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Size-dependency in hydraulic and photosynthetic properties of three Acer species having different maximum sizes

机译：具有不同最大大小的三种Acer物种在水力和光合特性上的大小相关性

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摘要

Recent studies suggest that physiological traits can be affected by tree size due to stronger hydraulic limitation in taller trees. As trees vary greatly in size, both within and among species, the adaptive responses to hydraulic limitation may be different among species with different maximum sizes. To investigate this, we explored size-dependency in photosynthetic and hydraulic parameters of three Acer species (Acer mono Maxim., Acer amoenum Carr and Acer japonicum Thunb.) using trees of various sizes under well-lit conditions. Leaf stomatal conductance of the Acer species decreased with tree size, implying that water supply to leaves decreases as trees grow. In contrast, content of nitrogen increased with tree size, which may compensate for the decrease in stomatal conductance to maintain the photosynthetic rate. Although the increase in nitrogen and leaf mass per area were larger in species with larger statures, the size-dependency in stomatal conductance was not different among species, and photosynthetic rate and hydraulic conductance were maintained in the three Acer species. Therefore, we suggest that hydraulic limitation on gas exchange does not necessarily depend on the maximum height of the species and that maintenance of photosynthesis and hydraulic properties is a fundamental physiological process during tree growth.
机译：最近的研究表明，由于高大树木中较强的水力限制，树木的大小会影响其生理特性。由于树木在物种内部和物种之间的大小差异很大，因此在具有最大大小的物种之间，对水力限制的适应性响应可能会有所不同。为了对此进行研究，我们在光线充足的条件下，使用各种大小的树木，探索了3种Acer物种（Acer mono Maxim。，Acer amoenum Carr和Acer japonicum Thunb。）光合作用和水力参数的大小相关性。 Acer物种的叶片气孔导度随树的大小而降低，这意味着随着树的生长，叶片的水供应减少。相反，氮的含量随树的大小而增加，这可以补偿气孔导度的降低，以维持光合速率。虽然具有较高身高的物种每单位面积的氮和叶质量的增加较大，但物种间气孔导度的大小相关性没有差异，并且在三种Acer物种中保持了光合速率和水力导通。因此，我们建议对气体交换的水力限制不一定取决于物种的最大高度，并且光合作用和水力特性的维持是树木生长过程中的基本生理过程。

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