水土保持学报2017，Vol.31Issue(5)：45-50,6.DOI:10.13870/j.cnki.stbcxb.2017.05.008
不同尺度下冻融作用对东北黑土区产流产沙的影响
Effects of Freezing and Thawing on Runoff and Sediment Yield in the Black Soil Region of Northeast China at Different Scales
摘要
Abstract
Based on runoff and sediment yield at plot and small watershed scales by field monitoring of 8 years and 7 years respectively in the black soil region of Northeast China,the characteristics of runoff and sediment yield of the first two rainfall events and those of the rest events were compared,which represented the runoff and sediment yield that was influenced and not influenced by freezing and thawing respectively.Results showed that with the effects of freezing and thawing,the runoff coefficient reduced by 0.07 and 0.03 at plot and small watershed scale respectively.Initial abstraction duration increased by 71.7％ at slope scale;while,there was no obvious increase at small watershed scale.Soil loss,soil erodibility and sediment concentration increased significantly at both scales under freezing and thawing,and soil erosion was more likely to occured.When the runoff was small,the sediment amount of the rainfall events with freezing and thawing was smaller than that of the rainfall events without it.Compared to those rainfall events without freezing and thawing,the rainfall events with freezing and thawing led to the runoff reduction.As a result,sediment amount of the rainfall events with freezing and thawing was lower at the same rainfall,while it was higher at the same runoff.Freezing and thawing had a more evident effect on rill development and sediment amount at plot scale when runoff was small,as well as capacity of the loose deposits transportation and sediment amount at small watershed scale when runoff was large.The results provide a scientific basis for the quantitative evaluation and transformation model of soil erosion with freezing and thawing in the black soil region of Northeast China.关键词
冻融/径流小区/小流域/产流产沙/黑土区Key words
freezing and thawing/field plot/small watershed/runoff and sediment yield/black soil region分类
农业科技引用本文复制引用
刘笑妍,张卓栋,张科利,刘刚..不同尺度下冻融作用对东北黑土区产流产沙的影响[J].水土保持学报,2017,31(5):45-50,6.基金项目
国家自然科学基金项目(41471224) （41471224）
