[1]Zhang Wei,Zeng Fengling,Zou Yuxia,et al.Effects of Straw and Biochar on Runoff, Sediment Yield and Nitrogen Loss in Sloping Farmland of Purple Soil[J].Research of Soil and Water Conservation,2024,31(04):20-27.[doi:10.13869/j.cnki.rswc.2024.04.033]
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
31
Number of periods:
2024 04
Page number:
20-27
Column:
Public date:
2024-06-30
- Title:
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Effects of Straw and Biochar on Runoff, Sediment Yield and Nitrogen Loss in Sloping Farmland of Purple Soil
- Author(s):
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Zhang Wei1, Zeng Fengling2, Zou Yuxia1, Zhao Yifan1, Zhang Weihua1
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(1.College of Resources and Environment, Southwest University, Chongqing 400716, China; 2.Shuanghe Sub-district Office of Rongchang District, People's Government of Chongqing Municipality, Chongqing 402460, China)
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- Keywords:
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biochar; purple soil; runoff and sediment yield; nitrogen loss
- CLC:
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S157.1; S158.3
- DOI:
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10.13869/j.cnki.rswc.2024.04.033
- Abstract:
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[Objective]The aims of this study are to investigate the specific improvement effects of different additions of straw and biochar on the sloping arable land of purple soil, so as to provide theoretical references for the reasonable prevention and control of soil erosion in the Three Gorges Reservoir area. [Methods]The effects of rice straw(4, 7, 10 t/hm2)and biochar(13, 39, 65 t/hm2)on sediment yield and nitrogen loss in purple soil slope were studied by artificial rainfall simulation method, with bare slope as the control. [Results](1)Under the condition of high intensity rainfall, the mixture of biochar with purple soil accelerated the process of runoff production on slope, and the application of mixed straw could prolong the initial time of runoff production and reduce the rate of runoff production.(2)The cumulative sediment yield of purple soil increased by 0.64%~66.29% compared with the control group after adding biochar, but decreased by 42.58%~70.27% after adding mixed straw. The inhibitory effect of mixed straw on sediment yield on slope was much stronger than that on runoff yield on slope.(3)The nitrogen loss process in surface runoff was dominated by NO-3-N, and the overall loss moduli of TN, NO-3-N and NH+4-N were the largest under biochar treatment, and the smallest under mixed straw treatment. [Conclusion]The application of crushed straw can promote seepage and inhibit flow, effectively control soil, water and nutrient loss in purple slope farmland, while the short-term application of biochar may have negative effects.