摘要
硝化抑制剂对农业土壤氮素迁移转化有重要意义。本研究以喀斯特地区典型黄壤土为对象,采用土柱模拟5种施肥类别条件(常量施氮肥,常量氮肥+硝化抑制剂DMPP,120%氮肥+硝化抑制剂DMPP,80%氮肥+硝化抑制剂DMPP,常量氮肥+硝化抑制剂DMPP+磷肥),研究硝化抑制剂3,4⁃二甲基吡唑磷酸盐(DMPP)对喀斯特土壤氮素转化及淋溶流失潜能的影响。结果表明:配施DMPP的喀斯特黄壤土中硝化反应受到有效抑制,与常量施肥条件相比,硝态氮浓度平均降低了34.8%±4.2%;氮肥减量措施(常规施肥量的80%)与DMPP配施相较于常规施肥可以使土壤中硝态氮的淋溶损失降低56.4%±6.1%;与单施尿素和DMPP相比,添加磷肥后,土壤淋溶液中硝态氮浓度提高了56.2%±5.4%,磷添加对DMPP的作用效果有抑制作用。综上,在喀斯特地区施用DMPP可以抑制农田土壤硝化过程,并有效减少硝态氮的淋溶,降低地下水氮素的污染风险,这对该地区的水资源管理和生态环境保护具有重要的意义。
Nitrification inhibitors play a critical role in the migration and transformation of nitrogen in agricultural soils.Using soil column simulations,we investigated the effects of different fertilization treatments on nitrogen trans⁃formation and leaching potential in typical yellow soil in a karst region.There were five treatments,including con⁃ventional nitrogen fertilizer,conventional nitrogen fertilizer with nitrification inhibitor DMPP,120%nitrogen ferti⁃lizer with nitrification inhibitor DMPP,80%nitrogen fertilizer with nitrification inhibitor DMPP,and conventional nitrogen fertilizer with nitrification inhibitor DMPP and phosphate fertilizer.The results showed that soil nitrification was inhibited by DMPP.Compared to the conventional fertilization condition,nitrate concentration was reduced by 34.8%±4.2%.The nitrogen reduction strategy(80%of the conventional fertilization amount)combined with DMPP application resulted in a 56.4%±6.1%decrease in nitrate leaching compared to conventional fertilization.The addi⁃tion of phosphate fertilizer increased nitrate concentration in the soil leachate by 56.2%±5.4%compared to the application of urea and DMPP alone,indicating that phosphorus addition has an inhibitory effect on the function of DMPP.In summary,DMPP application in karst regions can inhibit soil nitrification,effectively reduce nitrate leaching and the risk of groundwater nitrogen pollution,which is of great significance for water resource manage⁃ment and ecological environment protection in karst agricultural soils.
作者
时治宇
王晓丹
陆萌
毛菊
高云龙
马僖
岳甫均
SHI Zhiyu;WANG Xiao-dan;LU Meng;MAO Ju;GAO Yunlong;MA Xi;YUE Fujun(School of Ecological and Environmental Engineering,Guizhou University for Nationalities,Guiyang 550025,China;School of Earth System Science,Tian-jin University,Tianjin 300072,China)
出处
《生态学杂志》
北大核心
2025年第8期2531-2540,共10页
Chinese Journal of Ecology
基金
第二次青藏高原综合科学考察研究项目(2019QZKK0601⁃3)
国家自然科学基金项目(41803022,42073076,42167067)
贵州省教育厅自然科学研究项目(黔教技[2023]034号)资助。
关键词
岩溶
DMPP
减施氮肥
氮流失
karst
DMPP
reduced nitrogen fertilizer application
nitrogen loss
