水土保持研究2013，Vol.20Issue(1)：19-24,6.
紫色土区土壤初始含水量对坡面径流溶质流失的影响
Effect of the Soil Antecedent Water Content on Soil Solutes Loss on Slope of Purple Soil Region
摘要
Abstract
Soil antecedent water content affects soil and water loss in purple soil area to some extent. According to the results of lab simulation rainfall experiments, the process and mechanism of rainfall infiltration, runoff process, release-transport and change of runoff and solutes less than four soil antecedent water content 5%, 10%, 15% and 20% were studied on purple soil region. The results showed that runoff intensity presents a logarithmic function with rainfall time changing, runoff intensity trended to be steady about 25 minutes later when rain occurred. The change of accumulated output runoff presented a linearity relationship with soil antecedent water content in unit time. The soil surface runoff and an average depth increase with the rise of initial the moisture contents, and the average infiltration rates on slope changes in the reverse trend. The concentrations of PO3-4, K+ , Br- of runoff presented the same law, at the beginning of runoff yields, the runoff concentration was very high, and then it got down quickly, finally, it trended to be steady. The soil solute losses was gaining with the increase of soil antecedent water contents, the process that the solutes transport from soil to runoff increased quickly to a peak value from a very small concentration, then gradually decayed to a stable content. Exponential function model was more siutable to describe the process of runoff solutes release, transport and change on purple soil hilly region compared with power function model.关键词
紫色土/土壤初始含水量/土壤侵蚀/养分流失Key words
purple soil/ soil antecedent water content/ soil erosion/ nutrient loss分类
农业科技引用本文复制引用
秦川,何丙辉,王亮,刘永鑫..紫色土区土壤初始含水量对坡面径流溶质流失的影响[J].水土保持研究,2013,20(1):19-24,6.基金项目
农业部行业公益性科研项目"南方山地丘陵区面源污染监测与氮磷投入阈值研究"(201003014-6-3) （201003014-6-3）
国家科技支撑计划(2011BAD31B03) （2011BAD31B03）
国家自然科学基金(40671115) （40671115）
西南大学生态学重点学科"211工程"三期建设项目 （）
