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Elevated CO2 maintains grassland net carbon uptake under a future heat and drought extreme

机译:在未来的高温和干旱极端条件下二氧化碳含量升高可维持草原的净碳吸收量

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摘要

Extreme climatic events (ECEs) such as droughts and heat waves are predicted to increase in intensity and frequency and impact the terrestrial carbon balance. However, we lack direct experimental evidence of how the net carbon uptake of ecosystems is affected by ECEs under future elevated atmospheric CO2 concentrations (eCO2). Taking advantage of an advanced controlled environment facility for ecosystem research (Ecotron), we simulated eCO2 and extreme cooccurring heat and drought events as projected for the 2050s and analyzed their effects on the ecosystem-level carbon and water fluxes in a C3 grassland. Our results indicate that eCO2 not only slows down the decline of ecosystem carbon uptake during the ECE but also enhances its recovery after the ECE, as mediated by increases of root growth and plant nitrogen uptake induced by the ECE. These findings indicate that, in the predicted near future climate, eCO2 could mitigate the effects of extreme droughts and heat waves on ecosystem net carbon uptake.
机译:预计干旱和热浪等极端气候事件(ECE)的强度和频率会增加,并影响地球的碳平衡。但是,我们缺乏直接的实验证据,说明在未来升高的大气CO2浓度(eCO2)下,生态系统的净碳吸收量如何受到ECE的影响。利用先进的可控环境设施进行生态系统研究(Ecotron),我们模拟了2050年代预计的eCO2以及极端同时发生的热和干旱事件,并分析了它们对C3草原生态系统级碳和水通量的影响。我们的结果表明,eCO2不仅减缓了ECE期间生态系统碳吸收的下降,而且增强了ECE之后的生态系统碳吸收,这是由ECE诱导的根部生长和植物氮吸收增加所介导的。这些发现表明,在预计的不久的将来的气候中,eCO2可以减轻极端干旱和热浪对生态系统净碳吸收的影响。

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