Exploring optimal measures to reduce soil erosion and nutrient losses in southern China

Dai, Cuiting; Liu, Yaojun; Wang, Tianwei; Li, Zhaoxia; Zhou, Yiwen

doi:10.1016/j.agwat.2018.07.032

Cited by 62 publications

(28 citation statements)

References 47 publications

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“…Therefore, planting plants on slopes can significantly reduce the MWD in eroded sediment, and different soil and water conservation measures can further reduce the MWD in eroded sediment ( Figure 10). A contour tillage ditch on a slope can slow down the surface runoff, and runoff can even be stored in the ditch even under light rain, so that coarse particles are deposited in the ditch [62,63]. In contrast, straw mulch can more effectively intercept coarse particles [61]; this outcome is similar to the results of this study.…”

Section: Discussionsupporting

confidence: 86%

Effects of Soil and Water Conservation Measures on Runoff and Sediment Yield in Red Soil Slope Farmland under Natural Rainfall

et al. 2020

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This paper analyzes the relationship between runoff, soil erosion, sediment particles, and natural rainfall characteristics on sloping farmland in the red soil region of southern China. The surface runoff and soil loss data were measured on runoff plots during 66 natural rainfall events from 2015 to 2018 in Jiangxi Province. The results show that the maximum 30-min rainfall intensity (I 30 ) is positively related to the runoff depth, soil erosion modulus, and sediment mean weight diameter (MWD). With the increase in I 30 during rainfall, the coarse sand content increases, and the fine sand content decreases. The average annual runoff of slope tillage, hedgerows with slope tillage, straw mulching with conventional tillage, and contour tillage decreased by 32.56%, 65.87%, 83.99%, and 87.30%, respectively, compared with that of bare land. Soil and water conservation measures can significantly reduce slope runoff. The flow-reduction effect of contour tillage and straw mulching with conventional tillage increases as I 30 increases, and the flow-reduction effect of hedgerows with slope tillage first increases and then decreases as I 30 increases. The coefficients of variation and standard deviations of the flow-reduction effects of different soil and water conservation measures decrease with increasing I 30 . The average annual soil erosion moduli of slope tillage, hedgerows with slope tillage, contour tillage, and straw mulching with conventional tillage decreased by 59.33%, 91.29%, 97.17%, and 98.45%, respectively, compared with that of bare land. Soil and water conservation measures can significantly reduce the sediment yield on slopes. The flow-reduction effects of hedgerows with slope tillage, contour tillage, and straw mulching with conventional tillage all increase with I 30 , and their coefficients of variation and standard deviations decrease with I 30 . The average single rainfall erosion sediment MWD of decreased by 5.91%, 8.33%, 9.69%, and 13.32%, respectively, compared with that of bare land. Straw mulching with conventional tillage can significantly reduce the MWD of erosion sediment, effectively reduce the content of coarse sand, and increase the content of fine sand. Straw mulching with conventional tillage is a very good soil and water conservation measure for sloping farmland. It not only has the best effect on reducing flow and sediment, but also can effectively intercept coarse sand and reduce the MWD of erosion sediment.

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Section: Discussionsupporting

confidence: 86%

Effects of Soil and Water Conservation Measures on Runoff and Sediment Yield in Red Soil Slope Farmland under Natural Rainfall

et al. 2020

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“…1), and the soil conditions among them were similar. Each plot was 20 m × 5 m (length × width), and details of the runoff plot design were shown by Dai et al (2018). In HT plots, day-lily hedgerows were constructed by transplanting seedlings on October 26, 2011.…”

Section: Experimental Designmentioning

confidence: 99%

“…An erosive rain event occurred when rainfall resulted in the generation of soil and water loss at an interval of less than 6 h. A total of 264 erosion observations were recorded during the entire experiment. Surface runoff volume was calculated according to a pre-determined water level-volume ratio using a water-level gauge installed in a runoff bucket; sediment concentration in the runoff was calculated using the drying method after collecting a water sample from the runoff bucket after thorough mixing; eroded sediment amount was calculated according to total surface runoff volume (Dai et al 2018). Precipitation was recorded using an automatic meteorological station situated 20 m from the experimental plots.…”

Section: In Situ Observationsmentioning

confidence: 99%

Quantified Benefits of Cultivating Day-Lily (Hemerocallis citrina) Hedgerows over Multiple Years on Sloped Red-Soil Farmland, Southern China

Zheng

Hong-ren

et al. 2020

J Soil Sci Plant Nutr

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Planting hedgerows is an effective measure for increasing soil and water conservation on sloped farmland, although the comprehensive and dynamic changes in benefits across the life span of the hedgerow are not fully understood. To expand our understanding in this area, day-lily (Hemerocallis citrina) was selected to research the effect of hedgerows built on sloped red-soil farmland in southern China. In situ observations of runoff and soil loss from 2012 to 2018 were recorded in triplicate for two treatments: (1) conventional downslope-ridge tillage (CT) and (2) hedgerow intercropping with downslope-ridge tillage (HT). Micro-topography, soil nutrient content, and crop yield changes in the study plots were recorded. Hedgerows began intercepting runoff and soil loss simultaneously from the second year after they were planted, reducing annual surface runoff (35-66%) and annual erosive sediment (32-87%). As hedgerows became established, they provided increasing positive effects on soil and water conservation. However, those beneficial effects were gradually obscured by changes in micro-topography. The presence of the hedgerow had no obvious influence on soil total nutrient contents under this experimental condition. On average, planting the hedgerow reduced peanut yield by 21% but reduced rapeseed yield only by 2%. Compared with CT treatment, the average economic output of HT treatment after reaching the hedge's initial production was 1.52 times greater, showing a quadratic trend and reaching a maximum about 4 years after construction by regression. These findings indicate that hedgerow management could be optimized according to the desired beneficial soil and water conservation or crop yield characteristics in different developmental phases.

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“…In the red soil region of southern China, high rainfall intensity and amounts occur frequently due to the well-developed monsoon. The annual precipitation is usually 800 to 2500 mm, which is 1.9 to 2.8 times higher than the national mean and 70% of the rainfall events occur from April to September as rainstorms [28], which can lead to severer soil and water loss, non-point source pollution, and further degradation in agriculture land. Under the rainfall conditions in this region, the potential of different groundcover plants for reducing soil erosion and non-point source pollution has not been adequately investigated [20,21].…”

Section: Introductionmentioning

confidence: 99%

Effect of Groundcovers on Reducing Soil Erosion and Non-Point Source Pollution in Citrus Orchards on Red Soil Under Frequent Heavy Rainfall

Zhang

et al. 2020

Sustainability

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Periods of consecutive days with heavy rain of high intensity are common in the red soil region of China, increasing unpredictable risks of soil erosion and non-point source pollution on sloping orchards. Grass cover, as a type of vegetation management, is useful for controlling soil erosion and pollution. However, the potential of different kinds of groundcover plants in combating soil erosion and non-point source pollution remains unclear under the rainfall conditions in this region of China. This study included 7 d of simulated rainfall applied to a set of six treatments: Bare soil control, natural grass, and four groundcover treatments, Trifolium repens, T. repens, and Lolium perenne, Vicia sativa and Festuca elata, Medicago polymorpha, and Cynodon dactylon. The effects of the treatments on runoff volume, and soil, nitrogen, and phosphorus losses were evaluated. The results indicated that greater soil erosion and non-point source pollution occurred over the first 3d of daily 1-h simulated rainfall events. Also, the beneficial effects of the groundcover plants were greater earlier in the 7-d period of daily heavy rain, particularly in reducing runoff and nitrogen loss on the second and third day. Compared with bare soil, all the groundcovers showed a reduction effect in varying degrees, among which T. repens treatment was more effective. T. repens treatment showed an overall reduction in runoff and soil loss by 25.5% and 91.5%, respectively, and total nitrogen, nitrate nitrogen, ammonia nitrogen and total phosphorus loss by 25.5%, 74.6%, 90.7%, and 81.8%, respectively. These findings indicated that single planting of perennial pasture T. repens with short stems is an effective management option to limit soil erosion and non-point source pollution in sloping citrus orchards of southern China.

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Exploring optimal measures to reduce soil erosion and nutrient losses in southern China

Cited by 62 publications

References 47 publications

Effects of Soil and Water Conservation Measures on Runoff and Sediment Yield in Red Soil Slope Farmland under Natural Rainfall

Effects of Soil and Water Conservation Measures on Runoff and Sediment Yield in Red Soil Slope Farmland under Natural Rainfall

Quantified Benefits of Cultivating Day-Lily (Hemerocallis citrina) Hedgerows over Multiple Years on Sloped Red-Soil Farmland, Southern China

Effect of Groundcovers on Reducing Soil Erosion and Non-Point Source Pollution in Citrus Orchards on Red Soil Under Frequent Heavy Rainfall

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