Effects of Mulch Cover Rate on Interrill Erosion Processes and the Size Selectivity of Eroded Sediment on Steep Slopes

doi:10.2136/sssaj2012.0273

ISWC OpenIR > 水保所科研产出--SCI > 2013--SCI

	Effects of Mulch Cover Rate on Interrill Erosion Processes and the Size Selectivity of Eroded Sediment on Steep Slopes
	Shi, Z. H.1,2; Yue, B. J.1; Wang, L.1; Fang, N. F.1; Wang, D.1; Wu, F. Z.2; Shi, ZH (reprint author), Chinese Acad Sci, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China.
文章类型	Article
	2013
发表期刊	SOIL SCIENCE SOCIETY OF AMERICA JOURNAL
ISSN	0361-5995
卷号	77 期号:1 页码:257-267
摘要	Mulching with vegetative residue is an effective soil conservation practice. A better understanding of sediment characteristics associated with various mulch rates would improve the use of this practice for soil conservation. An experiment was conducted to evaluate the effects of straw mulch on runoff, erosion, and the particle-size distribution (PSD) of eroded sediment. Straw mulch rates of 0, 15, 30, 50, 70, and 90% cover were tested using simulated rainfall. The effective PSD of sediment (undispersed) was compared with equivalent measurements of the same samples after dispersion (ultimate PSD) to investigate the detachment and transport mechanisms involved in sediment mobilization. The maximum stream occurred at a different time from the peak sediment concentration during rainstorms under low mulch rates, which indicated the predominance of supply-limited conditions. However, at higher mulch rates the erosion processes were typical of a transport-limited sediment regime. The ratio of the sediment transported as primary clay to the soil matrix clay content was always less than 1, meaning that most of the clay was eroded in the form of aggregates. Transport selectivity was reflected by the silt enrichment, and silt-sized particles were transported mainly as primary particles since their effective-ultimate ratio was close to 1. The enrichment ratios for the sand-sized fractions decreased from 0.98 to 0.38 with increased mulch rates, and effective-ultimate ratios for sand-sized particles were always greater than 1, indicating that most of these particles were predominantly aggregates of finer particles, especially at high mulch rates. The findings reported in this study have important implications for the assessment and modeling of interrill erosion processes.
学科领域	Agriculture
DOI	10.2136/sssaj2012.0273
收录类别	SCI
语种	英语
资助项目	水保所科研产出--SCI_2013--SCI
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
WOS研究方向	Agriculture
WOS类目	Soil Science
WOS记录号	WOS:000321750500027
关键词[WOS]	PARTICLE-SIZE ; SOIL-EROSION ; AGGREGATE STABILITY ; AGRICULTURAL SOILS ; SUSPENDED SEDIMENT ; OVERLAND-FLOW ; SHEET FLOW ; RAINFALL ; RUNOFF ; TRANSPORT
引用统计	被引频次：73[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	sbir.nwafu.edu.cn/handle/361005/7518
专题	水保所科研产出--SCI_2013--SCI
通讯作者	Shi, ZH (reprint author), Chinese Acad Sci, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China.
作者单位	1.Chinese Acad Sci, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China 2.Huazhong Agr Univ, Coll Resources & Environm, Wuhan 430070, Peoples R China
推荐引用方式 GB/T 7714	Shi, Z. H.,Yue, B. J.,Wang, L.,et al. Effects of Mulch Cover Rate on Interrill Erosion Processes and the Size Selectivity of Eroded Sediment on Steep Slopes[J]. SOIL SCIENCE SOCIETY OF AMERICA JOURNAL,2013,77(1):257-267.
APA	Shi, Z. H..,Yue, B. J..,Wang, L..,Fang, N. F..,Wang, D..,...&Shi, ZH .(2013).Effects of Mulch Cover Rate on Interrill Erosion Processes and the Size Selectivity of Eroded Sediment on Steep Slopes.SOIL SCIENCE SOCIETY OF AMERICA JOURNAL,77(1),257-267.
MLA	Shi, Z. H.,et al."Effects of Mulch Cover Rate on Interrill Erosion Processes and the Size Selectivity of Eroded Sediment on Steep Slopes".SOIL SCIENCE SOCIETY OF AMERICA JOURNAL 77.1(2013):257-267.

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