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当前位置: 首页 > 文章 > 干湿交替作用对西南地区黄壤团聚体稳定性的影响 水土保持学报 2017 (3) 317-321+329
Position: Home > Articles > Influence of Dry-Wet Cycles on Aggregate Stability of Yellow Soil in Southwest China Journal of Soil and Water Conservation 2017 (3) 317-321+329

干湿交替作用对西南地区黄壤团聚体稳定性的影响

作  者：
邬铃莉;王玉杰;王彬;王云琦;胡波;谭锦
单  位：
北京市水土保持工程技术研究中心(北京林业大学);北京林业大学水土保持学院
关键词：
Le Bissonnais法;干湿交替;前期含水率;团聚体稳定性
摘  要：
为了探究我国西南地区干湿交替作用对土壤团聚体稳定性的影响,选取重庆缙云山典型黄壤为研究对象,在4个前期含水率(风干,10%,15%,20%)水平下,对4组不同粒级团聚体(1~2,2~3,3~5,5~7mm)分别进行7个不同干湿交替过程(1,2,3,5,7,10,15次)模拟。采用Le Bissonnais法,对干湿交替作用后的团聚体在不同破碎机制下的稳定性特征进行了探讨。结果表明:(1)快速湿润(FW)对团聚体稳定性的破坏程度最大,且与机械扰动(ST)和慢速湿润(SW)存在显著差异;(2)小粒径团聚体相较于大粒径团聚体稳定性更高;(3)干湿交替过程对团聚体存在明显的破坏作用,且在不同含水率变化范围下其破坏程度不同;(4)干湿交替作用主要通过影响团聚体破碎后>2mm团聚体的百分比含量来影响团聚体的稳定性。该结果对于研究西南地区土壤侵蚀的发生机理具有一定的参考价值。
译  名：
Influence of Dry-Wet Cycles on Aggregate Stability of Yellow Soil in Southwest China
作  者：
WU Lingli;WANG Yujie;WANG Bin;WANG Yunqi;HU Bo;TAN Jin;College of soil and water conservation,Beijing Forestry University;Beijing Engineering Research Center of Soil and Water Conservation (Beijing Forestry University);
关键词：
Le Bissonnais method;;dry-wet cycle;;antecedent moisture content;;aggregate stability
摘  要：
To explore the influence of dry-wet cycles on soil aggregate stability in Southwest China,an experiment was conducted in the Jinyun mountain in Chongqing.The typical yellow soil in cultivated land was taken as the research object.With four groups of aggregates of different particle sizes(1-2,2-3,3-5,and 5-7mm),seven dry-wet cycle processes(1,2,3,5,7,10,and 15times)under four antecedent moisture levels(air dried,10%,15%,and 20%)were simulated.The stability features of soil aggregates after dry-wet cycles under different broken mechanisms were discussed with the Le Bissonnais method.The results showed that:(1)Fast wetting(FW)had the most serious damage on soil aggregate stability,and there was a significant difference between FW and the other two broken mechanisms(slow wetting(SW)and stirring(ST)).(2)Compared with large-size aggregates,the stability of small-size aggregates was higher.(3)The destructive effect of dry-wet cycles on aggregate stability was obvious,and the extent of the damage was different under different antecedent moisture levels.(4)The dry-wet cycle processes mainly affected the stability of aggregates by affecting the percentage of>2mm aggregate fragmentation.These results had an important reference value for the study of soil erosion mechanisms in Southwest China.

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