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Air temperature optima of vegetation productivity across global biomes

机译:全球生物群落中植被生产力的最佳气温

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摘要

The global distribution of the optimum air temperature for ecosystem-level gross primary productivity (Topteco) is poorly understood, despite its importance for ecosystem carbon uptake under future warming. We provide empirical evidence for the existence of such an optimum, using measurements of in situ eddy covariance and satellite-derived proxies, and report its global distribution. Topteco is consistently lower than the physiological optimum temperature of leaf-level photosynthetic capacity, which typically exceeds 30 °C. The global average Topteco is estimated to be 23±6 ºC, with warmer regions having higher Topteco values than colder regions. In tropical forests, particularly, Topteco is close to growing-season air temperature and is projected to fall below it under all scenarios of future climate, suggesting a limited safe operating space for these ecosystems under future warming.
机译:生态系统一级总初级生产力的最佳气温的全球分布 T o p t e c o 知之甚少,尽管它对于未来变暖对生态系统碳吸收的重要性。我们使用原位涡动协方差和卫星衍生的代理的测量结果,为这种最优的存在提供经验证据,并报告其全球分布。 T < / mi> o p t e c < / mi> o 始终低于叶片水平光合能力的生理最佳温度,该温度通常超过30°C。全球平均 T o p t e c o 估计为23±6ºC,温度较高的区域具有较高的 T o p t e c o 值要比寒冷地区高。特别是在热带森林中, T o p t e c o 接近生长季节的气温,预计在所有情况下都将低于该温度未来气候情景,表明在未来变暖下这些生态系统的安全运行空间有限。

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