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Leaf Photosynthetic and Respiratory Thermal Acclimation in Terrestrial Plants in Response to Warming: A Global Synthesis
Global Change Biology ( IF 10.8 ) Pub Date : 2025-01-18 , DOI: 10.1111/gcb.70026
Ting Wu, David T. Tissue, Mingkai Jiang, Martijn Slot, Kristine Y. Crous, Junfeng Yuan, Juxiu Liu, Shaofei Jin, Chenxi Wu, Yan Deng, Chao Huang, Fuxi Shi, Xiong Fang, Rui Li, Rong Mao

Leaf photosynthesis and respiration are two of the largest carbon fluxes between the atmosphere and biosphere. Although experiments examining the warming effects on photosynthetic and respiratory thermal acclimation have been widely conducted, the sensitivity of various ecosystem and vegetation types to warming remains uncertain. Here we conducted a meta‐analysis on experimental observations of thermal acclimation worldwide. We found that the optimum temperature for photosynthetic rate (Topt) and the maximum rate of carboxylation of Rubisco (ToptV) in tropical forest plants increased by 0.51°C and 2.12°C per 1°C of warming, respectively. Similarly, Topt and the optimum temperature for maximum electron transport rate for RuBP regeneration (ToptJ) in temperate forest plants increased by 0.91°C and 0.15°C per 1°C of warming, respectively. However, reduced photosynthetic rates at optimum temperature (Aopt) were observed in tropical forest (17.2%) and grassland (16.5%) plants, indicating that they exhibited limited photosynthetic thermal acclimation to warming. Warming reduced respiration rate (R25) in boreal forest plants by 6.2%, suggesting that respiration can acclimate to warming. Photosynthesis and respiration of broadleaved deciduous trees may adapt to warming, as indicated by higher Aopt (7.5%) and Topt (1.08°C per 1°C of warming), but lower R25 (7.7%). We found limited photosynthetic thermal acclimation in needleleaved evergreen trees (−14.1%) and herbs (−16.3%), both associated with reduced Aopt. Respiration of needleleaved deciduous trees acclimated to warming (reduced R25 and temperature sensitivity of respiration (Q10)); however, broadleaved evergreen trees did not acclimate (increased R25). Plants in grasslands and herbaceous species displayed the weakest photosynthetic acclimation to warming, primarily due to the significant reductions in Aopt. Our global synthesis provides a comprehensive analysis of the divergent effects of warming on thermal acclimation across ecosystem and vegetation types, and provides a framework for modeling responses of vegetation carbon cycling to warming.

中文翻译:


陆生植物叶片光合和呼吸热驯化对变暖的响应:全球综合



叶子的光合作用和呼吸作用是大气和生物圈之间最大的两个碳通量。尽管已经进行了广泛的实验来检验变暖对光合和呼吸热适应的影响,但各种生态系统和植被类型对变暖的敏感性仍然不确定。在这里,我们对全球热驯化的实验观察进行了荟萃分析。我们发现,热带森林植物光合速率 (Topt) 的最佳温度 (Topt) 和 Rubisco 的最大羧化速率 (ToptV) 每升温 1°C 分别增加 0.51°C 和 2.12°C。同样,温带森林植物中 RuBP 再生的最大电子传递速率 (ToptJ) 的最佳温度每升高 1°C 分别增加 0.91°C 和 0.15°C。然而,在热带森林 (17.2%) 和草原 (16.5%) 植物中观察到最佳温度下的光合速率 (Aopt) 降低,表明它们对变暖的光合热适应能力有限。变暖使北方森林植物的呼吸速率 (R25) 降低了 6.2%,表明呼吸可以适应变暖。阔叶落叶树的光合作用和呼吸作用可能适应变暖,如较高的 Aopt (7.5%) 和 Topt (每变暖 1°C 1.08°C) 或较低的 R25 (7.7%) 所示。我们在针叶常绿乔木 (-14.1%) 和草本植物 (-16.3%) 中发现了有限的光合热驯化,这两者都与 Aopt 减少有关。适应变暖的针叶落叶乔木的呼吸作用(R25 降低和呼吸温度敏感性 (Q10));然而,阔叶常绿乔木没有适应(增加了 R25)。 草原和草本物种中的植物对变暖的光合适应能力最弱,这主要是由于 Aopt 的显着减少。我们的全球综合分析了变暖对生态系统和植被类型热适应的不同影响,并为模拟植被碳循环对变暖的响应提供了一个框架。
更新日期:2025-01-18
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