不同降雨条件下侵蚀泥沙黏粒含量的变化规律

ISWC OpenIR > 水保所知识产出(1956---)

	不同降雨条件下侵蚀泥沙黏粒含量的变化规律
其他题名	Temporal Variations of Clay Content in Eroded Sediment Under Different
	吴凤至; 史志华; 方怒放; 岳本江
	2012
发表期刊	环境科学
卷号	33 期号:07 页码:2497-25-3
摘要	以2种典型黄土为研究对象,在模拟降雨条件下,研究了不同雨强和坡度条件下侵蚀过程中黏粒含量的变化规律,比较了泥沙侵蚀颗粒(未分散)和泥沙原始颗粒(分散后)大小分布特征,分析了团聚率和富集率.结果表明,泥沙侵蚀黏粒含量随着坡长和雨强的增大而增加,黄绵土变化明显,增加了8.77%和2.43%;而塿土只增加了2.76%和0.4%.随坡度的增大而减小,分别减少了4.91%和3.93%.黏粒团聚率<1,富集率>1,在侵蚀搬运过程中作为黏粒团被搬运,导致黏粒的富集.研究结果有助于深入了解泥沙颗粒在坡面侵蚀过程中的变化规律,深入理解土壤侵蚀机制,也能为面源污染模型的建立提供重要基础. 更多还原
其他摘要	Erosion and sediment characteristics were measured using simulated rainfall on two cultivated soils from the Loess Plateau， China． The size distribution of eroded sediment ( non-dispersed) was compared with equivalent measurements of the same samples after chemical and mechanical dispersion( dispersed) to investigate the aggregation ratio ( AR) and enrichment ratio( ER) ． Results show that clay content is increasing with the length and rainfall intensity． The loessial soil increased by 8. 77% and 2. 43%，but the Lou soil increased by only 2. 76% and 0. 4%． With the increase of slope，the clay content of the two loess reduced by 4. 91% and 3. 93%， respectively． AR values were less than 1 and ER values were greater than 1． These indicated that relatively slight clay dispersion occurred and that most of the clay in the sediments was in the form of aggregates． The results will improve understanding of erosion and sedimentation processes，which in turn will improve erosion modeling． Knowledge of temporal variations of clay in sediment can also provide the basis for understanding and modeling the transfer of nutrients on hillslope．
关键词	人工模拟降雨 Simulated Rainfall 坡面侵蚀 Soil Erosion 黏粒含量 Clay Content 团聚率 Aggregation Ratio 富集率 Enrichment Ratio
语种	中文
文献类型	期刊论文
条目标识符	sbir.nwafu.edu.cn/handle/361005/5357
专题	水保所知识产出(1956---)
推荐引用方式 GB/T 7714	吴凤至,史志华,方怒放,等. 不同降雨条件下侵蚀泥沙黏粒含量的变化规律[J]. 环境科学,2012,33(07):2497-25-3.
APA	吴凤至,史志华,方怒放,&岳本江.(2012).不同降雨条件下侵蚀泥沙黏粒含量的变化规律.环境科学,33(07),2497-25-3.
MLA	吴凤至,et al."不同降雨条件下侵蚀泥沙黏粒含量的变化规律".环境科学 33.07(2012):2497-25-3.

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