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Soil resistance to flowing water erosion of seven typical plant communities on steep gully slopes on the Loess Plateau of China
Zhang, Bao-jun1; Zhang, Guang-hui1,2; Yang, Han-yue2; Wang, Hao2
2019-02-01
Source PublicationCATENA
ISSN0341-8162
Volume173Pages:375-383
Corresponding AuthorZhang, Guang-hui(ghzhang@bnu.edu.cn)
AbstractSteep 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.
KeywordSoil erosion Rill erodibility Critical shear stress Steep gully slope The Loess Plateau
DOI10.1016/j.catena.2018.10.036
WOS KeywordDIFFERENT LAND USES ; OVERLAND-FLOW ; CONCENTRATED FLOW ; DETACHMENT CAPACITY ; RILL ERODIBILITY ; SURFACE CHARACTERISTICS ; TEMPORAL VARIATION ; EPHEMERAL GULLIES ; SMALL CATCHMENT ; ROOTS
Indexed BySCI
Language英语
Funding ProjectNational Key R&D Program of China[2017YFC0504702] ; State Key Program of National Natural Science of China[41530858]
Funding OrganizationNational Key R&D Program of China ; State Key Program of National Natural Science of China
WOS Research AreaGeology ; Agriculture ; Water Resources
WOS SubjectGeosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS IDWOS:000452814300036
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/51328
Collection中国科学院地理科学与资源研究所
Corresponding AuthorZhang, Guang-hui
Affiliation1.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
Recommended Citation
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.
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