Effect of Land Use on Scouring Flow Hydraulics and Transport of Soil Solute in Erosion
Publication: Journal of Hydrologic Engineering
Volume 18, Issue 4
Abstract
Water flushing was applied to different land use plots on Loess slopes to examine the effect of land use changes on flow hydraulics and the transport of soil surface solutes in erosion. The runoff and movement of sediment and soil solutes were analyzed in relation to land use and scouring flow. Flow experiments were conducted with five land use treatments: abandoned land (Salsola ruthenica), alfalfa land (Medicago sativa), corn land, scrub land (Caragana intermedia), and bare land. The results show that at the same scouring time, the cumulative sediment yields with different land use types are: bare land > corn land > Caragana intermedia land > abandoned land > alfalfa land. The unit sediment loads are similar to this modulus of the cumulative sediment yields. The pre-experimental water contents of the soil profile exerted a greater effect on the content of soil moisture and its distribution on the slope than that of the antecedent solute contents in the field experiment conditions for different land use types. The land use types also affected the surface transport of soil solute. The bromide concentrations in runoff were in the order of: bare land > corn land > alfalfa land > Caragana intermedia land > abandoned land. The nitrate concentrations in runoff with different land use types had no obvious orderliness. However, the nitrate concentration was lineally related to the bromide concentration, as expressed by ().
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Acknowledgments
This work were partially supported by research projects under 973 Program (project No. 2011CB411903), the Key Project of National Natural Science Foundation of China (project No. 51239009), the National Natural Science Foundation of China (project Nos. 41101257 and 41171221), the CAS/SAFEA International Partnership Program for Creative Research Teams—Process simulation of soil and water of a watershed, and the Director Foundation of State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau (Project No: 10501-252). We are grateful for the assistance of Institute of Soil and Water Conservation, Chinese Academy of Science.
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Published In
Journal of Hydrologic Engineering
Volume 18 • Issue 4 • April 2013
Pages: 465 - 473
Copyright
© 2013 American Society of Civil Engineers.
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Received: Mar 11, 2011
Accepted: Feb 13, 2012
Published online: Feb 16, 2012
Published in print: Apr 1, 2013
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