黄土溅蚀过程中土壤有效粒径分布和富集/损耗的临界粒径  

Effective soil particle size distributions and critical size of enrichment/depletion in splash erosion for loessial soil

作　　者：齐小倩 程西科 刘俊娥 周正朝 王宁 申楠 马春艳 王占礼 QI Xiaoqian;CHENG Xike;LIU June;ZHOU Zhengchao;WANG Ning;SHEN Nan;MA Chunyan;WANG Zhanli(School of Geography and Tourism,Shaanxi Normal University,Xi’an 710119,China;State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Soil and Water Conservation,Northwest A&F University,Yangling 712100,Shaanxi,China;Yulin University,Shaanxi Key Laboratory of Ecological Restoration in Shaanbei Mining Area,Yulin 719000,Shaanxi,China)

机构地区：[1]School of Geography and Tourism,Shaanxi Normal University,Xi’an 710119,China [2]State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Soil and Water Conservation,Northwest A&F University,Yangling 712100,Shaanxi,China [3]Yulin University,Shaanxi Key Laboratory of Ecological Restoration in Shaanbei Mining Area,Yulin 719000,Shaanxi,China

出　　处：《Journal of Geographical Sciences》2023年第10期2113-2130,共18页地理学报（英文版）

基　　金：Natural Science Foundation of China,No.42077058,No.41601282,No.41867015;Young Talent Fund of University Association for Science and Technology in Shaanxi,China,No.20210705;Fundamental Research Funds for Central Universities,No.GK202309005;Shaanxi Provincial Key Research and Development Program,No.2021ZDLSF05-02。

摘　　要：Effective soil particle size composition can more realistically reflect the particle size sorting process of erosion.To reveal the individual contributions of rainfall intensity and slope to splash erosion,and to distinguish the enrichment ratio of each size and the critical size in splash,loessial soil collected on the Loess Plateau in May 2019 was tested under different rainfall intensities(60,84,108,132,156 mm h^(-1))and slopes(0°,5°,10°,15°,20°).The results demonstrated that 99%of splash mass was concentrated in 0–0.4 m.Rainfall intensity was the major factor for splash according to the raindrop generation mode by rainfall simulator nozzles.The contributions of rainfall intensity to splash erosion were 82.72%and 93.24%,respectively in upslope and downslope direction.The mass percentages of effective clay and effective silt were positively correlated with rainfall intensity,while the mass percentages of effective very fine sand and effective fine sand were negatively correlated with rainfall intensity.Opposite to effective very fine sand,the mass percentages of effective clay significantly decreased with increasing distance.Rainfall intensity had significant effects on enrichment ratios,positively for effective clay and effective silt and negatively for effective very fine sand and effective fine sand.The critical effective particle size in splash for loessial soil was 50μm.

关 键 词：splash erosion loessial soil effective soil particles splash distance enrichment ratio 

分 类 号：S157[农业科学—土壤学]