Acclimation of foliar respiration and photosynthesis in response to experimental warming in a temperate steppe in northern China.
Acclimation of foliar respiration and photosynthesis in response to experimental warming in a temperate steppe in northern China.
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DOI：
10.1371/journal.pone.0056482
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发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
Wan S
中科院分区：
文献类型：
--
作者：
Chi Y;Xu M;Shen R;Yang Q;Huang B;Wan S
植物叶片呼吸和光合作用的热适应是预测全球变暖下陆地生态系统碳交换变化的关键。在中国北方温带草原进行了提高叶温2.07°C的田间控制试验。克氏针茅（Stipa kryloviiRoshev）叶片暗呼吸对T叶的响应（Rd/T）、光饱和CO2净同化速率对T叶的响应（An/T）、总CO2同化速率（Ag）对T叶的生化限制和扩散限制的响应以及叶片氮浓度对T叶的响应。在2010年（干旱年）和2011年（湿润年）进行了测量。结果表明，Rd对6年的实验性增温具有明显的热适应性，而An对较暖气候的适应能力有限。RD的热锻炼不仅与变暖的直接效应有关，而且与变暖引起的叶片N浓度的变化有关。增温降低了Rd/Ag比值对T叶响应的温度敏感性（Q10）。我们的研究结果可能对改进生态系统模型模拟碳循环和促进对气候变化与生态系统功能之间相互作用的理解具有重要意义。
Thermal acclimation of foliar respiration and photosynthesis is critical for projection of changes in carbon exchange of terrestrial ecosystems under global warming. A field manipulative experiment was conducted to elevate foliar temperature (T leaf) by 2.07°C in a temperate steppe in northern China. R d/T leaf curves (responses of dark respiration to T leaf), A n/T leaf curves (responses of light-saturated net CO2 assimilation rates to T leaf), responses of biochemical limitations and diffusion limitations in gross CO2 assimilation rates (A g) to T leaf, and foliar nitrogen (N) concentration in Stipa krylovii Roshev. were measured in 2010 (a dry year) and 2011 (a wet year). Significant thermal acclimation of R d to 6-year experimental warming was found. However, A n had a limited ability to acclimate to a warmer climate regime. Thermal acclimation of R d was associated with not only the direct effects of warming, but also the changes in foliar N concentration induced by warming. Warming decreased the temperature sensitivity (Q 10) of the response of R d/A g ratio to T leaf. Our findings may have important implications for improving ecosystem models in simulating carbon cycles and advancing understanding on the interactions between climate change and ecosystem functions.
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