水土保持学报2018，Vol.32Issue(2)：40-44,5.DOI:10.13870/j.cnki.stbcxb.2018.02.006
玉米季横垄坡面土壤剥蚀率与径流含沙量关系
Relationship Between Soil Detachment Rate and Sediment Concentration in Runoff on Slope of Contour Tillage During Maize Growing Stages
摘要
Abstract
The objective of this study was to investigate the relationship between soil detachment rate and sediment concentration of ridge contour during maize growing stages.This paper took sloping farmland of purple soil in Hilly Area of Central Sichuan basin as the research object.The filed artificial rainfall experiment was carried out for determination of characteristics of soil detachment rate and sediment concentration during maize growing stages,and to find the relationship between soil detachment rate and sediment concentration.The results showed that:(1) The soil detachment rate increased with the increasing rainfall intensity during maize growing stages,and the soil detachment rate under 2.0 mm/min rainfall intensity were 1.87 and 4.59 times greater than that under 1.0 and 1.5 mm/min rainfall intensity,respectively.During maize growing stages in the field,the soil detachment rate showed a falling-and-rising trend,and was significantly higher in the seedling stage than that in other growing stages under the same rainfall intensity.(2) Within maize growing stages,the sediment yield increased firstly and then decreased under different rainfall intensities.The largest sediment yield was (306.6 g) in the seedling stage,and the least (64.6 g) was in tasseling stage.The sediment yield increased with the increasing rainfall intensity in growing stages except for tasseling stage,while the difference was significant among rainfall intensities in seedling stage and jointing stage.The sediment concentration in runoff showed a fluctuating trend during the maize growing stages in the rainfall process,and the fluctuation range increased with the increasing rainfall intensity.(3) A power function relation was listed between soil detachment rate and sediment concentration in runoff during maize growing stages,and the correlation was significant.The results provide references for revealing the mechanism of soil erosion in sloping farmland of purple soil and the construction of regional water erosion prediction model.关键词
横坡垄作/土壤剥蚀率/玉米生育期/径流含沙量/产沙量Key words
contour tillage/soil detachment rate/maize growing stage/sediment concentration in runoff/sediment yield分类
农业科技引用本文复制引用
王莹,吴漩,郑子成,李廷轩,何淑勤,林超文..玉米季横垄坡面土壤剥蚀率与径流含沙量关系[J].水土保持学报,2018,32(2):40-44,5.基金项目
国家自然科学基金项目(41271307) （41271307）
四川省教育厅项目(15ZB0009) （15ZB0009）
