globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13713
论文题名:
Dynamics of soil CO2 efflux under varying atmospheric CO2 concentrations reveal dominance of slow processes
作者: Kim D.; Oren R.; Clark J.S.; Palmroth S.; Oishi A.C.; McCarthy H.R.; Maier C.A.; Johnsen K.
刊名: Global Change Biology
出版年: 2017
卷: 23, 期:9
起始页码: 3501
结束页码: 3512
语种: 英语
英文关键词: Bayesian state space model ; carbon dioxide ; climate change ; nitrogen fertilization ; soil respiration
英文摘要: We evaluated the effect on soil CO2 efflux (FCO 2) of sudden changes in photosynthetic rates by altering CO2 concentration in plots subjected to +200 ppmv for 15 years. Five-day intervals of exposure to elevated CO2 (eCO2) ranging 1.0–1.8 times ambient did not affect FCO 2. FCO 2 did not decrease until 4 months after termination of the long-term eCO2 treatment, longer than the 10 days observed for decrease of FCO 2 after experimental blocking of C flow to belowground, but shorter than the ~13 months it took for increase of FCO 2 following the initiation of eCO2. The reduction of FCO 2 upon termination of enrichment (~35%) cannot be explained by the reduction of leaf area (~15%) and associated carbohydrate production and allocation, suggesting a disproportionate contraction of the belowground ecosystem components; this was consistent with the reductions in base respiration and FCO 2-temperature sensitivity. These asymmetric responses pose a tractable challenge to process-based models attempting to isolate the effect of individual processes on FCO2. © 2017 John Wiley & Sons Ltd
资助项目: Kim, D. ; Nicholas School of the Environment, Duke UniversityUnited States ; 电子邮件: dkim27@nd.edu
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60849
Appears in Collections:影响、适应和脆弱性

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作者单位: Nicholas School of the Environment, Duke University, Durham, NC, United States; Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, United States; USDA Forest Service, Southern Research Station, Coweeta Hydrologic Laboratory, Otto, NC, United States; Department of Microbiology and Plant Biology, University of Oklahoma, Norman, OK, United States; USDA Forest Service, Southern Research Station, Research Triangle Park, NC, United States; USDA Forest Service, Southern Research Station, Asheville, NC, United States

Recommended Citation:
Kim D.,Oren R.,Clark J.S.,et al. Dynamics of soil CO2 efflux under varying atmospheric CO2 concentrations reveal dominance of slow processes[J]. Global Change Biology,2017-01-01,23(9)
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