Effects of hydrological processes on nitrogen loss in purple soil

Jia, Haiyan; Lei, Alin; Lei, Junshan; Yao, Min; Zhao, Jingzhu

doi:10.1016/j.agwat.2006.12.013

Cited by 51 publications

(35 citation statements)

References 13 publications

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“…Under the condition of slope gradient kept the same, subsurface runoff increased at first, then decreased with rainfall intensity increased (Figure 5b). This may be due to the facts that a long low intensity rainfall can cause more subsurface flow than a short high intensity rainfall (Jia et al, 2007;Naef et al, 2002). On a slope less than 10°, subsurface runoff reached the maximum when rainfall intensity was 2.1 mm·min -1 .…”

Section: Rainfall Intensity and Slope Gradient Effects On Runoffmentioning

confidence: 99%

“…The experimental system includes rainfall simulator (a side-sprinkle rainfall simulating set-up), an experimental soil flume (the flume was 3 m in length, 1 m in width and 0.5 m in depth) . Slope gradient of the flume can be adjusted in the range of 0-25°.The soil profile at the downslope end of the flume was covered with an aminoplastic web and the gap between the amino-plastic web and the bottom of the flume was filled with gravel (Jia et al, 2007). A trench about 0.05 m deep and 1m width were constructed at the bottom of the flume.…”

Section: Rainfall Simulation Experimental Systemmentioning

confidence: 99%

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Hydraulic characteristics and sediment generation on slope erosion in the Three Gorges Reservoir Area, China

Feng

Cheng

Ding

et al. 2016

Journal of Hydrology and Hydromechanics

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Hydrological processes play important roles in soil erosion processes of the hillslopes. This study was conducted to investigate the hydrological processes and the associated erosional responses on the purple soil slope. Based on a comprehensive survey of the Wangjiaqiao watershed in the Three Gorges Reservoir, four typical slope gradients (5°, 10°, 15°and 20°) were applied to five rainfall intensities (0.6, 1.1, 1.61, 2.12 and 2.54 mm·min -1 ). The results showed that both surface and subsurface runoff varied greatly depending on the rainfall intensity and slope gradient. Surface runoff volume was 48.1 to 280.1 times of that for subsurface runoff. The critical slope gradient was about 10°. The sediment yield rate increased with increases in both rainfall intensity and slope gradient, while the effect of rainfall intensity on the sediment yield rate was greater than slope gradient. There was a good linear relationship between sediment yield rate and Reynolds numbers, flow velocity and stream power, while Froude numbers, Darcy-Weisbach and Manning friction coefficients were not good hydraulic indicators of the sediment yield rate of purple soil erosion. Among the three good indicators (Re, v and w), stream power was the best predictor of sediment yield rate (R 2 = 0.884). Finally, based on the power regression relationship between sediment yield rate, runoff rate, slope gradient and rainfall intensity, an erosion model was proposed to predict the purple soil erosion (R 2 = 0.897). The results can help us to understand the relationship between flow hydraulics and sediment generation of slope erosion and offer useful data for the building of erosion model in purple soil.

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Section: Rainfall Intensity and Slope Gradient Effects On Runoffmentioning

confidence: 99%

Section: Rainfall Simulation Experimental Systemmentioning

confidence: 99%

Hydraulic characteristics and sediment generation on slope erosion in the Three Gorges Reservoir Area, China

Feng

Cheng

Ding

et al. 2016

Journal of Hydrology and Hydromechanics

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“…JW, YS, TZ), the sites located in the inlet (a little far from the mainstream) had higher TN sed and lower TP sed . Usually, nitrogen comes from diffused pollution (Jia et al, 2007). Therefore, the dense population around these regions contributed to the high nitrogen content.…”

Section: Discussionmentioning

confidence: 99%

Sedimentary nutrients in the mainstream and its five tributary bays of a large subtropical reservoir (Three Gorges Reservoir, China)

Zhang¹,

Xu²,

Shao³

et al. 2012

Quaternary International

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“…A great deal of attention has been paid to N transport through overland flow from sloped purple soil farmlands in the Sichuan Basin, Southwest China (Huang et al 1998;Xu et al 2006). Jia et al (2007) studied the influence of rainfall features on nitrate loss through an artificial rainfall simulation experiment. Zhu et al (2009) reported four-year measurements of nitrate leaching from a sloping farmland in this area by in situ monitoring.…”

Section: Introductionmentioning

confidence: 99%

Nitrate loss via overland flow and interflow from a sloped farmland in the hilly area of purple soil, China

Wang

Zhu

2011

Nutr Cycl Agroecosyst

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Nitrate losses through runoff (both overland flow and interflow) represent a significant portion of the nitrogen (N) biogeochemical cycle. The mechanisms of this cycle have been well documented for flat agricultural lands. It is unclear, however, how nitrate loss takes place in sloping farmlands of purple soil. This paper reports the finding of a field experiment examining nitrate losses due to overland flow and interflow along sloping farmland sites dominated by a regosol known as purple soil in the Sichuan Basin, Southwest China. During rainfall events, the nitrate contents in the overland flow initially increased and then decreased gradually, however, the nitrate contents in the interflow increased and then approached to a steady status. The average nitrate concentrations in the overland flow and the interflow were 0.7 ± 0.2 and 21.7 ± 2.1 mg N L -1 , respectively. The annual nitrate loss loads through the overland flow and the interflow were 0.9 ± 0.1 and 33.5 ± 2.7 kg N ha -1 , respectively accounting for 0.6 and 22% of the fertilizer applied in the growing season. Nitrate was predominantly lost via interflow in the sloping farmland in Sichuan Basin, Southwest China. The experimental farmland was located in the upper stream of the Yangtze River, and the conclusions yielded from this study can be applied to interpreting the eutrophication and groundwater pollution patterns that are currently occurring in this watershed.

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Effects of hydrological processes on nitrogen loss in purple soil

Cited by 51 publications

References 13 publications

Hydraulic characteristics and sediment generation on slope erosion in the Three Gorges Reservoir Area, China

Hydraulic characteristics and sediment generation on slope erosion in the Three Gorges Reservoir Area, China

Sedimentary nutrients in the mainstream and its five tributary bays of a large subtropical reservoir (Three Gorges Reservoir, China)

Nitrate loss via overland flow and interflow from a sloped farmland in the hilly area of purple soil, China

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