镁碱化盐土微生物生物量和土壤基础呼吸  

Microbial Biomass and Basal Soil Respiration in Alkalized Magnesic Soils

作　　者：元炳成 刘权 黄伟[1] 李凤成[2] 

机构地区：[1]北京师范大学珠海分校,广东珠海519085 [2]甘肃广播电视大学,兰州730030

出　　处：《土壤》2011年第1期67-71,共5页Soils

基　　金：国家自然科学基金项目(30700104)资助

摘　　要：通过测定甘肃河西走廊疏勒河中游昌马冲积扇缘不同镁碱度条件下10个采样点30个土样的化学性质和生物化学性质指标,研究了电导率和镁碱度对土壤微生物生物量及其基础呼吸的影响。结果表明:微生物生物量碳(氮)和土壤基础呼吸与电导率、镁碱度和Mg2+/Ca2+之间显著负相关,表明盐度和镁碱度对土壤微生物群落有显著的抑制作用,而且盐度的抑制作用比镁碱度更大;微生物代谢熵(qCO2)和电导率、镁碱度、Mg2+/Ca2+之间为正相关关系,也说明镁碱化盐土对土壤微生物而言是一种严重的胁迫环境。The effects of EC（electrical conductivity of soil saturation paste） and Mg^2＋ alkalinity on soil microbial biomass and basal soil respiration in alkalized magnesic soils were investigated.The study was conducted along the border area of the alluvial fan of Chang Ma of Shu Le He River.Ten sites were chosen and thirty soil samples were taken.The results showed that microbial biomass C（N） and basal soil respiration negatively correlated with EC,exchangeable Mg^2＋ percentage and Mg^2＋/Ca^2＋,while the metabolic quotient（qCO2） positively correlated with EC,exchangeable Mg^2＋ percentage and Mg^2＋/Ca^2＋,which indicated the adverse effect that salinity and Mg^2＋ alkalinity stressec on soil microbial community.

关 键 词：电导率 镁碱度 Mg^2+/Ca^2+ 微生物生物量 土壤基础呼吸 微生物代谢熵 

分 类 号：S154.36[农业科学—土壤学]