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Ecology, 92(10), 2011, pp. 1994â1998 à 2011 by the Ecological Society of America Forest annual carbon cost: comment BRIAN J. ENQUIST1,2,3 Understanding the relative inï¬uence of abiotic and biotic forces on ecosystem-level processes across broad scale remains a central question in global ecology (Schimel et al. 1996, Chapin et al. 1997, Kerkhoff et al. 2005). In their report, Piao et al. (2010) addressed how global-scale variation in annual terrestrial autotrophic respiration, Ra, varies across broad-scale gradients including temperature, biomass, and successionary age. In addition, they purported to test several predictions and observations from metabolic scaling theory, MST (West et al. 1997) on how temperature and autotrophic biomass inï¬uence rates of ecosystem metabolism and production (Enquist et al. 2007b). While I agree with Piao et al.âs emphasis on the need to assess variation in ecosystem processes across broad gradients, I question their methodology for comparing and standardizing rates of ecosystem production and disagree with their reading of MST. Issues of how to standardize ï¬ux measures in order to compare annual and instantaneous rates across sites are not just speciï¬c to Piao et al.âs study. These issues also apply to other studies assessing spatial variation in ecosystem metabolism across broad
Ecology – Ecological Society of America
Published: Oct 1, 2011
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