Arid
DOI10.1071/SR07168
Effect of soil wetting conditions on seal formation, runoff, and soil loss in arid and semiarid soils - a review
Ben-Hur, Meni1; Lado, Marcos2
通讯作者Ben-Hur, Meni
来源期刊AUSTRALIAN JOURNAL OF SOIL RESEARCH
ISSN0004-9573
EISSN1446-568X
出版年2008
卷号46期号:3页码:191-202
英文摘要

Soil surface sealing is one of the main causes for low infiltration rate (IR) and high runoff and soil loss under raindrop impact conditions in arid and semiarid regions. Many studies have focused on the effects of soil properties on seal formation under fast wetting conditions. However, in the field, soils can be exposed to different wetting conditions, before an intense rainfall event, which can affect the role of the soil properties on seal formation. The present paper reviews the effects of different initial wetting conditions and their interactions with soil properties on seal formation, IR, runoff, and soil loss in smectitic soils. Fast wetting of soil causes aggregate slaking, which enhances seal formation, runoff, and soil loss under rainfall, mainly in soils with >40% clay content. An increase in clay content of the soil increases aggregate strength, but at the same time increases the slaking forces. Hence, in soils with low clay content (<40%) and low aggregate stability, raindrop impact alone was sufficient to break down the aggregates and to develop a seal. In contrast, in soils with >40% clay content and high aggregate stability, slaking plays an important role in aggregate breakdown and seal formation. An increase of raindrop kinetic energy, from 8 to 15.9 kJ/m(3), decreased the effect of the slaking forces on seal formation and runoff. It was suggested that the effects of raindrop kinetic energy and of the slaking forces on aggregate disintegration and seal formation are complementary. An increase in soil exchangeable sodium percentage (ESP), from 0.9 to 20.4%, decreased the effect of slaking forces on seal formation and runoff production under rainfall with 15.9 kJ/m(3) kinetic energy. Probably, increasing the ESP increased the soil dispersivity, and therefore diminished the effect of the slaking forces on aggregate disintegration and seal formation. Aging (the time since wetting) of soil increased the stability of soil structure, decreased the seal formation, maintained high IR, and diminished soil loss amounts. These effects of soil aging depend on both the prewetting rate of the soil and soil texture.


类型Review
语种英语
国家Israel ; Spain
收录类别SCI-E
WOS记录号WOS:000255443400001
WOS关键词SCANNING-ELECTRON-MICROSCOPE ; ORGANIC-MATTER CONTENT ; AGGREGATE STABILITY ; RAINDROP-IMPACT ; INFILTRATION-RATE ; LOESS SOILS ; WATER ; TEXTURE ; ERODIBILITY ; MINERALOGY
WOS类目Soil Science
WOS研究方向Agriculture
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/156616
作者单位1.ARO, Inst Soil Water & Environm Sci, Volcani Ctr, IL-50250 Bet Dagan, Israel;
2.Univ A Coruna, Area Soil Sci, Fac Sci, Acoruna 15071, Spain
推荐引用方式
GB/T 7714
Ben-Hur, Meni,Lado, Marcos. Effect of soil wetting conditions on seal formation, runoff, and soil loss in arid and semiarid soils - a review[J],2008,46(3):191-202.
APA Ben-Hur, Meni,&Lado, Marcos.(2008).Effect of soil wetting conditions on seal formation, runoff, and soil loss in arid and semiarid soils - a review.AUSTRALIAN JOURNAL OF SOIL RESEARCH,46(3),191-202.
MLA Ben-Hur, Meni,et al."Effect of soil wetting conditions on seal formation, runoff, and soil loss in arid and semiarid soils - a review".AUSTRALIAN JOURNAL OF SOIL RESEARCH 46.3(2008):191-202.
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