Exploring the interaction of surface roughness and slope gradient in controlling rates of soil loss from sloping farmland on the Loess Plateau of China

2019 ◽  
Vol 34 (2) ◽  
pp. 339-354
Author(s):  
Taotao Li ◽  
Longshan Zhao ◽  
Hongteng Duan ◽  
Yifan Yang ◽  
Yu Wang ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Loess Plateau ◽  
Soil Loss ◽  
Slope Gradient ◽  
The Loess Plateau ◽  
Sloping Farmland

scholarly journals Assessment of the Soil Erosion Response to Land Use and Slope in the Loess Plateau—A Case Study of Jiuyuangou

Water ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 529 ◽  
Author(s):  
Chenlu Huang ◽  
Qinke Yang ◽  
Xiayu Cao ◽  
Yuru Li
Keyword(s):  
Land Use ◽  
Soil Erosion ◽  
Loess Plateau ◽  
Soil Loss ◽  
Yellow River ◽  
Slope Gradient ◽  
The Loess Plateau ◽  
Annual Average ◽  
Management Procedures ◽  
The Impact

Soil erosion is a serious environmental problem in the Loess Plateau, China. Therefore, it is important to understand and evaluate soil erosion process in a watershed. In this study, the Chinese Soil Loss Equation (CSLE) is developed to evaluate the soil loss and analyze the impact of land use and slope on soil erosion in Jiuyuangou (JYG) watershed located in the hilly-gullied loess region of China 1970–2015. The results show that the quantities of soil erosion decreased clearly from 1977 to 2015 in the study area, which from 2011 (t/km²·a) in 1977 to 164 (t/km²·a) in 2004 and increased slowly to 320 (t/km²·a) in 2015. No significant soil erosion (<300 t/km²·a) changed in JYG watershed, which increased dramatically from 8.93% to 69.34% during 1977–2015. The area of farmland in this study area has been reduced drastically. Noting that the annual average soil erosion modulus of grassland was also showing a dropped trend from 1977 to 2015. In addition, the study shows that the annual average soil erosion modulus varied with slope gradient and the severe soil erosion often existed in the slope zone above 25°, which accounted for 4657 (t/km²·a) in 1977 and 382.27 (t/km²·a) in 2015. Meanwhile, soil erosion of different land-use types presented the similar changing trend (declined noticeably and then increased slowly) with the change of slope gradient from 1977 to 2015. Combined the investigations of extreme rainfall on 26 July 2015 for JYG watershed, the study provides the scientific support for the implementation of soil and water conservation measures to reduce the soil erosion and simplify Yellow River management procedures.

scholarly journals Spatial heterogeneity of surface roughness on tilled loess slopes in erosion stages

2018 ◽  
Vol 13 (No. 2) ◽  
pp. 90-97
Author(s):  
Q. Zhang ◽  
J. Wang ◽  
F. Wu
Keyword(s):  
Surface Roughness ◽  
Spatial Heterogeneity ◽  
Loess Plateau ◽  
Chinese Loess Plateau ◽  
Strengthening Effect ◽  
Methodological Framework ◽  
Rill Erosion ◽  
Slope Gradient ◽  
Chinese Loess ◽  
Relief Effect

The main soil erosion areas of the Chinese Loess Plateau are tilled slopes. The knowledge of their spatial heterogeneity will contribute to the understanding of erosion mechanisms on a microtopographic scale. In this study, the spatial heterogeneity of four conventionally tilled slopes was examined under simulated rainfall conditions using a semivariogram-based methodological framework. Results show that all tilled slopes have a relatively stable spatial structure and the erosion stages of all tilled slopes have a similar spatial variability. The rainfall in the splash, sheet, and rill erosion stages has a degree of relief effect, strengthening effect, and relief effect on the surface roughness, respectively. However, the effects of tillage practices and slope gradient on the spatial heterogeneity are much larger than those of the rainfall. The spatial heterogeneity decreases with increasing slope gradient. The general autocorrelation scale of the tilled slopes is 3.15 m and their fractal dimension ranges from 1.59 to 1.85. The tilled slopes have certain anisotropy with respect to the slope direction from 10° to 22.5° while they show isotropy or weaker anisotropy in other directions. In this work, a semivariogram-based methodological framework was established for the spatial heterogeneity of microtopographic-scale slopes. The results also provide a theoretical foundation for future tillage measures on sloping fields of the Loess Plateau.

scholarly journals Soil surface roughness change and its effect on runoff and erosion on the Loess Plateau of China

2013 ◽  
Vol 6 (4) ◽  
pp. 400-409 ◽  
Author(s):  
LongShan Zhao ◽  
XinLan Liang ◽  
FaQi Wu
Keyword(s):  
Surface Roughness ◽  
Loess Plateau ◽  
Soil Surface ◽  
The Loess Plateau ◽  
Roughness Change ◽  
Soil Surface Roughness

Soil Surface Roughness Effects on Infiltration Process of a Cultivated Slopes on the Loess Plateau of China

2013 ◽  
Vol 27 (14) ◽  
pp. 4759-4771 ◽  
Author(s):  
Longshan Zhao ◽  
Linhua Wang ◽  
Xinlan Liang ◽  
Jian Wang ◽  
Faqi Wu
Keyword(s):  
Surface Roughness ◽  
Loess Plateau ◽  
Soil Surface ◽  
The Loess Plateau ◽  
Roughness Effects ◽  
Infiltration Process ◽  
Soil Surface Roughness

Combined effects of rainfall regime and plot length on runoff and soil loss in the Loess Plateau of China

2018 ◽  
Vol 109 (3-4) ◽  
pp. 397-406
Author(s):  
Jianbo LIU ◽  
Guangyao GAO ◽  
Shuai WANG ◽  
Bojie FU
Keyword(s):  
Loess Plateau ◽  
Soil Loss ◽  
Rainfall Regime ◽  
Runoff Coefficient ◽  
Land Uses ◽  
The Loess Plateau ◽  
Slope Length ◽  
Erosive Rainfall ◽  
Runoff And Soil Loss ◽  
Rainfall Regimes

ABSTRACTThe purpose of this paper was to study the interaction effects of rainfall regime and slope length on runoff and soil loss under different land uses. Event runoff and soil loss in forest, shrub and grass were measured in plots with lengths of 5, 9 and 13m in the Loess Plateau from 2008 to 2016. A total of 59 erosive rainfall events were recorded and classified into three rainfall regimes. Firstly, the results showed that the runoff coefficient was grass>shrub>forest, and soil loss was grass>forest>shrub, but the differences between forest and shrub in runoff and between grass and forest in soil loss did not reach significant levels. Secondly, rainfall regimes had an important effect on runoff and soil loss under different land uses. The lowest runoff coefficients and the highest soil loss in regime 2 were found in shrub and forest land, respectively, which differed from that of regime 1. In total, rainfall regime 1 had the highest runoff coefficient of 0.84–2.06%, followed by regime 3 with 0.33–0.88% and regime 2 with 0.04–0.06%. Soil loss in forest and grass land had a different order of regime 3>regime 1>regime 2. Thirdly, both the runoff coefficient and soil loss decreased with increasing plot length, while the effect of slope length on runoff/soil loss were influenced by land use type and rainfall regimes.

The relative importance of soil crust and slope angle in runoff and soil loss: a case study in the hilly areas of the Loess Plateau, North China

GeoJournal ◽  
2008 ◽  
Vol 71 (2-3) ◽  
pp. 117-125 ◽  
Author(s):  
Qinjuan Cheng ◽  
Wenjun Ma ◽  
Qiangguo Cai
Keyword(s):  
Loess Plateau ◽  
Soil Loss ◽  
North China ◽  
Slope Angle ◽  
Relative Importance ◽  
Soil Crust ◽  
The Loess Plateau ◽  
Runoff And Soil Loss

scholarly journals Capacity of soil loss control in the Loess Plateau based on soil erosion control degree

2016 ◽  
Vol 26 (4) ◽  
pp. 457-472 ◽  
Author(s):  
Haidong Gao ◽  
Zhanbin Li ◽  
Lianlian Jia ◽  
Peng Li ◽  
Guoce Xu ◽  
...  
Keyword(s):  
Soil Erosion ◽  
Loess Plateau ◽  
Soil Loss ◽  
Erosion Control ◽  
The Loess Plateau ◽  
Soil Erosion Control ◽  
Control Degree ◽  
Loss Control

Variation in soil surface roughness under different land uses in a small watershed on the Loess Plateau, China

CATENA ◽  
2020 ◽  
Vol 188 ◽  
pp. 104465 ◽  
Author(s):  
Ping-zong Zhu ◽  
Guang-hui Zhang ◽  
Bao-jun Zhang ◽  
Hong-xiao Wang
Keyword(s):  
Surface Roughness ◽  
Loess Plateau ◽  
Soil Surface ◽  
Land Uses ◽  
Small Watershed ◽  
The Loess Plateau ◽  
Soil Surface Roughness

scholarly journals Coupling the modified SCS-CN and RUSLE models to simulate hydrological effects of restoring vegetation in the Loess Plateau of China

2012 ◽  
Vol 9 (3) ◽  
pp. 4193-4233 ◽  
Author(s):  
G. Y. Gao ◽  
B. J. Fu ◽  
Y. H. Lü ◽  
Y. Liu ◽  
S. Wang ◽  
...  
Keyword(s):  
Loess Plateau ◽  
Soil Loss ◽  
Curve Number ◽  
Rainfall Runoff ◽  
The Loess Plateau ◽  
Rusle Model ◽  
Initial Abstraction ◽  
Runoff And Soil Loss ◽  
Scs Cn ◽  
Runoff Production

Abstract. Predicting event runoff and soil loss under different land covers is essential to quantitatively evaluate the hydrological responses of vegetation restoration in the Loess Plateau of China. The Soil Conservation Service Curve Number (SCS-CN) and Revised Universal Soil Loss Equation (RUSLE) models are widely used in this region to this end. This study incorporated antecedent moisture condition (AMC) in runoff production and initial abstraction of the SCS-CN model, and considered the direct effect of runoff on event soil loss by adopting a rainfall-runoff erosivity factor in the RUSLE model. The modified SCS-CN and RUSLE models were coupled to link rainfall-runoff-erosion modeling. The effects of AMC, slope gradient and initial abstraction ratio on curve number of SCS-CN, as well as those of vegetation cover on cover-management factor of RUSLE were also considered. Three runoff plot groups covered by sparse young trees, native shrubs and dense tussock, respectively, were established in the Yangjuangou catchment of Loess Plateau. Rainfall, runoff and soil loss were monitored during the rainy season in 2008–2011 to test the applicability of the proposed approach. The original SCS-CN model significantly underestimated the event runoff, especially for the rainfall events that have large 5-day antecedent precipitation, whereas the modified SCS-CN model could predict event runoff well with Nash-Sutcliffe model efficiency (EF) over 0.85. The original RUSLE model overestimated low values of measured soil loss and under-predicted the high values with EF only about 0.30. In contrast to it, the prediction accuracy of the modified RUSLE model improved satisfactorily with EF over 0.70. Our results indicated that the AMC should be explicitly incorporated in runoff production, and direct consideration of runoff should be included in predicting event soil loss. Coupling the modified SCS-CN and RUSLE models appeared to be appropriate for runoff and soil loss simulation at plot scale in the Loess Plateau. The limitations and future study scopes of the proposed models were also indicated.

Variation in land surface roughness under typical plant communities on steep gully slopes on the Loess Plateau of China

CATENA ◽  
2021 ◽  
Vol 206 ◽  
pp. 105549
Author(s):  
Pingzong Zhu ◽  
Guanghui Zhang ◽  
Chengshu Wang ◽  
Lili Wang
Keyword(s):  
Surface Roughness ◽  
Loess Plateau ◽  
Plant Communities ◽  
Land Surface ◽  
The Loess Plateau
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