The effect of rock fragment size and position on topsoil moisture on and and semi-arid hillslopes

被引:64
作者
Katra, Itzhak [1 ]
Lavee, Hanoch [1 ]
Sarah, Pariente [1 ]
机构
[1] Bar Ilan Univ, Dept Geog & Environm, IL-52900 Ramat Gan, Israel
关键词
runoff; source-sink areas; stone flow; surface; water redistribution;
D O I
10.1016/j.catena.2007.04.001
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Rock fragments on and hillslopes affect rainwater redistribution and overland flow, through various hydrological processes. The present study focuses on the evolution of topsoil moisture content under rock fragments following rain events. Measurement was taken under rock fragments in various sizes (large and small) and positions ('on top' of the soil surface and 'partially embedded' within the soil surface) at north- and southfacing hillslopes in and and semi-arid areas. The main findings: (1) the topsoil moisture content under rock fragments was higher over time than that of bare soil areas; (2) rock fragments affect the topsoil moisture content for a longer time in semi-arid areas than in and areas; and (3) large rock fragments and 'partially embedded' ones are favorable micro-environments for accepting and retaining rainwater and overland flowing water. This may have eco-geomorphic implications regarding the mosaic-like patterns of source and sink areas on and hillslopes. (c) 2007 Elsevier B.V. All rights reserved.
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页码:49 / 55
页数:7
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