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[1]LI Ganghao,XIA Ying,HUANG Min,et al.Characteristics of Nitrogen and Phosphorus Losses on Sloping Farmland Under No-tillage and Straw Mulch in the Three Gorges Reservoir Area[J].Research of Soil and Water Conservation,2023,30(02):93-99,106.[doi:10.13869/j.cnki.rswc.2023.02.017]

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Characteristics of Nitrogen and Phosphorus Losses on Sloping Farmland Under No-tillage and Straw Mulch in the Three Gorges Reservoir Area

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 02 Page number: 93-99,106 Column: Public date: 2023-03-10

Title:: Characteristics of Nitrogen and Phosphorus Losses on Sloping Farmland Under No-tillage and Straw Mulch in the Three Gorges Reservoir Area

Author(s):: LI Ganghao^1,2, XIA Ying², HUANG Min¹, FAN Xianpeng², WU Maoqian², CHENG Zizhen², XIA Shujie²; (1.School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China; 2.Institute of Plant Protection and Soil Fertilizer, Hubei Academy of Agricultural Sciences/Hubei Engineering Technology Research Center of Agricultural Non-Point Source Pollution Control/ Key Laboratory of Fertilization from Agricultural Wastes, Ministry of Agriculture and Rural Affairs, Wuhan 430064, China)

Keywords:: straw mulch; non-point source pollution; surface runoff; soil erosion; Three Gorges Reservoir area

CLC:: S157.4; S153.6⁺1

DOI:: 10.13869/j.cnki.rswc.2023.02.017

Abstract:: In order to effectively control the losses of nitrogen and phosphorus from sloping farmland in the Three Gorges reservoir area, the field runoff monitoring experiment was carried out in Changping Watershed for two consecutive years. A field experiment was conducted to study the effects of no-tillage straw mulching(SM)and control(CK)on surface runoff and nitrogen and phosphorus losses under natural rainfall conditions. The results show that:(1)there is a very significant positive correlation between rainfall and runoff; runoff is mainly caused by several heavy rain events; it is necessary to focus on preventing soil erosion caused by heavy rain in the corn season; no-tillage straw mulching can reduce surface runoff and sediment production; compared with the control treatment, no-tillage straw mulching reduces runoff loss by 19.1% and sediment loss by 63.6%;(2)no-tillage straw mulching reduced total nitrogen and total phosphorus losses by 21.3% and 25.8%, respectively; there is a very significant positive correlation between runoff and nitrogen and phosphorus losses; no-tillage straw mulching mainly reduces nitrogen and phosphorus losses by reducing runoff;(3)the risk period of nitrogen and phosphorus loss is from June to early July, during which 41.3% of runoff of CK contributes 81.4% and 52.1% of total nitrogen and total phosphorus losses, 38.4% of runoff of SM contributes 75.2% and 48.2% of total nitrogen and total phosphorus losses; in this period, total nitrogen and total phosphorus losses can be reduced by 17.5% and 31.7%, respectively, through no-tillage straw mulching. No-tillage straw mulching is a good soil and water conservation measure to control the losses of nitrogen and phosphorus nutrients from sloping farmland in the Three Gorges Reservoir area.

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Last Update: 2023-03-10