Forest annual carbon cost: a global-scale analysis of autotrophic respiration

Shilonog Piao*, Sebastiaan Luyssaert, Philippe Ciais, Ivan A. Janssens, Anping Chen, C. A O Chao, Jingyun Fang, Pierre Friedlingstein, L. U O Yiqi, Shaopeng Wang

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

Forest autotrophic respiration (Ra) plays an important role in the carbon balance of forest ecosystems. However, its drivers at the global scale are not well known. Based on a global forest database, we explore the relationships of annual Ra with mean annual temperature (MAT) and biotic factors including net primary productivity (NPP), total biomass, stand age, mean tree height, and maximum leaf area index (LAI). The results show that the spatial patterns of forest annual Ra at the global scale are largely controlled by temperature. Ra is composed of growth (R g) and maintenance respiration (Rm). We used a modified Arrhenius equation to express the relationship between Ra and MAT. This relationship was calibrated with our data and shows that a 10 °C increase in MAT will result in an increase of annual R m by a factor of 1.9-2.5 (Q10). We also found that the fraction of total assimilation (gross primary production, GPP) used in R a is lowest in the temperate regions characterized by a MAT of ∼ 11°C. Although we could not confirm a relationship between the ratio of Ra to GPP and age across all forest sites, the Ra to GPP ratio tends to significantly increase in response to increasing age for sites with MAT between 8° and 12°C. At the plant scale, direct up-scaled Ra estimates were found to increase as a power function with forest total biomass; however, the coefficient of the power function (0.2) was much smaller than that expected from previous studies (0.75 or 1). At the ecosystem scale, Ra estimates based on both GPP - NPP and TER - Rh (total ecosystem respiration - heterotrophic respiration) were not significantly correlated with forest total biomass (P > 0.05) with either a linear or a power function, implying that the previous individual-based metabolic theory may be not suitable for the application at ecosystem scale.

Original languageEnglish
Pages (from-to)652-661
Number of pages10
JournalEcology
Volume91
Issue number3
Early online date1 Mar 2010
DOIs
Publication statusPublished - Mar 2010

Keywords

  • Acclimation
  • Autotrophic
  • Carbon cycle
  • Carbon-use efficiency
  • Forest ecosystems
  • Growth respiration
  • Maintenance respiration
  • Metabolic theory
  • Respiration (r)
  • Temperature sensitivity

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