洞庭湖典型湿地植被群落土壤微生物特征  

Soil microbial characteristics of Dongting Lake wetlands with different typical vegetation communities

作　　者：刘银银[1,2] 孙庆业[1] 李峰[2] 谢永宏[1,2] 

机构地区：[1]安徽大学资源与环境工程学院,合肥230601 [2]中国科学院亚热带农业生态研究所,亚热带农业生态过程重点实验室,洞庭湖湿地生态观测研究站,长沙410125

出　　处：《生态学杂志》2013年第5期1233-1237,共5页Chinese Journal of Ecology

基　　金：国家重点基础研究发展计划项目(2012CB417005);国家自然科学基金项目(31200271和31070325)资助

摘　　要：以洞庭湖湿地3种典型植被(虉草、苔草、芦苇)为对象,研究了不同植被下土壤微生物生物量和微生物呼吸等特征,并对其主要影响因子进行了分析。结果表明:微生物生物量碳、氮和微生物呼吸以虉草群落最高,苔草群落次之,芦苇群落最低,微生物碳熵变化趋势为虉草群落>苔草群落>芦苇群落,微生物呼吸熵具有与微生物碳熵相反的变化趋势。相关分析表明:土壤含水量、容重和有机质是影响土壤微生物特征变化的重要因子,同时,土壤pH和土壤总氮与土壤微生物生物量碳、微生物生物量氮、微生物呼吸等也有较强的关联性。Taking the Dongting Lake wetlands with three typical vegetations （Phalaris arundina- cea , Carex brevicuspis, and Phragmites australis） as the objects, this paper studied their soil mi- crobial characteristics, including microbial biomass carbon and ni＇trogen and microbial respira- tion, and analyzed the related main affecting factors. In the test wetlands, the soil microbial bio- mass carbon （MBC） and nitrogen （MBN）, soil microbial respiration, and the ratio of soil MBC to soil organic carbon （qMBC） were in the order of P. arundinacea 〉 C. brevicuspis 〉 P. aust- ralis, whereas the soil microbial metabolic quotient （qCO2 ） had an opposite tendency to qMBC. The correlation analysis of the soil microbial characteristics and environmental factors showed that soil moisture content, bulk density, and organic matter content were the main environmental fac- tors affecting the soil microbial characteristics, and soil pH and total nitrogen content also bad strong relationships with the soil microbial characteristics.

关 键 词：微生物生物量碳 微生物生物量氮 微生物呼吸 洞庭湖 

分 类 号：S154.3[农业科学—土壤学]