Soil resistance to flowing water erosion of seven typical plant communities on steep gully slopes on the Loess Plateau of China

doi:10.1016/j.catena.2018.10.036

	Soil resistance to flowing water erosion of seven typical plant communities on steep gully slopes on the Loess Plateau of China
	Zhang, Bao-jun 1; Zhang, Guang-hui 1,2; Yang, Han-yue 2; Wang, Hao 2
刊名	CATENA
	2019-02-01
卷号	173 页码:375-383
关键词	Soil erosion Rill erodibility Critical shear stress Steep gully slope The Loess Plateau
ISSN号	0341-8162
DOI	10.1016/j.catena.2018.10.036
通讯作者	Zhang, Guang-hui(ghzhang@bnu.edu.cn)
英文摘要	Steep gully slopes are widespread and have been recognized as the main sediment source on the Loess Plateau. Different vegetation growth may lead to the differences in soil properties and plant roots, and thus likely affects soil resistance to flowing water erosion, reflected by rill erodibility and critical shear stress. However, few studies have been conducted to evaluate this effect on steep gully slopes on the Loess Plateau of China. This study was performed to investigate the effects of vegetation growth on soil resistance to flowing water erosion on steep gully slopes, and quantify the main potential influencing factors on the Loess Plateau. Three typical shrub communities and four typical grass communities that distributed on different gully slopes were selected. 240 undisturbed soil samples were collected from these seven gully slope lands and one slope farmland (control), and were subjected to detachment by overland flow under six different shear stresses (6.64 to 17.85 Pa). The results showed that the mean detachment capacity of slope farmland was 6.9 to 47.8 times greater than those of steep gully slopes covered with different plant communities. The rill erodibilities of steep gully slopes covered with different plant communities reduced greatly by 77.0% to 95.1% compared to the control slope. The critical shear stress of slope farmland (2.72 Pa) was only 57.2% and 39.6% of that of shrubland (4.76 Pa) and grassland (6.88 Pa). Both shrub and grass communities were effective in reducing soil detachment capacity and rill erodibility, and increasing critical shear stress on steep gully slopes. But the effects were more obvious for the grass communities. The differences in rill erodibility between slope farmland and gully slope lands were mainly explained by the changes in root mass density (82.4%). Plant roots had strong direct effects on increasing soil cohesion (0.78), organic matter content (0.56), and water stable aggregation (0.92). Rill erodibility was negatively related to root mass density as an exponential function (p < 0.05), and soil cohesion and water stable aggregation as power functions (p < 0.05). Critical shear stress was positively related to root mass density and soil water stable aggregation following a logarithmic function.
资助项目	National Key R&D Program of China[2017YFC0504702] ; State Key Program of National Natural Science of China[41530858]
WOS关键词	DIFFERENT LAND USES ; OVERLAND-FLOW ; CONCENTRATED FLOW ; DETACHMENT CAPACITY ; RILL ERODIBILITY ; SURFACE CHARACTERISTICS ; TEMPORAL VARIATION ; EPHEMERAL GULLIES ; SMALL CATCHMENT ; ROOTS
WOS研究方向	Geology ; Agriculture ; Water Resources
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000452814300036
资助机构	National Key R&D Program of China ; State Key Program of National Natural Science of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/51327]
专题	中国科学院地理科学与资源研究所
通讯作者	Zhang, Guang-hui
作者单位	1.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Fanning Loess P, Yangling 712100, Shaanxi, Peoples R China 2.Beijing Normal Univ, Fac Geog Sci, Beijing 100875, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Bao-jun,Zhang, Guang-hui,Yang, Han-yue,et al. Soil resistance to flowing water erosion of seven typical plant communities on steep gully slopes on the Loess Plateau of China[J]. CATENA,2019,173:375-383.
APA	Zhang, Bao-jun,Zhang, Guang-hui,Yang, Han-yue,&Wang, Hao.(2019).Soil resistance to flowing water erosion of seven typical plant communities on steep gully slopes on the Loess Plateau of China.CATENA,173,375-383.
MLA	Zhang, Bao-jun,et al."Soil resistance to flowing water erosion of seven typical plant communities on steep gully slopes on the Loess Plateau of China".CATENA 173(2019):375-383.