globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13451
论文题名:
Informing climate models with rapid chamber measurements of forest carbon uptake
作者: Metcalfe D.B.; Ricciuto D.; Palmroth S.; Campbell C.; Hurry V.; Mao J.; Keel S.G.; Linder S.; Shi X.; Näsholm T.; Ohlsson K.E.A.; Blackburn M.; Thornton P.E.; Oren R.
刊名: Global Change Biology
出版年: 2017
卷: 23, 期:5
起始页码: 2130
结束页码: 2139
语种: 英语
英文关键词: boreal forest ; earth system model ; model-data integration ; nutrient limitation ; photosynthetic downregulation ; Pinus sylvestris
Scopus关键词: Pinus sylvestris
英文摘要: Models predicting ecosystem carbon dioxide (CO2) exchange under future climate change rely on relatively few real-world tests of their assumptions and outputs. Here, we demonstrate a rapid and cost-effective method to estimate CO2 exchange from intact vegetation patches under varying atmospheric CO2 concentrations. We find that net ecosystem CO2 uptake (NEE) in a boreal forest rose linearly by 4.7 ± 0.2% of the current ambient rate for every 10 ppm CO2 increase, with no detectable influence of foliar biomass, season, or nitrogen (N) fertilization. The lack of any clear short-term NEE response to fertilization in such an N-limited system is inconsistent with the instantaneous downregulation of photosynthesis formalized in many global models. Incorporating an alternative mechanism with considerable empirical support – diversion of excess carbon to storage compounds – into an existing earth system model brings the model output into closer agreement with our field measurements. A global simulation incorporating this modified model reduces a long-standing mismatch between the modeled and observed seasonal amplitude of atmospheric CO2. Wider application of this chamber approach would provide critical data needed to further improve modeled projections of biosphere–atmosphere CO2 exchange in a changing climate. © 2016 John Wiley & Sons Ltd
资助项目: Metcalfe, D.B. ; Department of Physical Geography and Ecosystem Science, Lund UniversitySweden ; 电子邮件: dbmetcalfe@gmail.com
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60978
Appears in Collections:影响、适应和脆弱性

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作者单位: Department of Physical Geography and Ecosystem Science, Lund University, Lund, Sweden; Environmental Sciences Division, Climate Change Science Institute, Oak Ridge National Laboratory, Oak Ridge, TN, United States; Nicholas School of the Environment, Duke University, Durham, NC, United States; Department of Forest Genetics and Plant Physiology, Umeå Plant Science Centre, Swedish University of Agricultural Sciences, Umeå, Sweden; Institute for Sustainability Sciences, Agroscope, Zurich, Switzerland; Southern Swedish Forest Research Centre, Swedish University of Agricultural Sciences, Alnarp, Sweden; Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden

Recommended Citation:
Metcalfe D.B.,Ricciuto D.,Palmroth S.,et al. Informing climate models with rapid chamber measurements of forest carbon uptake[J]. Global Change Biology,2017-01-01,23(5)
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