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The rhizosphere and hyphosphere differ in their impacts on carbon and nitrogen cycling in forests exposed to elevated CO2
Meier I. C.; Pritchard, S. G.; Brzostek, E. R.; Mccormack, M. L.; Phillips, R. P.
Source PublicationNew Phytologist
2015
Volume205
Issue3
Pages1164-1174
KeywordDuke Free-air Carbon Enrichment(Face) Experiment Exudation Hyphosphere Land Carbon Sink Progressive Nutrient Limitation Rhizosphere Priming Effects Loblolly-pine Forest Extracellular Enzyme-activity Warm-temperate Forest Atmospheric Co2 n Fertilization Mycorrhizal Fungi Organic-matter Root Exudation Soil Carbon Microbial Community
AbstractWhile multiple experiments have demonstrated that trees exposed to elevated CO2 can stimulate microbes to release nutrients from soil organic matter, the importance of root- versus mycorrhizal-induced changes in soil processes are presently unknown. We analyzed the contribution of roots and mycorrhizal activities to carbon (C) and nitrogen (N) turnover in a loblolly pine (Pinus taeda) forest exposed to elevated CO2 by measuring extracellular enzyme activities at soil microsites accessed via root windows. Specifically, we quantified enzyme activity from soil adjacent to root tips (rhizosphere), soil adjacent to hyphal tips (hyphosphere), and bulk soil. During the peak growing season, CO2 enrichment induced a greater increase of N-releasing enzymes in the rhizosphere (215% increase) than in the hyphosphere (36% increase), but a greater increase of recalcitrant C-degrading enzymes in the hyphosphere (118%) than in the rhizosphere (19%). Nitrogen fertilization influenced the magnitude of CO2 effects on enzyme activities in the rhizosphere only. At the ecosystem scale, the rhizosphere accounted for c. 50% and 40% of the total activity of N- and C-releasing enzymes, respectively. Collectively, our results suggest that root exudates may contribute more to accelerated N cycling under elevated CO2 at this site, while mycorrhizal fungi may contribute more to soil C degradation.
Indexed BySCI
Language英语
ISSN0028-646X
DOI10.1111/nph.13122
Citation statistics
Cited Times:27[WOS]   [WOS Record]     [Related Records in WOS]
Document TypeSCI/SSCI论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/38784
Collection历年回溯文献
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GB/T 7714
Meier I. C.,Pritchard, S. G.,Brzostek, E. R.,et al. The rhizosphere and hyphosphere differ in their impacts on carbon and nitrogen cycling in forests exposed to elevated CO2. 2015.
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