• Short‐term temperature response curves of leaf dark respiration (R–T) provide insights into a critical process that influences plant net carbon exchange. This includes how respiratory traits acclimate to sustained changes in the environment.
• Our study analysed 860 high‐resolution R–T (10–70°C range) curves for: (a) 62 evergreen species measured in two contrasting seasons across several field sites/biomes; and (b) 21 species (subset of those sampled in the field) grown in glasshouses at 20°C : 15°C, 25°C : 20°C and 30°C : 25°C, day : night.
• In the field, across all sites/seasons, variations in R₂₅ (measured at 25°C) and the leaf T where R reached its maximum (T_max) were explained by growth T (mean air‐T of 30‐d before measurement), solar irradiance and vapour pressure deficit, with growth T having the strongest influence. R₂₅ decreased and T_max increased with rising growth T across all sites and seasons with the single exception of winter at the cool‐temperate rainforest site where irradiance was low. The glasshouse study confirmed that R₂₅ and T_max thermally acclimated.
• Collectively, the results suggest: (1) thermal acclimation of leaf R is common in most biomes; and (2) the high T threshold of respiration dynamically adjusts upward when plants are challenged with warmer and hotter climates.

中文翻译：

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跨热对比生物群落的叶片呼吸温度响应的适应。

• 叶暗呼吸（RT）的短期温度响应曲线为影响植物净碳交换的关键过程提供了见识。这包括呼吸性状如何适应环境的持续变化。
• 我们的研究分析了860条高分辨率的R–T（10–70°C范围）曲线，这些曲线包括：（a）在两个不同季节的几个野外场所/生物群落中测得的62种常绿树种；（b）21种（在野外采样的子集）在日间：夜晚在20℃：15℃，25℃：20℃和30℃：25℃的温室中生长。
• 在现场，在所有站点/季节，在变型- [R ₂₅（在25℃下测量）和叶Ť其中[R达到最大值（Ť_最大）通过生长解释Ť（平均空气Ť的30-d测量之前），太阳辐照度和蒸气压不足，其中生长T的影响最大。在所有地点和季节，R ₂₅下降，T _max随着增长T的增加而增加，唯一的例外是在低温低辐射雨林的冬季冬季。温室研究证实，R ₂₅和T _max热适应。
• 总体而言，结果表明：（1）在大多数生物群落中，叶片R的热驯化很普遍；（2）当植物面临温暖和炎热的气候挑战时，高T呼吸阈值会动态向上调节。