DOI: 10.1111/gcb.14937
论文题名: Dark microbial CO2 fixation in temperate forest soils increases with CO2 concentration
作者: Spohn M. ; Müller K. ; Höschen C. ; Mueller C.W. ; Marhan S.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2020
卷: 26, 期: 3 语种: 英语
英文关键词: anaplerotic reactions
; carbon cycle
; chemoautotrophic bacteria
; CO2 concentration
; dark microbial CO2 fixation
; fungal–bacterial interactions
; microbial carbon pump
; microbial soil carbon processing
; soil organic matter formation
Scopus关键词: carbon dioxide
; carbon fixation
; concentration (composition)
; experimental study
; forest soil
; formation mechanism
; fungus
; microbial activity
; soil carbon
; soil organic matter
; temperate forest
; Bacteria (microorganisms)
; Fungi
; Posibacteria
英文摘要: Dark, that is, nonphototrophic, microbial CO2 fixation occurs in a large range of soils. However, it is still not known whether dark microbial CO2 fixation substantially contributes to the C balance of soils and what factors control this process. Therefore, the objective of this study was to quantitate dark microbial CO2 fixation in temperate forest soils, to determine the relationship between the soil CO2 concentration and dark microbial CO2 fixation, and to estimate the relative contribution of different microbial groups to dark CO2 fixation. For this purpose, we conducted a 13C-CO2 labeling experiment. We found that the rates of dark microbial CO2 fixation were positively correlated with the CO2 concentration in all soils. Dark microbial CO2 fixation amounted to up to 320 µg C kg−1 soil day−1 in the Ah horizon. The fixation rates were 2.8–8.9 times higher in the Ah horizon than in the Bw1 horizon. Although the rates of dark microbial fixation were small compared to the respiration rate (1.2%–3.9% of the respiration rate), our findings suggest that organic matter formed by microorganisms from CO2 contributes to the soil organic matter pool, especially given that microbial detritus is more stable in soil than plant detritus. Phospholipid fatty acid analyses indicated that CO2 was mostly fixed by gram-positive bacteria, and not by fungi. In conclusion, our study shows that the dark microbial CO2 fixation rate in temperate forest soils increases in periods of high CO2 concentrations, that dark microbial CO2 fixation is mostly accomplished by gram-positive bacteria, and that dark microbial CO2 fixation contributes to the formation of soil organic matter. © 2019 The Authors. Global Change Biology published by John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159056
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Soil Biogeochemistry, Bayreuth Center of Ecology and Environmental Research (BayCEER), University of Bayreuth, Bayreuth, Germany; Soil Biology, Institute of Soil Science and Land Evaluation, University of Hohenheim, Stuttgart, Germany; Soil Science, Technical University of Munich, Freising-Weihenstephan, Germany
Recommended Citation:
Spohn M.,Müller K.,Höschen C.,et al. Dark microbial CO2 fixation in temperate forest soils increases with CO2 concentration[J]. Global Change Biology,2020-01-01,26(3)