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洞庭湖典型湿地植被群落土壤微生物特征

刘银银1,2,孙庆业1,李峰2,谢永宏1,2**   

  1. (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)
  • 出版日期:2013-05-10 发布日期:2013-05-10

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

LIU Yin-yin1,2, SUN Qing-ye1, LI Feng2, XIE Yong-hong1,2**   

  1. (1School of Resources and Environmental Engineering, Anhui University, Hefei 230601, China; 2 Institute of Subtropical Agriculture, Key Laboratory for Agroecological Processes in Subtropical Region, Dongting Lake Station for Wetland Ecosystem Observation and Research, Chinese Academy of Sciences, Changsha 410125, China)
  • Online:2013-05-10 Published:2013-05-10

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。

关键词: 艾比湖区域, 景观格局, 生态风险, 时空分异

Abstract: Taking the  Dongting Lake  wetlands with three typical vegetations (Phalaris arundinacea,    Carex brevicuspis,   and  Phragmites australis)  as the objects, this paper studied their soil microbial characteristics, including microbial  biomass carbon and nitrogen and  microbial  respiration,  and analyzed the related main affecting factors.  In the  test  wetlands,  the  soil  microbial biomass 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 .  australis,  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 factors  affecting the  soil microbial  characteristics, and soil  pH and total nitrogen content  also had  strong  relationships   with the  soil microbial characteristics.

Key words: Ebinur Lake region, landscape pattern, ecological risk, spatio-temporal variation.