DOI: 10.1007/s10533-014-0039-2
Scopus记录号: 2-s2.0-84921742553
论文题名: Elevated atmospheric carbon dioxide concentration stimulates soil microbial activity and impacts water-extractable organic carbon in an agricultural soil
作者: Fang H. ; Cheng S. ; Lin E. ; Yu G. ; Niu S. ; Wang Y. ; Xu M. ; Dang X. ; Li L. ; Wang L.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 122, 期: 2018-02-03 起始页码: 253
结束页码: 267
语种: 英语
英文关键词: Excitation-emission matrix spectra
; Extracellular enzymes activities
; Free air CO2 enrichment
; Rhizosphere priming effect
; Water extractable organic matter
Scopus关键词: agricultural ecosystem
; agricultural emission
; agricultural soil
; atmospheric deposition
; carbon dioxide
; carbon dioxide enrichment
; growth rate
; microbial activity
; rhizosphere
; soil carbon
; soil microorganism
; soil organic matter
; soybean
; topsoil
; wheat
; China
; Glycine max
; Triticum aestivum
英文摘要: Carbon dioxide (CO2) enrichment and increased nitrogen (N) deposition can change microbial activity and dissolved organic carbon (DOC) turnover, consequently affecting carbon sequestration in soils. However, we do not have much available information on the relationship between soil DOC and microbial activity under CO2 enrichment and N addition in semi-arid agroecosystems. Using free air CO2 enrichment (FACE), soybean and winter wheat were grown in the field under ambient CO2 (350 μmol mol−1) and elevated CO2 (550 μmol mol−1) conditions subjected to two N fertilizer regimes (132 and 306 kg N ha−1 year−1). Rhizosphere soils and bulk soils at three depths, 0–10, 10–20 and 20–40 cm, were collected to determine water extractable organic matter (WEOM) characteristics with fluorescence spectroscopy and parallel factor analyses of excitation/emission matrix, as well as five extracellular enzymes activities. All significant effects were observed in the topsoil (0–10 cm): elevated CO2 decreased water extractable organic carbon concentration of the rhizosphere soils and bulk soils by 8.5 and 10.1 %, respectively. Furthermore, elevated CO2 changed the composition and structure of soil WEOM by increasing the plant- and microbial-derived components in the rhizosphere and solubilizing soil organic matter (SOM). The activities of β-1,4-glucosidase, cellobiohydrolase, phenol oxidase, and peroxidase were stimulated by elevated CO2 in the rhizosphere soils and bulk soils. Our findings suggest that the stimulation of microbial activity elicited by elevated CO2 increased the turnover of labile WEOM and the solubilization of SOM in the topsoils, which could be adverse to the accumulation and stability of soil carbon in the semi-arid agroecosystems in northern China. © 2014, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83556
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China; 11A Datun Road, Chaoyang District, Beijing, China; University of Chinese Academy of Sciences, Beijing, China; Key Laboratory for Agro-Environment and Climate Change, Ministry of Agriculture, Beijing, China
Recommended Citation:
Fang H.,Cheng S.,Lin E.,et al. Elevated atmospheric carbon dioxide concentration stimulates soil microbial activity and impacts water-extractable organic carbon in an agricultural soil[J]. Biogeochemistry,2015-01-01,122(2018-02-03)