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	Effects of wetting rate and simulated rain duration on soil crust formation of red loam
	Han Y. G.; Fan, Y. T.; Xin, Z. B.; Wang, L.; Cai, Q. G.; Wang, X. Y.
	2016
关键词	Wetting rate Cumulative rainfall Soil surface strength Micromorphological picture Soil crust rainsplash erosion seal formation infiltration impact energy china micromorphology detachment mineralogy strength
英文摘要	The characteristics of crusts are closely related to soil erosion in red loam under a rainfall condition. To better manage crust-prone soils and to accurately predict hydrological processes, it is necessary to understand the mechanism of crust formation. Wetting rate is an important factor influencing soil aggregate stability and crust formation. In this study, we considered two factors, wetting rate (slow 2 mm h(-1), fast 50 mm h(-1)) and rainfall quantity (intensity of 60 mm h(-1) with every 5 min as a treatment from 0 to 60 min). The results show that soil in the fast wetting treatment had higher bulk density, stronger crust strength and lower infiltration rate. Therefore, the fast wetting treatment had higher ability to resist the damage caused by raindrops and to resist soil erosion, and higher runoff rate than slow wetting treatment. Crust formation-destruction-formation process appeared sharp in fast wetting treatment but gentle in slow wetting treatment. Surface morphology and profile microstructure show that crusts were formed earlier in fast wetting treatment. The aggregates in slow wetting treatment had higher stability than those in fast wetting treatment. The crust strength of the soil pretreated by slow wetting was weaker than that in fast wetting case due to the persistent presence of stable aggregates, albeit microaggregates, and, consequently, reduced levels of compaction.
出处	Environmental Earth Sciences
卷	75
期	2
语种	英语
ISSN号	1866-6280
DOI标识	10.1007/s12665-015-4901-x
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/42968]
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	Han Y. G.,Fan, Y. T.,Xin, Z. B.,et al. Effects of wetting rate and simulated rain duration on soil crust formation of red loam. 2016.

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