The promotional effect of increased growth on transpiration exceeds the inhibitory effect of increased water use efficiency over the life history of Fagus crenata trees
The promotional effect of increased growth on transpiration exceeds the inhibitory effect of increased water use efficiency over the life history of Fagus crenata trees
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DOI：
10.1080/13416979.2022.2035903
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发表时间：
2022-02
影响因子：
1.5
通讯作者：
Tayoko Kubota;A. Kagawa;K. Shichi;K. Ono
中科院分区：
文献类型：
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作者：
Tayoko Kubota;A. Kagawa;K. Shichi;K. Ono
摘要利用1907 - 2012年树木年轮纤维素碳同位素比值（δ 13 CTR）计算了日本毛榉（Fagus crenata）的长期内在水分利用效率（iWUE），以研究气孔对大气CO2浓度（ca）升高的响应。利用δ 13 CTR估算了不同水分利用效率下的蒸腾量。从1907年到2012年，iWUE增加了24.2%，从58.6 μmol·mol−1增加到72.7 μmol·mol−1。此外，长期的E增加了在树的水平，即使在iWUE的增加导致在叶水平的E减少。这些结果可以解释为假设的促进作用，增加树木生物量对每棵树的E，这抵消了抑制作用，增加iWUE对每叶E在树木的生活史。
ABSTRACT The long-term intrinsic water use efficiency (iWUE) of Japanese beech (Fagus crenata), which is widely distributed in northern Japan, was calculated annually from carbon isotope ratios of tree ring cellulose (δ13CTR ) from 1907 to 2012 to examine the stomatal response to rising atmospheric CO2 concentration (ca ). We also estimated transpiration at the tree level (E) from iWUE using δ13CTR . The iWUE increased by 24.2%, from 58.6 to 72.7 μmol·mol−1, from 1907 to 2012 in proportion to the increase in ca . Additionally, long-term E has increased at the tree level, even though an increase in iWUE leads to a decrease in E at the leaf level. These results can be explained by assuming the promotional effect of increased tree biomass on E per tree, which offsets the inhibitory effect of increased iWUE on E per leaf over the life history of the trees.