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Differential responses of ecosystem respiration components to experimental warming in a meadow grassland on the Tibetan Plateau
Chen J.; Luo, Y. Q.; Xia, J. Y.; Shi, Z.; Jiang, L. F.; Niu, S. L.; Zhou, X. H.; Cao, J. J.
Source PublicationAgricultural and Forest Meteorology
2016
Volume220
Pages21-29
KeywordEcosystem respiration Soil respiration Total autotrophic respiration Heterotrophic respiration Experimental warming Tibetan Plateau carbon-cycle feedback open-top chambers soil co2 efflux autotrophic respiration thermal-acclimation climate-change alpine meadow heterotrophic respiration temperature sensitivity microbial respiration
AbstractGlobal warming is anticipated to have profound effects on terrestrial carbon fluxes and thus feed backs to future climate change. Ecosystem respiration (R-eco) is one of the dominant components of biosphere CO2 fluxes, but the effects of warming on Reco are still unclear. A field warming experiment using open top chambers (OTCs) was conducted in a meadow grassland on the Tibetan Plateau to study the effects of warming on the components of Reco. Warming significantly enhanced above-ground plant respiration (R-agb) and total autotrophic plant respiration (R-plant 1 by 28.7% and 19.9%, respectively, but reduced heterotrophic respiration (R-h) by 10.4%. These different responses resulted in the insensitive responses of Reco and soil respiration (R-s) to the experimental warming. The warming treatment also increased R-plant/R-eco and R-agb/R-eco. by 8.4% and 17.3%, respectively, while decreasing R-h/R-eco, by 19.0%, suggesting that warming could eventually cause R-eco to be dominated by R-plant. Enhancements in Roam and R-agb were related to the warming-induced increases in aboveground biomass (AGB) while reduced R-h was closely coupled with warming-induced decrease of microbial biomass carbon. Our results highlight that the differential responses of the components of R-eco to different environmental physics under warming scenarios should be taken into consideration to project the future carbon-climate feed backs. (C) 2016 Elsevier B.V. All rights reserved.
Indexed BySCI
Language英语
ISSN0168-1923
DOI10.1016/j.agrformet.2016.01.010
Citation statistics
Cited Times:42[WOS]   [WOS Record]     [Related Records in WOS]
Document TypeSCI/SSCI论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/42884
Collection历年回溯文献
Recommended Citation
GB/T 7714
Chen J.,Luo, Y. Q.,Xia, J. Y.,et al. Differential responses of ecosystem respiration components to experimental warming in a meadow grassland on the Tibetan Plateau. 2016.
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