水土保持学报2018，Vol.32Issue(2)：150-159,10.DOI:10.13870/j.cnki.stbcxb.2018.02.022
中国5种典型土壤的侵蚀泥沙粒径分布特征
Size Distribution Characteristics of Sediments Eroded from Five Typical Soils in China
摘要
Abstract
This study investigated the size distributions of aggregates and primary particles in the sediments eroded from five typical soils in China under natural rainfalls.The experiment was conducted on five runoff plots packed with the Red Soil,Purple Soil,Loess,Cinnamon Soil and Black Soil.Sediment samples in four runoff events of these plots under natural rainfall were collected during June to September in 2013 and 2014.Using the pipette method and wet sieving technique,the compositions and size distributions of primary particles and aggregates were measured.Moreover,the sediment aggregates with different sizes were sieved and determined for the size distribution of primary particles.The results showed that:(1) The sediment size distribution was affected by both soil texture and rainfall intensity.The aggregate size distribution was more suitable as a better indicator for sediment transport.(2) Larger portions of silt-sized (0.002～0.05 mm) and clay-sized (＜0.002 mm) aggregates were obtained in the sediments of five types of soils.(3) However,no obvious enrichment of primary particles was observed in the eroded sediments of any soil but the Red Soil,which possessed slightly elevated percentages of silt and clay in the corresponding sediments.(4) When further analyzing the primary particle-size composition of sediment aggregates with different size,the highest percentage of clay particles was determined in the silt-sized aggregates of the Red Soil.For the rest four types of soils,the mechanical composition of eroded sediment and the mechanical composition of the aggregates at all sizes were all similar to the source soil.关键词
侵蚀泥沙/团粒粒径分布/单粒粒径分布/富集率/天然降雨Key words
runoff sediment/aggregate-size distribution/size distribution of primary particle/enrichment ratio/natural rainfall分类
农业科技引用本文复制引用
郝燕芳,刘宝元,杨扬,刘瑛娜,王友胜..中国5种典型土壤的侵蚀泥沙粒径分布特征[J].水土保持学报,2018,32(2):150-159,10.基金项目
国家重点研发计划项目(2016YFC0501604) （2016YFC0501604）
长江学者和创新团队发展计划项目(IRT_15R06) （IRT_15R06）
