微生物代谢产物I_(36)N对土壤脲酶活性抑制作用研究  

EFFECT OF METABOLIC PRODUCT I36N FROM A MICROORGANISM ON SOIL UREASE ACTIVITY

作　　者：陈济琛[1] 林新坚[1] 韩闽毅[1] 郑时利[1] 刘中柱[1] 

机构地区：[1]福建省农业科学院土壤肥料研究所,福州350013

出　　处：《植物营养与肥料学报》1996年第1期74-78,共5页Journal of Plant Nutrition and Fertilizers

摘　　要：利用一株赭曲霉代谢产物I_(36)N作为脲酶抑制剂研究对土壤脲酶活性的抑制作用,结果表明,I_(36)N对我省主要5种水稻田土壤脲酶活性具有明显的抑制作用。土壤脲酶活性高,I_(36)N抑制作用强,但抑制时间较短。抑制活性随I_(36)N浓度而增强。与化学抑制剂NBPT相比,虽然I_(36)N对土壤脲酶活性的抑制所需用量较大,但抑制时间延长。盆栽试验结果表明,施加I_(36)N后,水层尿素水解速率降低,(NH^+_4+NH_3)—N高峰期比对照推迟2～4天,高峰值也较低。水层pH值变化规律与(NH^+_4+NH_3)—N变化一致。The investigation results showed that the metabolic product I36N from Aspergilius sp. has an obvious inhibition to urease activity of five main kinds of soil in our province. The rate of I36N inhibition on soil urease varied with the activity of soil urease and its effect on higher activity of soil urease is better than its on lower, but was prolonged in the period of retarding urease activity. The inhibiting degree was increased with the increase of I36N application amount and urea concentration used. The pot experiment indicated that I36N could postponed effectively the hydrolysis of urea, delayed high peak of (NH44+NH3)-N from 2 to 4 days and the level of NH3 concentration was lower than control, the change of the pH value was consilience with behaviour of (NH4++NH3)-N in the pot water.

关 键 词：脲酶 脲酶抑制剂 I36N 赭曲霉 土壤肥力 

分 类 号：S158[农业科学—土壤学]