环境因素主导着冰川前沿裸露地好氧异养细菌群落的分布  

Distribution of Aerobic Heterotrophic Bacteria Managed by Environmental Factors in Glacier Foreland

作　　者：章高森[1] 张威[1] 刘光琇[1] 安黎哲[2] 陈拓[3] 李忠勤[3] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所沙漠与沙漠化重点实验室,甘肃兰州730000 [2]兰州大学生命科学学院,甘肃兰州730000 [3]中国科学院寒区旱区环境与工程研究所冰冻圈科学国家重点实验室,甘肃兰州730000

出　　处：《冰川冻土》2012年第4期965-971,共7页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金项目(40971034;31170465;31100365);国家重点基础研究发展计划(973计划)项目(2012CB026105);国家国际科技合作专项项目(2011DFA32520)资助

摘　　要：冰川前沿裸露地有着暴露年代序列特性,是研究微生物群落结构时空变化的理想地区.通过对1号冰川东支前沿裸露地的微生物学研究发现,从冰土交界处到1675年的冰碛垄,25℃下培养得到细菌数量从5.5×104 CFUs.g-1增加到3.3×106 CFUs.g-1,而微生物总数的变化在暴露年代序列上都没有显著的相关关系;细菌群落结构的主要改变发生在两个阶段,暴露初期和植被盖度明显增加的时候.联系到这两个阶段正好是环境温度与土壤营养水平改变的时期,此结果表明,环境变化是冰川前沿裸露地微生物群落时空变化的主要驱动力.Glacier foreland,possessing a chronosequence of exposure,is an ideal area to study microbial community dynamics across space and time.Traditional microbial study in the foreland of the east branch of the Glacier No.1 showed the number of culturable bacteria at 25 ℃ increasing from 5.5×104 CFUs·g-1 at the edge of glacier terminus to 3.3×106 CFUs·g-1 at the moraine of 1675.In contrast,there is no significant correlation between the number of culturable bacteria or total microorganisms and the chronosequence.There were two stages of major change in bacterial population： 1） at the beginning of exposure and 2） at the stage of distinctly increasing vegetation coverage.Consequently,these two stages reflected the change in environmental temperature and the enhancement in soil nutrient level.The results indicate that the change in environment drives the change in microbial community spatially and temporally.

关 键 词：冰川前沿裸露地 微生物 微生物群落演替 环境因素 

分 类 号：Q938[生物学—微生物学]