外源镧对土壤微生物碳源利用的影响  

Effects of exogenous lanthanum on carbon utilization of soil microorganisms.

作　　者：褚海燕[1] 卜元卿[2] 林先贵[1] 朱建国[1] 谢祖彬[1] 曹志洪[1] 张华勇[1] 

机构地区：[1]中国科学院南京土壤研究所,江苏南京210008 [2]南京农业大学微生物学系,江苏南京210095

出　　处：《农村生态环境》2003年第1期47-49,共3页Rural Eco-Environment

基　　金：国家自然科学基金重大项目 ( 2 9890 2 82 );中国科学院封丘实验站资助项目

摘　　要：用14 C标记葡萄糖法研究了外源镧对土壤微生物碳源利用的影响。结果表明 :外源镧在低浓度下可增强土壤微生物利用碳源进行呼吸作用 ,而高浓度下则产生显著抑制作用 ,最大抑制率为 3 3 %。土壤微生物呼吸产生的14 CO2 主要是培养初期释放的 ,培养 14d后14 CO2 释放已非常少。外源镧可增强土壤微生物利用碳源合成自身的生物量 ,最大增幅为 2 5 %。Effects of exogenous lanthanum (La) on carbon utilization of soil microorganisms were studied by means of 14C-labeled glucose.Results show that low concentration of exogenous lanthanum increased carbon utilization of soil microorganisms in respiration.But when the concentration of exogenous lanthanum was high,the carbon utilization was inhibited by 33% to the maximum. Most of the 14CO 2 generated was the product of respiration of soil microorganisms during the initial period of the incubation and the production of 14CO 2 was very limited after D14.The supply of exogenous La improved carbon utilization of soil microorganisms in respiration, thus increasing the microbial biomass of the microorganisms per se by 25% to the maximum.

关 键 词：镧 ^14C葡萄糖 碳源利用 微生物生物量 呼吸作用 

分 类 号：S154.36[农业科学—土壤学]