

active gully

cultivated land and bare land

respectively.The same relationships held for subsurface soil in the period of the first 5 minute infiltration.Grass roots play an effective role in increasing soil anti-scourability. Soil anti-scouring ability is closely related to soil organic matter

and the content of>0.25 mm water-stable aggregate size fractions (especially of 3～5 mm

5～10 mm

>10 mm).

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