中国生态农业学报2018，Vol.26Issue(5)：737-745,9.DOI:10.13930/j.cnki.cjea.170766
氮肥配施生化抑制剂对黄泥田土壤钾素淋溶特征的影响
Effects of combined nitrogen fertilization with biochemical inhibitors on leaching characteristics of soil potassium in yellow clay soils
摘要
Abstract
Soil nutrient leaching in yellow clay soils, especially nitrogen (N) and potassium (K) leaching, is extremely serious in South China. This has resulted in not only waste of resources and potential environmental threat, but also in serious restriction on sustainable production of crops. In this study, the effects of urease inhibitor [N-(n-butyl) thiophosphoric triamide, NBPT], nitrifica-tion inhibitor [2-chloro-6-(trichloromethyl) pyridine, CP] and their combined application on leaching characteristics of K in yellow clay soils were investigated in an indoor soil column simulation with urea (U) and urea ammonium nitrate (UAN) application. The study aimed to improve the capability of soil K through rational application of biochemical inhibitors. In the leaching solution of different N fertilizers, higher average K+concentration was obtained under UAN treatments (average in 103.0 mg·kg-1) than under U treatments (average in 93.9 mg·kg-1), with obvious differences among inhibitor treatments. At the end of incubation (72 days after incubation), UAN treatments increased K+leaching average by 6.7% more than U treatments. K+accumulation in leaching solution under U treatments was in the order of U > U+NBPT > U+NBPT+CP > U+CP > CK. Compared with U treatment, U+NBPT, U+CP and U+NBPT+CP treatments reduced K+accumulation by 8.7%, 20.2% and 14.9%, respectively. K+accumulation under UAN treat-ments was in the order of UAN > UAN+NBPT > UAN+NBPT+CP > UAN+CP > CK. Compared with UAN treatment, K+accumula-tion in UAN+NBPT, UAN+CP and UAN+NBPT+CP treatments were reduced respectively by 6.0%, 13.8% and 9.2%. Additionally, leaching rate of K+across different treatments was in the order of UAN > UAN+NBPT > U > UAN+NBPT+CP > UAN+CP >U+NBPT > U+NBPT+CP > U+CP. In the middle of incubation (36 days after incubation), soil available K content of fertilizer mi-crosites under U and UAN treatments decreased significantly. The addition of CP effectively maintained high availability of K con-tent in the topsoil. Compared with the addition of NBPT alone, combined application of NBPT and CP reduced NO3- leaching, in-creased K+fixation on soil lattice and mitigated leaching risk of K+for more than 72 days in yellow clay soils. Equation models were used to describe the relationship between K+accumulation (y) and NO3- accumulation (x) in leaching solution. The linear equation (y=ax+b)and Elovich equation(y=alnx+b)fitted well,with a and b values for inhibitor treatments obviously different.In conclusion, the application of CP alone or in combination with NBPT in yellow clay soils effectively increased the adsorption of K+, minimized soil K+leaching loss, mitigated the risk of nutrient leaching and improved fertilizer utilization rate.关键词
钾淋溶/黄泥田土壤/脲酶抑制剂/硝化抑制剂/尿素/尿素硝铵Key words
Potassium leaching/Yellow clay soil/Urease inhibitor/Nitrification inhibitor/Urea/Urea ammonium nitrate分类
经济学引用本文复制引用
周旋,吴良欢,董春华..氮肥配施生化抑制剂对黄泥田土壤钾素淋溶特征的影响[J].中国生态农业学报,2018,26(5):737-745,9.基金项目
国家科技支撑计划项目(2015BAD23B03)、国家重点基础研究发展计划(973计划)项目(2015CB150502)、苕溪流域农村污染治理技术集成与规模化工程示范(2014ZX07101-012)、浙江省"三农六方"科研协作计划项目和浙江大学-浙江奥复托化工有限公司合作项目资助 The study was supported by the National Key Technology R&D Program of China(2015BAD23B03),the National Program on Key Basic Research Project of China(2015CB150502),the Rural Non-point Pollution Control Technology Integration and Scale Demonstration Project of Tiaoxi Catchment of Zhejiang Province,China(2014ZX07101-012),the"San Nong Liu Fang"Research Plan of Zhejiang Province and the Cooperation Project of Zhejiang University-Zhejiang Aofutuo Chemical Limited Company,China. （2015BAD23B03）
