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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.
SubtypeArticle
2013
Source PublicationSOIL SCIENCE SOCIETY OF AMERICA JOURNAL
ISSN0361-5995
Volume77Issue:1Pages:257-267
AbstractMulching 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.
Subject AreaAgriculture
DOI10.2136/sssaj2012.0273
Indexed BySCI
Language英语
Funding Project水保所科研产出--SCI_2013--SCI
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
WOS Research AreaAgriculture
WOS SubjectSoil Science
WOS IDWOS:000321750500027
WOS KeywordPARTICLE-SIZE ; SOIL-EROSION ; AGGREGATE STABILITY ; AGRICULTURAL SOILS ; SUSPENDED SEDIMENT ; OVERLAND-FLOW ; SHEET FLOW ; RAINFALL ; RUNOFF ; TRANSPORT
Citation statistics
Cited Times:73[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/7518
Collection水保所科研产出--SCI_2013--SCI
Corresponding AuthorShi, 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.
Affiliation1.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
Recommended Citation
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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