期刊
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
卷 78, 期 21, 页码 7652-7661出版社
AMER SOC MICROBIOLOGY
DOI: 10.1128/AEM.01602-12
关键词
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资金
- National Natural Science Foundation of China [40701162]
- Zhejiang and Hangzhou Science and Technology Program, China [2009C33060, 20091633F06]
- U.S. Department of Energy
- Biological Systems Research on the Role of Microbial Communities in Carbon Cycling Program [DE-SC0004601]
- Oklahoma Bioenergy Center
Rising climate temperatures in the future are predicted to accelerate the microbial decomposition of soil organic matter. A field microcosm experiment was carried out to examine the impact of soil warming in freshwater wetlands on different organic carbon (C) pools and associated microbial functional responses. GeoChip 4.0, a functional gene microarray, was used to determine microbial gene diversity and functional potential for C degradation. Experimental warming significantly increased soil pore water dissolved organic C and phosphorus (P) concentrations, leading to a higher potential for C emission and P export. Such losses of total organic C stored in soil could be traced back to the decomposition of recalcitrant organic C. Warming preferentially stimulated genes for degrading recalcitrant C over labile C. This was especially true for genes encoding cellobiase and mnp for cellulose and lignin degradation, respectively. We confirmed this with warming-enhanced polyphenol oxidase and peroxidase activities for recalcitrant C acquisition and greater increases in recalcitrant C use efficiency than in labile C use efficiency (average percentage increases of 48% versus 28%, respectively). The relative abundance of lignin-degrading genes increased by 15% under warming; meanwhile, soil fungi, as the primary decomposers of lignin, were greater in abundance by 27%. This work suggests that future warming may enhance the potential for accelerated fungal decomposition of lignin-like compounds, leading to greater microbially mediated C losses than previously estimated in freshwater wetlands.
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