文献类型：期刊文献

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

作者：Jin, Hongmei[1,2,3,4] Sun, Osbert Jianxin[1,2] Liu, Jianfeng[3,5]

第一作者：Jin, Hongmei

通信作者：Sun, OJ[1]

机构：[1]Beijing Forestry Univ, Coll Forest Sci, MOE Key Lab Silviculture & Conservat, Beijing 100083, Peoples R China;[2]Beijing Forestry Univ, Inst Forestry & Climate Change Res, Beijing 100083, Peoples R China;[3]Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China;[4]Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Nanjing 210014, Peoples R China;[5]Chinese Acad Forestry, Inst Forestry, Beijing 100091, Peoples R China

年份：2010

卷号：3

期号：3

起止页码：209-217

外文期刊名：JOURNAL OF PLANT ECOLOGY

收录：;Scopus(收录号：2-s2.0-77956035993);WOS:【SCI-EXPANDED(收录号:WOS:000282101800008)】；

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

语种：英文

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

摘要：Aims Elevated atmospheric CO2 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 CO2 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 (SC3), C-3 root litter (RC3), and C-4 shoot litter (SC4), into the 10- to 20-cm soil layer at rates equivalent to 0 (C-0), 60 (C-60), 120 (C-120) and 240 g C m(-2) (C-240). 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 C-4-plant-derived litter and among shoot- and root-derived litter of C-3 plants; soil microorganisms mainly utilized carbohydrates without litter addition, carboxylic acids with C-3-plant-derived litter addition and amino acids with C-4-plant-derived litter addition. We also detected stimulated decomposition of older substrate with C-4-plant-derived litter inputs. Our results show that both quality and quantity of belowground litter are involved in affecting soil microbial community structure in semiarid grassland ecosystem.