Effects of rock fragments on water movement and solute transport in a Loess Plateau soil

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	Effects of rock fragments on water movement and solute transport in a Loess Plateau soil
	Zhou Beibei; Shao Ming'an; Shao Hongbo; Shao, MA
	2009
发表期刊	COMPTES RENDUS GEOSCIENCE
卷号	341 期号:6 页码:462-472
摘要	Calcium carbonate concretions are present in the soil of the Loess Plateau as a result of pedogenesis. The presence of these small rock fragments can have a great impact on soil bulk density, structure and water storage properties, as well as on soil water movement and solute transport processes. We studied the effects of different gravimetric rock fragment contents in a soil (R(w)) (0, 10, 20, 30, 40, 50, and 60%) on infiltration, saturated hydraulic conductivity (K(s)) and solute transport. Both infiltration rates and the saturated hydraulic conductivity initially decreased with increasing rock fragment content to minimum values for R(w) = 40%, and then increased. The Peck-Watson and Bouwer-Rice equations predicted K(s) for low rock fragment contents but failed to forecast the observed trends. Cumulative infiltration over time was described well by a power function. Solute transport processes, determined using CaCl(2) as a tracer, were accurately described by both the convection-dispersion equation (CDE) and the two-region model (T-R) although the T-R model fitted the experimental data a little better than the CDE, which is possibly more convenient to use. When R(w) was about 40% solute transport parameters indicated that relatively more advection occurred in this mixture where immobile regions occupied the greatest proportion of the columns. To cite this article: Z. Beibei et al., C R. Geoscience 341 (2009). (C) 2009 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.
关键词	Rock Fragment Content Cumulative Infiltration Saturated Hydraulic Conductivity Solute Transport Loess Plateau China
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	sbir.nwafu.edu.cn/handle/361005/4830
专题	水保所知识产出(1956---)
通讯作者	Shao, MA
推荐引用方式 GB/T 7714	Zhou Beibei,Shao Ming'an,Shao Hongbo,et al. Effects of rock fragments on water movement and solute transport in a Loess Plateau soil[J]. COMPTES RENDUS GEOSCIENCE,2009,341(6):462-472.
APA	Zhou Beibei,Shao Ming'an,Shao Hongbo,&Shao, MA.(2009).Effects of rock fragments on water movement and solute transport in a Loess Plateau soil.COMPTES RENDUS GEOSCIENCE,341(6),462-472.
MLA	Zhou Beibei,et al."Effects of rock fragments on water movement and solute transport in a Loess Plateau soil".COMPTES RENDUS GEOSCIENCE 341.6(2009):462-472.

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