水土保持学报2017，Vol.31Issue(3)：317-321,329,6.DOI:10.13870/j.cnki.stbcxb.2017.03.052
干湿交替作用对西南地区黄壤团聚体稳定性的影响
Influence of Dry-Wet Cycles on Aggregate Stability of Yellow Soil in Southwest China
摘要
Abstract
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 5-7 mm),seven dry-wet cycle processes (1,2,3,5,7,10,and 15 times) 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 ＞2 mm aggregate fragmentation.These results had an important reference value for the study of soil erosion mechanisms in Southwest China.关键词
Le Bissonnais法/干湿交替/前期含水率/团聚体稳定性Key words
Le Bissonnais method/dry-wet cycle/antecedent moisture content/aggregate stability分类
农业科技引用本文复制引用
邬铃莉,王玉杰,王彬,王云琦,胡波,谭锦..干湿交替作用对西南地区黄壤团聚体稳定性的影响[J].水土保持学报,2017,31(3):317-321,329,6.基金项目
国家“十三五”科技支撑计划子课题“三峡库区城郊防护林结构调控与高效经营技术”(2015BAD07B040304) （2015BAD07B040304）
