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Convergence of terrestrial plant production across global climate gradients
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Convergence of terrestrial plant production across global climate gradients
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Convergence of terrestrial plant production across global climate gradients
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Journal Article
Convergence of terrestrial plant production across global climate gradients
2014
Overview
Variation in terrestrial net primary production (NPP) with climate is thought to originate from a direct influence of temperature and precipitation on plant metabolism. However, variation in NPP may also result from an indirect influence of climate by means of plant age, stand biomass, growing season length and local adaptation. To identify the relative importance of direct and indirect climate effects, we extend metabolic scaling theory to link hypothesized climate influences with NPP, and assess hypothesized relationships using a global compilation of ecosystem woody plant biomass and production data. Notably, age and biomass explained most of the variation in production whereas temperature and precipitation explained almost none, suggesting that climate indirectly (not directly) influences production. Furthermore, our theory shows that variation in NPP is characterized by a common scaling relationship, suggesting that global change models can incorporate the mechanisms governing this relationship to improve predictions of future ecosystem function.
Net primary production is affected by temperature and precipitation, but whether this is a direct kinetic effect on plant metabolism or an indirect ecological effect mediated by changes in plant age, plant biomass or growing season length is unclear — this study develops metabolic scaling theory to be able to answer this question and applies it to a global data set of plant productivity, concluding that it is indirect effects that explain the influence of climate on productivity, which is characterized by a common scaling relationship across climate gradients.
Plant productivity response to climate
Net primary production is affected by temperature and precipitation, but is this a direct effect on plant metabolism or an indirect ecological effect mediated by changes in growing season length and plant biomass? Here, Sean Michaletz
et al
. develop metabolic scaling theory to test the relative importance of direct and indirect climate effects. Applying their model to a global data set of plant productivity, the authors conclude that it is indirect effects that explain the influence of climate on productivity. Temperature and water availability are fundamental drivers of plant physiology and ecosystem metabolism at local scales, but at global scales climate influences net primary production indirectly via plant age and stand biomass, which is largely driven by maximum plant size.
