干旱区生态环境知识资源中心(Arid): Soil physical degradation and rill detachment by raindrop impact in semi-arid region

Arid

DOI	10.1016/j.catena.2021.105603
	Soil physical degradation and rill detachment by raindrop impact in semi-arid region
	Sadeghian, N.; Vaezi, A. R.; Majnooniheris, A.; Cerda, A.
通讯作者	Sadeghian, N ; Vaezi, AR (corresponding author), Univ Zanjan, Agr Fac, Dept Soil Sci, Zanjan 4537138791, Iran.
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2021
卷号	207
英文摘要	Tillage along slopes creates furrows similar to rills which exposes the soil surface directly to raindrop impact (RI) especially in semi-arid regions. In order to quantify the effect of RI on soil physical degradation and rill detachment we determined the change of soil aggregate stability, bulk density, surface resistance and rill detachment in semi-arid soils. Toward these some dominant soils including silt, silty clay, clay, sandy clay and loamy sand were exposed under rainfall impact at four slope gradients (5, 10, 15 and 20%). The laboratory experiments were set up at two soil surface conditions: with and without RI in a flume under simulated rainfalls with an intensity of 90 mm h 1. Four rills with parabolic cross sections, 10 cm width and 4 m length were installed along the flume. Results indicated that the soils are physically degraded (aggregate breakdown, soil compaction and surface resistance) by RI. The rate of physical degradation processes was significantly influenced by the soil type and slope gradient. The soils with higher water-stable aggregates such as sandy clay showed lower physical degradation symptoms. The susceptibility of these soils to physical degradation processes increased with increasing slope gradient. Soil detachment through concentrated flow under RI was affected by the soil physical degradation rate, which in turn was controlled by the two variables i.e. soil type and slope gradient. However the direct effect of RI act in rill detachment (rainfall-driven force) increased rill detachment. As a conclusion, the rill detachment showed higher dependency to RI than soil physical degradation processes. This study revealed that the importance of maintaining the soil surface cover for controlling the negative effects of RI in the soil physical degradation as well as rill detachment especially in semi-arid soils with lower aggregate stability and under steep slopes.
英文关键词	Aggregate breakdown Soil compaction Soil surface resistance Soil texture Structure stability
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000703268900028
WOS关键词	AGGREGATE STABILITY ; SPLASH EROSION ; INTERRILL EROSION ; LOESS PLATEAU ; PENETRATION RESISTANCE ; RAINFALL INTENSITY ; SLOPE GRADIENT ; WATER EROSION ; GULLY EROSION ; RUNOFF
WOS类目	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向	Geology ; Agriculture ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/362818
作者单位	[Sadeghian, N.; Vaezi, A. R.] Univ Zanjan, Agr Fac, Dept Soil Sci, Zanjan 4537138791, Iran; [Majnooniheris, A.] Univ Tabriz, Fac Agr, Dept Water Engn, Tabriz, Iran; [Cerda, A.] Univ Valencia, Soil Eros & Degradat Res Grp, Dept Geog, BlascoIbanez 28, Valencia 46010, Spain
推荐引用方式 GB/T 7714	Sadeghian, N.,Vaezi, A. R.,Majnooniheris, A.,et al. Soil physical degradation and rill detachment by raindrop impact in semi-arid region[J],2021,207.
APA	Sadeghian, N.,Vaezi, A. R.,Majnooniheris, A.,&Cerda, A..(2021).Soil physical degradation and rill detachment by raindrop impact in semi-arid region.CATENA,207.
MLA	Sadeghian, N.,et al."Soil physical degradation and rill detachment by raindrop impact in semi-arid region".CATENA 207(2021).