水土保持研究2026，Vol.33Issue(1)：111-119,9.DOI:10.13869/j.cnki.rswc.2026.01.018
减氮增菌处理对川南紫色土坡耕地氮磷流失的影响
Effects of nitrogen reduction and bacterial enhancement on nitrogen and phosphorus losses in purple soil slope farmland in southern Sichuan
摘要
Abstract
[Objective]This study aims to clarify the problem of nitrogen(N)and phosphorus(P)losses via surface runoff on sloping farmland,investigate the effects of nitrogen reduction and bacterial enhancement,and reveal the relationship between application rate of bacterial biofertilizer,sediment yield,and N/P losses in runoff,providing new perspectives and approaches for addressing the challenges of controlling such losses.[Methods]Field runoff plot observation experiments were conducted,with no fertilizer application as the control(CK),and treatments of conventional fertilization(T1),N reduction by 30%(T2),N reduction by 30%with medium rate of bacterial biofertilizer(T3),and N reduction by 30%with high rate of bacterial biofertilizer(T4)were set up.The variation characteristics in runoff volume,sediment yield,and concentrations and loss amounts of total N(TN),dissolved N(DN),total P(TP),and dissolved P(DP)under different treatments were compared.[Results](1)Compared with CK,the T4 treatment demonstrated the best soil and water conservation effectiveness,significantly reducing sediment yield(by 84.11%),TN loss(by 60.49%),DN loss(by 70.11%),and DP loss(by 55.78%).Furthermore,compared with T2,the T4 treatment significantly reduced TN concentration(by 46.75%),TN loss(by 49.80%),DN concentration(by 54.25%),and DN loss(by 56.46%).(2)Regression analysis revealed that the losses of TN,DN,TP,and DP were significantly positively correlated with runoff volume.(3)The TN/TP ratios in runoff under most treatments remained below 22,indicating that most soil in the study area was nitrogen-limited.[Conclusion]N reduction and bacterial enhancement treatments effectively reduce runoff volume,sediment yield,and N and P losses in runoff from slope farmland.These fertilization practices can be recommended as an effective agronomic measure to promote sustainable agricultural production on slope farmland in southwestern China and to reduce non-point source pollution from paddy fields.关键词
紫色土/减氮/增菌/氮磷流失/菌肥用量Key words
purple soil/nitrogen reduction/bacterial enhancement/nitrogen and phosphorus losses/application rate of bacterial biofertilizer分类
农业科技引用本文复制引用
Li Renyu,Zeng Xiewei,Ding Weifeng,Hu Bangyou,Hu Huaizhou,Li Tianyang,He Binghui..减氮增菌处理对川南紫色土坡耕地氮磷流失的影响[J].水土保持研究,2026,33(1):111-119,9.基金项目
国家自然科学基金项目(U20A20326) （U20A20326）
宜宾市双城协议保障科研经费项目(XNDX2022020002). （XNDX2022020002）
