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首页> 外文期刊>Ecological research >Leaf carbon isotope ratio and water use efficiency of urban roadside trees in summer in Kyoto city
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Leaf carbon isotope ratio and water use efficiency of urban roadside trees in summer in Kyoto city

机译：京都市夏季城市路边树木的叶片碳同位素比和水分利用效率

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The effect of summer climate on leaf carbon isotope composition (δ~(13)C) of the major roadside tree species Prunus x yedoensis (P. yedoensis) was investigated in Kyoto city, Japan, to explore the implications for alterations in urban environments. Temperature and the vapor pressure deficit were higher at sites of higher traffic volumes, possibly affected by a heat island effect. The leaf δ~(13)C of P. yedoensis trees was affected strongly by leaf carbon isotope discrimination (A), with much less effect of (δ~(13)C on atmospheric CO_2. Leaf A values in the summer were smaller at sites of higher traffic volumes with high atmospheric temperatures, suggesting a higher long-term water use efficiency (WUE) at these sites. Gas exchange measurements of P. yedoensis leaves indeed suggested a higher intrinsic WUE at sites of higher traffic volumes with high atmospheric temperatures. These results suggest that leaf A is related to the response of WUE to summer climates, and that leaf δ~(13)C in urban areas is a useful tracer for understanding the influences of urban environments on plant photosynthetic processes.
机译：在日本京都市，研究了夏季气候对主要路边树种李子（P. yedoensis）叶片碳同位素组成（δ〜（13）C）的影响，以探讨其对城市环境变化的影响。在交通流量较高的地点，温度和蒸气压亏空较高，可能受热岛效应的影响。叶碳同位素判别力（A）对紫杉树叶片δ〜（13）C的影响很大，（δ〜（13）C对大气CO_2的影响较小。大气温度较高的交通流量较高的地点，表明这些地点的长期用水效率（WUE）。紫杉叶片的气体交换测量确实表明，大气流量较高的交通流量较高的地点的固有WUE较高这些结果表明，叶片A与WUE对夏季气候的响应有关，城市地区的叶片δ〜（13）C是了解城市环境对植物光合过程影响的有用示踪剂。

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