The oxygen stable isotope composition of plant organic matter (OM) (particu'/> The oxygen isotope enrichment of leaf-exported assimilates – does it always reflect lamina leaf water enrichment?
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首页> 美国卫生研究院文献>Wiley-Blackwell Online Open >The oxygen isotope enrichment of leaf-exported assimilates – does it always reflect lamina leaf water enrichment?
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The oxygen isotope enrichment of leaf-exported assimilates – does it always reflect lamina leaf water enrichment?

机译：出口叶片的同化物的氧同位素富集-它总是反映出叶片叶片水富集吗？

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class="unordered" style="list-style-type:disc">The oxygen stable isotope composition of plant organic matter (OM) (particularly of wood and cellulose in the tree ring archive) is valuable in studies of plant–climate interaction, but there is a lack of information on the transfer of the isotope signal from the leaf to heterotrophic tissues.We studied the oxygen isotopic composition and its enrichment above source water of leaf water over diel courses in five tree species covering a broad range of life forms. We tracked the transfer of the isotopic signal to leaf water-soluble OM and further to phloem-transported OM.Observed leaf water evaporative enrichment was consistent with values predicted from mechanistic models taking into account nonsteady-state conditions. While leaf water-soluble OM showed the expected 18O enrichment in all species, phloem sugars were less enriched than expected from leaf water enrichment in Scots pine (Pinus sylvestris), European larch (Larix decidua) and Alpine ash (Eucalyptus delegatensis).Oxygen atom exchange with nonenriched water during phloem loading and transport, as well as a significant contribution of assimilates from bark photosynthesis, can explain these phloem 18O enrichment patterns. Our results indicate species-specific uncoupling between the leaf water and the OM oxygen isotope signal, which is important for the interpretation of tree ring data.
机译：class =“ unordered” style =“ list-style-type：disc”> <！-list-behavior = unordered prefix-word = mark-type = disc max-label-size = 0-> 植物有机质（OM）的氧稳定同位素组成（尤其是树环档案中的木材和纤维素）在植物与气候之间的相互作用研究中很有价值，但缺乏有关同位素信号从植物中转移的信息。 我们研究了5种树木的diel历程中氧同位素组成及其在叶水源水上方的富集情况，这些树涵盖了广泛的生命形式。我们跟踪了同位素信号向叶片水溶性OM的迁移，并进一步向韧皮部转运的OM迁移。 观察到的叶片水分蒸发富集与考虑非稳态条件的机械模型预测值一致。叶片水溶性有机质在所有物种中均表现出预期的 18 O富集，韧皮部糖的富集程度低于在樟子松（Pinus sylvestris），欧洲落叶松（Larix decidua）和高山中的叶水富集所预期的。 在韧皮部装载和运输过程中与未浓缩水交换氧原子，以及树皮光合作用的同化物的重大贡献，可以解释这些韧皮部 18 O浓缩模式。我们的结果表明叶片水与OM氧同位素信号之间的物种特异性解耦，这对于解释年轮数据很重要。

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