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Title: Effect of climate warming on the annual terrestrial net ecosystem CO 2 exchange globally in the boreal and temperate regions

The net ecosystem CO 2 exchange is the result of the imbalance between the assimilation process (gross primary production, GPP) and ecosystem respiration (RE). The aim of this study was to investigate temperature sensitivities of these processes and the effect of climate warming on the annual terrestrial net ecosystem CO 2 exchange globally in the boreal and temperate regions. A database of 403 site-years of ecosystem flux data at 101 sites in the world was collected and analyzed. Temperature sensitivities of rates of RE and GPP were quantified with Q 10, defined as the increase of RE (or GPP) rates with a temperature rise of 10 °C. Results showed that on the annual time scale, the intrinsic temperature sensitivity of GPP (Q 10sG) was higher than or equivalent to the intrinsic temperature sensitivity of RE (Q 10sR). Q 10sG was negatively correlated to the mean annual temperature (MAT), whereas Q 10sR was independent of MAT. The analysis of the current temperature sensitivities and net ecosystem production suggested that temperature rise might enhance the CO 2 sink of terrestrial ecosystems both in the boreal and temperate regions. Additionally, ecosystems in these regions with different plant functional types should sequester more COmore » 2 with climate warming.« less
Authors:
 [1] ;  [1] ;  [2] ; ORCiD logo [3] ;  [4] ;  [1] ;  [1] ; ORCiD logo [5] ;  [6] ;  [7] ;  [8] ;  [4]
  1. Sun Yat-sen Univ., Guangzhou (China)
  2. European Commission, Ispra (Italy)
  3. Univ. of Innsbruck, Innsbruck (Austria)
  4. ETH Zurich, Zurich (Switzerland)
  5. Georg-August Univ. of Gottingen, Gottingen (Germany)
  6. Univ. of Eastern Finland, Kuopio (Finland)
  7. Hokkaido Univ., Sapporo (Japan)
  8. Hokkaido Univ., Horonobe (Japan)
Publication Date:
Grant/Contract Number:
FG02-04ER63917; FG02-04ER63911
Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 7; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Research Org:
Oregon State Univ., Corvallis, OR (United States)
Sponsoring Org:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; climate-change ecology
OSTI Identifier:
1374891