Large sensitivity in land carbon storage due to geographical and temporal variation in the thermal response of photosynthetic capacity.
Large sensitivity in land carbon storage due to geographical and temporal variation in the thermal response of photosynthetic capacity.
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DOI：
10.1111/nph.15100
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发表时间：
2018-06
期刊：
影响因子：
--
通讯作者：
Cox PM
中科院分区：
文献类型：
--
作者：
Mercado LM;Medlyn BE;Huntingford C;Oliver RJ;Clark DB;Sitch S;Zelazowski P;Kattge J;Harper AB;Cox PM
植物对温度的反应在地理上各不相同，反映了不同的生境和物种对原产地气候的长期适应。植物还可以适应温度状况的快速时间变化以减轻胁迫。尽管已知植物的光合反应会适应温度，但许多用于预测未来植被和气候-碳相互作用的全球模型并不包括这一过程。我们量化的全球和区域的气候变化和光合能力的温度响应的热适应的影响，陆地碳（C）循环在1860年和2100年之间的耦合气候-碳循环模型，模拟22个全球气候模式。结果表明，光合温度响应中的地理变化对现在和未来的碳吸收是最重要的，在未来变暖的情况下，热驯化的重要性越来越大。考虑到这两种影响，在2100年气候预测中，模拟的全球陆地碳储量的预测范围缩小了（全球和热带分别为29%和43%）。与早期的研究相反，我们的研究结果表明，光合能力的热适应使热带和温带C不太容易受到变暖的影响，但在CO2浓度升高的情况下，减少了北方地区变暖引起的C吸收。
Plant temperature responses vary geographically, reflecting thermally contrasting habitats and long‐term species adaptations to their climate of origin. Plants also can acclimate to fast temporal changes in temperature regime to mitigate stress. Although plant photosynthetic responses are known to acclimate to temperature, many global models used to predict future vegetation and climate–carbon interactions do not include this process. We quantify the global and regional impacts of biogeographical variability and thermal acclimation of temperature response of photosynthetic capacity on the terrestrial carbon (C) cycle between 1860 and 2100 within a coupled climate–carbon cycle model, that emulates 22 global climate models. Results indicate that inclusion of biogeographical variation in photosynthetic temperature response is most important for present‐day and future C uptake, with increasing importance of thermal acclimation under future warming. Accounting for both effects narrows the range of predictions of the simulated global land C storage in 2100 across climate projections (29% and 43% globally and in the tropics, respectively). Contrary to earlier studies, our results suggest that thermal acclimation of photosynthetic capacity makes tropical and temperate C less vulnerable to warming, but reduces the warming‐induced C uptake in the boreal region under elevated CO2.
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