Long-term warming amplifies shifts in the carbon cycle of experimental ponds
Long-term warming amplifies shifts in the carbon cycle of experimental ponds
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DOI：
10.1038/nclimate3229
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发表时间：
2017-03
影响因子：
30.7
通讯作者：
G. Yvon‐Durocher;Chris J. Hulatt;G. Woodward;M. Trimmer
中科院分区：
文献类型：
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作者：
G. Yvon‐Durocher;Chris J. Hulatt;G. Woodward;M. Trimmer
湖泊和池塘只覆盖了地球非冰川表面的4%，但它们是甲烷和二氧化碳的不成比例的大来源。实际上，非常小的池塘（例如，<0.001平方公里）可能占内陆沃茨所有甲烷排放量的大约40%。因此，了解水生生态系统的温室气体排放将如何应对全球变暖，对于预测生物圈碳循环反馈至关重要。在这里，我们提出的温室气体通量和生态系统代谢率在实验池塘变暖的长期影响的研究结果。我们发现，在CH 4和CO2通量的变化，总初级生产力和生态系统呼吸率，在第一年观察到的放大超过7年的变暖。在经历了七年的变暖之后，吸收二氧化碳的能力几乎减少了一半。温室气体通量的物候也发生了变化，CO2下降和CH 4排放峰值提前一个月在温暖的治疗。这些研究结果表明，气候变暖可以在数年内从根本上改变小池塘的碳平衡，降低其封存二氧化碳的能力，增加甲烷的排放量;这种积极的反馈最终可能会加速气候变化。
Lakes and ponds cover only about 4% of the Earth’s non-glaciated surface, yet they represent disproportionately large sources of methane and carbon dioxide,,. Indeed, very small ponds (for example, <0.001 km2) may account for approximately 40% of all CH4emissions from inland waters. Understanding how greenhouse gas emissions from aquatic ecosystems will respond to global warming is therefore vital for forecasting biosphere–carbon cycle feedbacks. Here, we present findings on the long-term effects of warming on the fluxes of GHGs and rates of ecosystem metabolism in experimental ponds. We show that shifts in CH4and CO2fluxes, and rates of gross primary production and ecosystem respiration, observed in the first year became amplified over seven years of warming. The capacity to absorb CO2was nearly halved after seven years of warmer conditions. The phenology of greenhouse gas fluxes was also altered, with CO2drawdown and CH4emissions peaking one month earlier in the warmed treatments. These findings show that warming can fundamentally alter the carbon balance of small ponds over a number of years, reducing their capacity to sequester CO2and increasing emissions of CH4; such positive feedbacks could ultimately accelerate climate change.