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	Wetting Rate and Rain Depth Effects on Crust Strength and Micromorphology
	Fan Y. ; Lei T. ; Shainberg I. ; Cai Q.
	2008
关键词	interrill soil-erosion seal formation aggregate stability rainsplash erosion prewetting rate loess soils infiltration energy sodicity water
英文摘要	Aggregate disintegration and crust formation at soil surfaces exposed to rain are caused by rapid wetting of the dry aggregates and by raindrop impact. The relative importance of these two mechanisms was evaluated by studying the effects of the wetting rate (WR) and raindrop impact on crust strength and crust micromorphology. Two soils, a loess (Typic Haplustalf) and a black soil (Pachic Udic Argiboroll), varying in their organic matter content (15.2 and 42.6 g kg(-1), respectively) and aggregate stabilities, were packed in splash cups, prewetted at WRs of 2 or 50 mm h(-1), and exposed to 5 to 60 nun of simulated rainfall. For the unstable loess sod, crust strength increased and crust micro-fabric deteriorated with increases in cumulative rainfall but were unaffected by the WR. Conversely, in the black sod with high aggregate stability, changes in crust strength and crust microfabric were affected by the WR; for the slow WR, both phenomena were largely unaffected by increases in cumulative rainfall but, for the Faster WR, the phenomena were greatly affected by rain depth and crust formation proceeded rapidly. Both WR and raindrop impacts affect surface aggregate breakdown and crust formation. The energy released by slaking while wetting dry aggregates is, however, considerably higher than that of raindrop impact. Thus, the relative importance of WR and rain depth depends on the stability of the soil aggregates. For soils with stable aggregates, raindrop impact alone is not sufficient to destroy aggregates and form crusts. Rapid wetting of the dry soil is essential for aggregate breakdown and crust formation. For soils with unstable aggregates, the energy of raindrop impact is sufficient for seal formation.
出处	Soil Science Society of America Journal
卷	72
期	6
页	1604-1610
收录类别	SCI
语种	英语
ISSN号	0361-5995
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/24075]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Fan Y.,Lei T.,Shainberg I.,et al. Wetting Rate and Rain Depth Effects on Crust Strength and Micromorphology. 2008.

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