节水灌溉Issue(4)：79-85,7.DOI:10.12396/jsgg.2025363
降雨对岩溶区水田旱地土壤溶液氮素运移的影响
Impact of Rainfall on Nitrogen Transport in Soil Solution of Paddy Fields and Drylands in Karst Regions
摘要
Abstract
This study investigates the vertical migration and transformation of nitrogen in response to rainfall events under dryland and paddy farming systems in a vulnerable karst agricultural area in the Huixian Wetland,Guilin.Through in-situ monitoring and Pearson correlation analysis,distinct patterns were identified between the two systems.In dryland conditions,rainfall leaching led to significant nitrate-nitrogen(NO3--N)accumulation in the 60 cm soil layer(peak:41.138 mg/L),with rapid leaching into groundwater.In contrast,paddy systems exhibited a marked decrease in the NO3--N/TN ratio and an increase in the NH4+-N/TN ratio in the top 30 cm soil.However,NO3--N dominated(up to 80.78％of TN)in deeper soil layers(>60 cm)and groundwater,driven by redox interface shifts associated with water table dynamics.The 60～100 cm soil horizon was identified as a critical buffer zone for nitrogen migration.Optimizing irrigation and fertilization timing to avoid rainfall peaks is recommended to mitigate groundwater contamination.关键词
土壤溶液/降雨/氮素迁移/岩溶区/旱地/水田Key words
soil solution/rainfall/nitrogen transport/karst area/dryland/paddy field分类
农业科技引用本文复制引用
谭映晴,代俊峰,龚春瑾,万祖鹏,黄凯..降雨对岩溶区水田旱地土壤溶液氮素运移的影响[J].节水灌溉,2026,(4):79-85,7.基金项目
国家自然科学基金项目(52269010) （52269010）
广西重点研发计划(桂科AB25069160). （桂科AB25069160）
