两种土壤微生物生物量对外源镧的反应  

Responses of Microbial Biomass Towards Exogenous Lanthanum in Two Soils

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

机构地区：[1]中国科学院南京土壤研究所土壤圈物质循环开放研究实验室,江苏南京210008 [2]南京农业大学应用微生物学系,江苏南京210095

出　　处：《农业环境科学学报》2003年第1期6-8,共3页Journal of Agro-Environment Science

基　　金：国家自然科学基金资助项目(29890282)

摘　　要：在实验室条件下研究了黄潮土、水稻土微生物生物量对外源镧的反应。外源镧对两种土壤微生物生物量均表现为抑制的影响并随着浓度增加抑制作用增强。镧对黄潮土微生物生物量的抑制作用要高于水稻土,这可能与黄潮土有机质含量和阳离子交换量较低有关。土壤微生物生物量氮对外源镧的反应较生物量碳更为敏感。外源镧使土壤微生物群落向C/N比高的微生物方向发展。Responses of microbial biomass to e xogenous lanthanum(La)in two soils were studied under laboratory condition.It has been found that exogenous La had inhi bitory effects on microbial biomass in two soils and the inhibition stren gthened with the in-creased concentrations of La.The in hibition of La in fluvo -aquic soil wa s higher than that in paddy soil,whic h may be explained by lower organic matter and CEC content in fluvo -aquic soil.Soil microbial biomass C was more sensitive to exogenous La than mi-crobial biomass N.Soil microbial community would change to these microorganisms with higher C /N ratio after application of La.

关 键 词：外源镧 黄潮土 水稻土 微生物生物量 碳/氮比 稀土 

分 类 号：S154.36[农业科学—土壤学] X172[农业科学—农业基础科学]