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新农药多噻烷的土壤生态毒性研究
Study on the Soil Ecological Toxicity of Pesticide─Polythiacycloalkane
【摘要】 通过观察土壤呼吸作用强度、需氧细菌总数、真菌总数、硝化作用及固氮酶活性等指标的变化,研究了新农药多噻烷的土壤生态毒性。结果表明,在实验浓度为50~750mg/kg时,土壤呼吸作用强度及异养细菌数均见增加,且与施用浓度呈正相关,可分别达到对照组的1至3倍;真菌总数在750mg/kg时略见抑制,但不出半月又复原;多噻烷对土壤硝化作用呈现抑制效应,50、250、750mg/kg抑制率分别为23.9%、34.7%、51.1%;固氮酶活性在多噻烷浓度较低时(100mg/kg)增高,为对照组的131.81%,但浓度大于300mg/kg后,就表现为抑制作用。
【Abstract】 The effect of pesticide polythiacycloalkane on respiration,the quantities of aerobic bacteria and fungi,nitrification and N2 fixation in an agricultural soil were investigat-ed to study the soil ecological toxicity of pesticide polythiacycloalkane.When the concentra-tions of polythiacycloalkane were used from 50 to 750mg/kg CO2 production and the aerobic bacteria population were enhanced and the enhancement became higher with the increase of concentrations.Fungi population was reduced at higher concentration(750mg/kg),but the inhibition was temporary and restored after 14 days.Nitrification was inhibited obviously as concentration of polythiacycloalkane increased.Activity of nitrogenase was stimulated to 131.81% at lower concentration(100mg/kg)of polythiacycloalkane,but depressed when concentration of polythiacycloalkane is higher than 300mg/kg
- 【文献出处】 同济医科大学学报 ,Acta Universitatis Medictnae Tangji , 编辑部邮箱 ,1994年03期
- 【分类号】X592
- 【被引频次】3
- 【下载频次】67