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

文献类型: 外文期刊

第一作者: Jin, Hongmei

作者: Jin, Hongmei;Sun, Osbert Jianxin;Jin, Hongmei;Sun, Osbert Jianxin;Jin, Hongmei;Liu, Jianfeng;Jin, Hongmei;Liu, Jianfeng

作者机构:

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

期刊名称:JOURNAL OF PLANT ECOLOGY ( 影响因子:1.774; 五年影响因子:2.547 )

ISSN: 1752-9921

年卷期: 2010 年 3 卷 3 期

页码:

收录情况: SCI

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.

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