4.5 Article

Seasonality of net carbon exchanges of Mediterranean ecosystems across an altitudinal gradient

期刊

JOURNAL OF ARID ENVIRONMENTS
卷 115, 期 -, 页码 1-9

出版社

ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jaridenv.2014.12.003

关键词

Carbon fixation; Eddy covariance; Evapotranspiration; Photosynthesis; Mediterranean ecosystems; Respiration

资金

  1. Andalusian Regional Government [P08-RNM-3721]
  2. European Union ERDF funds
  3. Spanish Ministry of Science and Innovation [CGL2010-22193-C04-02, CGL2011-27493, CGL2011-15276-E]
  4. European Community's Seventh Framework Programme through GHG-Europe project [FP7-ENV-2009-1.1.3.1, 244122]

向作者/读者索取更多资源

In the present climate change context it is important to understand the carbon balance seasonality of Mediterranean areas, that will suffer important changes in precipitation according to the last climate change predictions. This work analyzed the seasonality of carbon exchanges of three Mediterranean ecosystems according to a variety of water and temperature regimes due to differences in altitude (alpine, subalpine and lowland). Results show that the timing and duration of the growing season depended on temperature at the alpine site, while the dependence on water availability increased as altitude decreased. Thus, maximum values of net carbon uptake occurred in late spring for the alpine and subalpine sites (up to 60 and 30 gC m(-2) month(-1) respectively) whereas the lowland site absorbed carbon throughout winter (up to 30 gC m(-2) month(-1)). Similarly increases in aridity conditions resulted in monthly increases in carbon emissions during dry periods. Thus from May to October, the lowland emitted up to 60 degrees gC degrees m(-2)degrees month(-1), the subalpine emitted half that with a delay of two months, whereas the alpine site continued with slight uptake sequestration. Finally, the EVI could be used to provide reasonably accurate estimates of photosynthesis (R-2 around 0.6) but this relation varies depending on the site. (C) 2014 Elsevier Ltd. All rights reserved.

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