文献类型：期刊文献

中文题名：Changes in soil microbial biomass and community structure with addition of contrasting types of plant litter in a semiarid grassland ecosystem

作者：Hongmei Jin[1,2,3] Osbert Jianxin Sun[1] Jianfeng Liu[2,4]

第一作者：Hongmei Jin

机构：[1]MOE Key Laboratory for Silviculture and Conservation and Institute of Forestry and Climate Change Research,Beijing Forestry University,Beijing 100083,China;[2]State Key Laboratory of Vegetation and Environmental Change,Institute of Botany,Chinese Academy of Sciences,Beijing 100093,China;[3]Institute of Agricultural Resources and Environment,Jiangsu Academy of Agricultural Sciences,Nanjing 210014,China;[4]Institute of Forestry,Chinese Academy of Forestry,Beijing 100091,China

年份：2010

卷号：3

期号：3

起止页码：209-217

中文期刊名：植物生态学报（英文版）

外文期刊名：Journal of Plant Ecology

收录：Scopus

基金：National Natural Science Foundation of China(40741006,30521002,30821062).

语种：英文

中文关键词：belowground process;decomposition;plant litter;microbial community;priming effect;semiarid grassland

分类号：S71

摘要：Aims Elevated atmospheric CO_(2)has the potential to enhance the net primary productivity of terrestrial ecosystems.However,the role of soil microorganisms on soil C cycling following this increased available C remains ambiguous.This study was conducted to determine how quality and quantity of plant litter inputs would affect soil microorganisms and consequently C turnover.Methods Soil microbial biomass and community structure,bacterial community-level physiological profile,and CO_(2)emission caused by different substrate C decomposition were investigated using techniques of biological measurements,chemical and stable C isotope analysis,and BIOLOG-ECO microplates in a semiarid grassland ecosystem of northern China in 2006 and 2007 by mixing three contrasting types of plant materials,C_(3)shoot litter(SC_(3)),C_(3)root litter(RC_(3)),and C4 shoot litter(SC4),into the 10-to 20-cm soil layer at rates equivalent to 0(C0),60(C60),120(C120)and 240 g C m
2(C240).Important Findings Litter addition significantly enriched soil microbial biomass C and N and resulted in changes in microbial structure.Principal component analysis of microbial structure clearly differentiated among zero addition,C_(3)-plant-derived litter,and C4-plant-derived litter and among shoot-and root-derived litter of C_(3)plants;soilmicroorganismsmainly utilized carbohydrates without litter addition,carboxylic acids with C_(3)-plant-derived litter addition and amino acidswith C4-plant-derived litter addition.We also detected stimulated decomposition of older substratewith C4-plant-derived litter inputs.Our results showthat both quality and quantity of belowground litter are involved in affecting soil microbial community structure in semiarid grassland ecosystem.