Relationships of the hydraulic flow characteristics with the transport of soil organic carbon and sediment loss in the Loess Plateau

doi:10.1016/j.still.2017.09.011

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	Relationships of the hydraulic flow characteristics with the transport of soil organic carbon and sediment loss in the Loess Plateau
	Wang, D. Y.2; Liu, L.1 ; Li, Z. W.1,2; Chang, X. F.1; Nie, X. D.1,2; Liu, C.1,2; Xiao, H. B.1; Li, ZW (reprint author), CAS & MWR, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China.
刊名	SOIL & TILLAGE RESEARCH
	2018
卷号	175 页码:291-301
关键词	Soc Loss Soil Erosion Rainfall Simulation Hydraulic Characteristics Transport Mechanism
ISSN号	0167-1987
DOI	10.1016/j.still.2017.09.011
文献子类	Article
英文摘要	Erosive power is characterized by the hydraulic forces of moving water and determines the water transport capacity of soil organic carbon (SOC) and sediment. Understanding the relationships of hydraulic flow characteristics (flow velocity and depth, shear stress and stream power) with the transport of sediments and SOC will improve the understanding of the transport mechanism of sediment and SOC, which in turn will improve SOC prediction. To address this issue, two loess soils (one silt loam and one silty clay) were selected, and 32 simulated rainfall experiments were conducted in a 1 m by 5 m soil pan at a varying slopes (10 degrees, 15 degrees, 20 degrees, and 25 degrees) and two rainfall intensities (90 mm h(-1) and 120 mm h(-1)). The results showed that the flow velocities had significant positive linear relationships with the SOC concentrations (P < 0.001) under the rainfall intensity of 90 mm hand that the flow velocities also had close relationships with the suspension transport of clay particles in the fine textured soil and the rolling transport of light large aggregates in the coarse-textured soil. Under the rainfall intensity of 120 mm h(-1), the runoff depth was positively correlated with the SOC concentrations due to the suspension transport of the clay particles and was negatively correlated with the sediment concentration. The slope had a greater effect on the sediment and SOC loss of the coarse-textured soil than those of the fine-textured soil. Additionally, the stream power was a better descriptor of the sediment loss in the loess soils than shear stress. Overall, both the soil texture and rainfall intensity changed the relationships of the hydraulic flow characteristics with the sediment and SOC loss. Finally, the results of our study will provide important knowledge for improving or building hydraulic-based SOC and sediment loss models.
学科主题	Soil Science
出版地	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000414816800030
内容类型	期刊论文
源URL	[http://ir.iswc.ac.cn/handle/361005/7869]
专题	水保所科研产出--SCI_2018--SCI
通讯作者	Li, ZW (reprint author), CAS & MWR, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China.
作者单位	1.CAS & MWR, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China 2.Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China
推荐引用方式 GB/T 7714	Wang, D. Y.,Liu, L.,Li, Z. W.,et al. Relationships of the hydraulic flow characteristics with the transport of soil organic carbon and sediment loss in the Loess Plateau[J]. SOIL & TILLAGE RESEARCH,2018,175:291-301.
APA	Wang, D. Y..,Liu, L..,Li, Z. W..,Chang, X. F..,Nie, X. D..,...&Li, ZW .(2018).Relationships of the hydraulic flow characteristics with the transport of soil organic carbon and sediment loss in the Loess Plateau.SOIL & TILLAGE RESEARCH,175,291-301.
MLA	Wang, D. Y.,et al."Relationships of the hydraulic flow characteristics with the transport of soil organic carbon and sediment loss in the Loess Plateau".SOIL & TILLAGE RESEARCH 175(2018):291-301.