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首页> 外文期刊>Global change biology >Leaf respiration is differentially affected by leaf vs. stand-level night-time warming
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Leaf respiration is differentially affected by leaf vs. stand-level night-time warming

机译：叶片呼吸受立式和夜间夜间变暖的影响不同

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Plant respiration is an important physiological process in the global carbon cycle serving as a major carbon flux from the biosphere to the atmosphere. Respiration is sensitive to temperature providing a link between environmental variability, climate change and the global carbon cycle. We measured leaf respiration in Populus deltoides after manipulating the air temperature surrounding part of a single leaf, and compared this to the temperature response of the same leaves after manipulating the temperature of the stand. The short-term temperature response of respiration (Q(10) - change in the respiration rate with a 10 degreesC increase in leaf temperature) was 1.7 when the leaf temperature was manipulated, but 2.1 when the stand-level temperature was changed. As a result, total night-time carbon release during the five-day experiment was 21% lower when using the Q(10) estimates from the tradition leaf manipulation compared to the stand-level manipulation. We conclude that the temperature response of leaf respiration is related to whole plant carbon and energy demands, and that appropriate experimental procedures are required in examining respiratory CO2 release under variable temperature conditions.
机译：植物呼吸是全球碳循环中重要的生理过程，是从生物圈到大气的主要碳通量。呼吸对温度敏感，提供了环境变异性，气候变化与全球碳循环之间的联系。我们在处理了单叶周围的空气温度后，测量了黑杨的叶片呼吸，并将其与处理林分温度后的相同叶片的温度响应进行了比较。操纵叶片温度时，呼吸的短期温度响应（Q（10）-呼吸速率随叶片温度每升高10摄氏度而变化）为1.7，而改变标准温度时为2.1。结果，与常规水平操作相比，使用传统叶片操作的Q（10）估计值时，为期5天的实验在夜间的总碳排放降低了21％。我们得出的结论是，叶片呼吸的温度响应与整个植物的碳和能量需求有关，并且需要适当的实验程序来检查在可变温度条件下的呼吸道CO2释放。

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