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首页> 外文期刊>Tree Physiology >Variations in transpiration rate and leaf cell turgor maintenance in saplings of deciduous broad-leaved tree species common in cool temperate forests in Japan
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Variations in transpiration rate and leaf cell turgor maintenance in saplings of deciduous broad-leaved tree species common in cool temperate forests in Japan

机译：日本凉爽温带森林中常见的落叶阔叶树种幼树的蒸腾速率和叶细胞养分维持的变化

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To clarify mechanisms underlying variation in transpiration rate among deciduous broad-leaved tree species, we measured diurnal changes in stomatal conductance (g(s)) and leaf water potential, and calculated the maximum transpiration rate (E-max), leaf-specific hydraulic conductance (Ks-1) and difference between the soil water potential and the daily minimum leaf water potential (Psi(s) - Psi(1,min))- Pressure-volume (P-V) measurements were made on leaves. Saplings of eight broad-leaved tree species that are common in Japanese cool temperate forests were studied. Maximum transpiration rate varied significantly among species. There was a statistically significant difference in Psi(s) - Psi(1,min) but not in Ks-1. Species with large E-max also had large Psi(s) - Psi(1,min) and g(s). The results of the P-V analyses showed that species with a large Psi(s) - Psi(1,min) maintained turgor even at low leaf water potentials. The similar daily minimum leaf pressure potentials (Psi(p)) across all eight species indicate that Psi(p) values below this minimum are critical. Based on these results, we suggest that the leaf cell capacity for turgor maintenance strongly affects Psi(s) - Psi(1,min) and consequently E-max via stomatal regulation.
机译：为了弄清落叶阔叶树种蒸腾速率变化的潜在机制，我们测量了气孔导度（g（s））和叶片水势的日变化，并计算了最大蒸腾速率（E-max），叶片特异性水力电导率（Ks-1）以及土壤水势与日最低叶水势之间的差（Psi（s）-Psi（1，min））-在叶片上进行压力-体积（PV）测量。研究了八种阔叶树种的树苗，这些树种在日本凉爽的温带森林中很常见。不同物种间最大蒸腾速率差异很大。 Psi（s）-Psi（1，min）有统计学上的显着差异，但Ks-1没有。具有最大E-max的物种也具有较大的Psi（s）-Psi（1，min）和g（s）。 P-V分析的结果表明，即使在低叶片水势下，具有较大Psi（s）-Psi（1，min）的物种仍保持膨大。所有八个物种的相似的每日最小叶片压力势（Psi（p））表明，低于此最小值的Psi（p）值很关键。根据这些结果，我们建议保持气孔的叶细胞能力强烈影响Psi（s）-Psi（1，min），并因此通过气孔调节影响E-max。

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