西南林业大学学报2016，Vol.36Issue(2)：35-41,55,8.DOI:10.11929/j.issn.2095-1914.2016.02.006
氮对土壤中精甲霜灵残留量及其微生物的影响
Effect of Nitrogen on Metalaxyl-M Residues and Microorganism in the Soils
摘要
Abstract
In order to find out the effect of nitrogen on the metalaxyl-M residue in the krasnozem,the nitrogen fertilizer levels of N0,N1/2,N and N3/2 were separately set for 0.0 mg/kg,37.5 mg/kg,75.0 mg/kg and 112.5 mg/kg and 8.1 mg/kg of metalaxyl-M were added in the incubation experiment and the pot experiment,and the metalaxyl-M residue were extracted by methanol,then were detected by gas chromatography with FID to research the degradation of metalaxyl-M in krasnozem under four different nitrogen levels.The results showed that metalaxyl-M residues were degraded with a process of adsorption-desorption in soil,and the dissipation dynamics could be de-scribed by first-order rate equation.The degradation speed rate of metalaxyl-M under nitrogen fertilizer levels of 75.0 mg/kg was the fastest among four different nitrogen fertilizer levels.The amount of soil microorganisms also rapidly reduced after the metalaxyl-Mtreatment during the 2h-7d,and returned at the 7th day.The microbe quan-tity in different nitrogen levels was N>N3/2 >N1/2 >N0;besides,it was significant among N,N3/2 level and others, but not significant between N and N3/2 .Microbe quantity began to recover after 17 days.It suggested that both nitro-gen and metalaxyl-M residue were energy substance for microorganisms,promoting their growth and propagation.关键词
氮/精甲霜灵/降解/红壤/微生物/残留量Key words
nitrogen/metalaxyl-M/degradation/microorganism/residual amount分类
农业科技引用本文复制引用
杨艳梅,郑毅,范茂攀,丁凯..氮对土壤中精甲霜灵残留量及其微生物的影响[J].西南林业大学学报,2016,36(2):35-41,55,8.基金项目
国家自然科学基金项目（31260504，31460551，31210103906）资助；国家“973”计划项目（2011CB100405）资助；农业部公益性行业科研专项课题项目（201103003）资助。 （）
