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Liu Y.-J.,Huazhong Agricultural University | Liu Y.-J.,Jiangxi Provincial Key Laboratory of Soil Erosion and Prevention | Liu Y.-J.,CAS Institute of Soil and Water Conservation | Hu J.-M.,Jiangxi Provincial Key Laboratory of Soil Erosion and Prevention | And 5 more authors.
Catena | Year: 2016

Roads play a significant role in altering hydrological processes. Roads cause more erosion to be generated from the hillslope for both road-concentrated flow and rainfall. In this study, six treatments (Natural Restoration, Grass, Grass & Shrub, Sodded Strip, Grass & Farmland, and Farmland) were used to recolonize hillslope plants on a newly built unpaved road. Rainfall simulation (rainfall intensity of 90mmh-1 and 120mmh-1) and scouring simulation (scouring flow rate 15Lmin-1 and 20Lmin-1) tests were conducted to identify the effects of plants on soil erosion. In the rainfall simulation test, Grass & Shrub was more effective at reducing hillslope erosion than the other treatments, and Grass & Shrub also had a lower runoff coefficient, soil detachment rate, and higher efficiency in trapping runoff and sediment. The hydrological responses of all of the tested plots in the scouring test were much faster than in the rainfall simulation, as indicated by the lower lag time to runoff generation. The hillslope erosion in the scouring test was significantly higher than in the rainfall simulation. The water-stable aggregate, saturated hydraulic conductivity, vegetation cover, root length density, and root weight density were important factors that conditioned the runoff generation and sediment yield from the hillslope in both experimental tests. In the scouring test, in infiltration improvement and flow erosivity reduction, Grass was more effective at trapping runoff and sediment because of its dense well-developed system of fine roots. Therefore, except for an immediate surface cover, in the areas where the hillslope has a risk of road-concentrated flow scouring, the enhancement of topsoil roughness was also very important in weakening the impact of road-concentrated flow on the hillslope. © 2015 Elsevier B.V. Source


Liu Y.-J.,Huazhong Agricultural University | Liu Y.-J.,Jiangxi Provincial Key Laboratory of Soil Erosion and Prevention | Liu Y.-J.,CAS Institute of Soil and Water Conservation | Hu J.-M.,Jiangxi Provincial Key Laboratory of Soil Erosion and Prevention | And 5 more authors.
Catena | Year: 2015

Roads play a significant role in altering hydrological processes. Roads cause more erosion to be generated from the fillslope for both road-concentrated flow and rainfall. In this study, six treatments (Natural Restoration, Grass, Grass & Shrub, Sodded Strip, Grass & Farmland, and Farmland) were used to recolonize fillslope plants on a newly built unpaved road. Rainfall simulation (rainfall intensity of 90mmh-1 and 120mmh-1) and scouring simulation (scouring flow rate 15Lmin-1 and 20Lmin-1) tests were conducted to identify the effects of plants on soil erosion. In the rainfall simulation test, Grass & Shrub was more effective at reducing fillslope erosion than the other treatments, and Grass & Shrub also had a lower runoff coefficient, soil detachment rate, and higher efficiency in trapping runoff and sediment. The hydrological responses of all of the tested plots in the scouring test were much faster than in the rainfall simulation, as indicated by the lower lag time to runoff generation. The fillslope erosion in the scouring test was significantly higher than in the rainfall simulation. The water-stable aggregate, saturated hydraulic conductivity, vegetation cover, root length density, and root weight density were important factors that conditioned the runoff generation and sediment yield from the fillslope in both experimental tests. In the scouring test, in infiltration improvement and flow erosivity reduction, Grass was more effective at trapping runoff and sediment because of its dense well-developed system of fine roots. Therefore, except for an immediate surface cover, in the areas where the fillslope has a risk of road-concentrated flow scouring, the enhancement of topsoil roughness was also very important in weakening the impact of road-concentrated flow on the fillslope. © 2015 Elsevier B.V. Source


Liu Y.-J.,Jiangxi Provincial Key Laboratory of Soil Erosion and Prevention | Liu Y.-J.,CAS Institute of Soil and Water Conservation | Yang J.,Jiangxi Provincial Key Laboratory of Soil Erosion and Prevention | Yang J.,CAS Institute of Soil and Water Conservation | And 6 more authors.
Journal of Hydrology | Year: 2016

Land cover and rainfall regime are two important factors that affect soil erosion. In this paper, three land cover types – grass cover, litter cover and bare land – were employed to analyze surface runoff, subsurface flow and sediment loss processes in relation to the rainfall regimes in the red soil region of China. Five rainfall regimes were classified according to 393 rainfall events via a k-means clustering method based on the rainfall depth, duration and maximum 30-min intensity. The highest surface runoff coefficient and erosion amount were found on bare land in all five rainfall regimes, and the lowest were found on grass cover. The litter cover generated the highest subsurface flow rate, followed by the grass cover; the lowest was on bare land. For grass cover and litter cover plots, rainfall events of rainfall regime IV which had the longest duration, greatest depth and lowest intensity had the highest surface runoff coefficient, soil erosion amount and subsurface flow rate. For bare land, storm rainfall events of rainfall regime V had the highest intensity, lowest depth and duration, had the highest surface runoff coefficient and soil erosion amount, but the lowest subsurface flow rate. The highest subsurface flow rate of bare land happened in rainfall regime IV. Surface cover was urgently needed to reduce soil erosion. When the lands under dense surface cover, more attention should be paid to rainfall events that of long duration, high depth but low in intensity which commonly occurred in spring. The interactions of surface–subsurface flow and its effects on soil erosion and nutrient loss were worth considering in the red soil region. © 2016 Elsevier B.V. Source


Zheng H.,Jiangxi Provincial Key Laboratory of Soil Erosion and Prevention | Zheng H.,CAS Institute of Soil and Water Conservation | Yang J.,Jiangxi Provincial Key Laboratory of Soil Erosion and Prevention | Yang J.,CAS Institute of Soil and Water Conservation | And 8 more authors.
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | Year: 2016

The study is aimed to identify the law of how soil property and peanut growth respond to soil and water conservation (SWC) tillage in order to provide a scientific basis for preventing soil erosion, improving soil fertility and increasing peanut yield in red soil sloping land. The impacts of three types of SWC tillage practices, namely vetiver grass hedgerows (VH), straw mulching (SM) and vetiver grass hedgerows plus straw mulching (VH+SM), on soil property and peanut yield were examined and compared with conventional tillage (CT) through a long-term located experiment in sloping land of red soil. Results showed that after five years of the experiment, VH+SM and SM treatments could still promote the growth of stem, leaf, root and fruit of its in peanut flowering and podding periods, and created significant peanut yield increments of 460.65 kg/hm2 and 761.11 kg/hm2 with increasing rates of 6.19% and 20.32%, respectively, compared with CT. Although VH treatment had no obvious influence on promoting peanut growth and yield, its effect on reducing erosion was remarkable, and thus its comprehensive benefit were still better than that of CT. The three SWC tillage practices all improved the chemical properties of soil to some extent compared with CT. Among them, VH+SM treatment exhibited the best performance, and increased the soil organic matter, total nitrogen and available phosphorus contents by 36.81%, 64.03%, and 43.50%, respectively. Under VH+SM tillage practice, the soil microaggregate (with diameter less than 2 μm) content and the total amount of main microbial population were significantly higher than those under CT, indicating that soil physical structure and microbial activity were improved. Hence, the SWC tillage practices were fit for sustainable agricultural development in arid sloping land of red soil in South China. Especially, the combination mode of vetiver grass hedgerows plus straw mulching had outstanding effect on improving soil quality and crop yield. © 2016, Chinese Society of Agricultural Machinery. All right reserved. Source

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