Subtropical to boreal convergence of tree-leaf temperatures

Brent R. Helliker; Suzanna L. Richter

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Subtropical to boreal convergence of tree-leaf temperatures

机译：亚热带至北亚热带树叶温度的收敛

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The oxygen isotope ratio (δ~(18)O) of cellulose is thought to provide a record of ambient temperature and relative humidity during periods of carbon assimilation. Here we introduce a method to resolve tree-canopy leaf temperature with the use of δ~(18)O of cellulose in 39 tree species. We show a remarkably constant leaf temperature of 21.4 ± 2.2℃ across 50° of latitude, from subtropical to boreal biomes. This means that when carbon assimilation is maximal, the physiological and morphological properties of tree branches serve to raise leaf temperature above air temperature to a much greater extent in more northern latitudes. A main assumption underlying the use of δ~(18)O to reconstruct climate history is that the temperature and relative humidity of an actively photo-synthesizing leaf are the same as those of the surrounding air. Our data are contrary to that assumption and show that plant physiological ecology must be considered when reconstructing climate through isotope analysis. Furthermore, our results may explain why climate has only a modest effect on leaf economic traits in general.

机译：纤维素的氧同位素比（δ〜（18）O）被认为可提供碳同化期间环境温度和相对湿度的记录。在此，我们介绍了一种利用39种树种中纤维素的δ〜（18）O解决树冠叶片温度的方法。从亚热带到北方生物群落，我们在50°纬度上显示21.4±2.2℃的叶片温度非常恒定。这意味着，当碳同化达到最大时，树枝的生理和形态特性可在更多的北纬地区将叶子温度提高到高于空气温度的更大程度。使用δ〜（18）O重建气候历史的主要假设是，活性光合叶片的温度和相对湿度与周围空气的温度和相对湿度相同。我们的数据与该假设相反，并且表明通过同位素分析重建气候时必须考虑植物生理生态。此外，我们的结果可以解释为什么气候总体上仅对叶片经济性状产生适度影响。

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《Nature》 |2008年第7203期|p.511-514|共4页
作者
Brent R. Helliker; Suzanna L. Richter;
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作者单位

Department of Biology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种 eng
中图分类自然科学总论;
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Subtropical to boreal convergence of tree-leaf temperatures

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