Warming alters the metabolic balance of ecosystems
Warming alters the metabolic balance of ecosystems
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DOI：
10.1098/rstb.2010.0038
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发表时间：
2010-07
期刊：
影响因子：
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通讯作者：
G. Yvon‐Durocher;J. I. Jones;M. Trimmer;G. Woodward;J. Montoya;J. Montoya
中科院分区：
文献类型：
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作者：
G. Yvon‐Durocher;J. I. Jones;M. Trimmer;G. Woodward;J. Montoya;J. Montoya
碳循环通过调节大气中的二氧化碳来调节气候变化，它是生态系统提供的最重要的服务之一。然而，在生物群与气候之间的潜在反馈方面仍然存在相当大的不确定性。特别是，目前还不清楚全球变暖将如何影响生态系统尺度上光合固定和呼吸释放CO2之间的代谢平衡。在这里，我们提出了一个组合的实验场数据从淡水围隔生态系统，和来自生态学的代谢理论的理论预测，以调查变暖是否会改变生态系统吸收二氧化碳的能力。我们的操纵实验模拟了预测的世纪末的温度上升，并揭示了生态系统呼吸的增长速度比初级生产快，减少了13%的碳固存，这些结果证实了我们基于这两个过程的不同活化能的理论预测。仅使用整个生态系统的光合作用和呼吸的活化能，我们提供了一个理论预测，准确地量化了实验观察到的碳封存减少的精确幅度。我们认为，全生态系统的操作实验和生态学理论的结合是最有前途的和富有成效的研究领域之一，预测气候变化对关键生态系统服务的影响。
The carbon cycle modulates climate change, via the regulation of atmospheric CO2, and it represents one of the most important services provided by ecosystems. However, considerable uncertainties remain concerning potential feedback between the biota and the climate. In particular, it is unclear how global warming will affect the metabolic balance between the photosynthetic fixation and respiratory release of CO2 at the ecosystem scale. Here, we present a combination of experimental field data from freshwater mesocosms, and theoretical predictions derived from the metabolic theory of ecology to investigate whether warming will alter the capacity of ecosystems to absorb CO2. Our manipulative experiment simulated the temperature increases predicted for the end of the century and revealed that ecosystem respiration increased at a faster rate than primary production, reducing carbon sequestration by 13 per cent. These results confirmed our theoretical predictions based on the differential activation energies of these two processes. Using only the activation energies for whole ecosystem photosynthesis and respiration we provide a theoretical prediction that accurately quantified the precise magnitude of the reduction in carbon sequestration observed experimentally. We suggest the combination of whole-ecosystem manipulative experiments and ecological theory is one of the most promising and fruitful research areas to predict the impacts of climate change on key ecosystem services.