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Heterophyllous Shoots of Japanese Larch Trees: The Seasonal and Yearly Variation in CO

机译：日本落叶松树的异常射击：CO的季节性和年度变化

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摘要

Japanese larch (Larix kaempferi = L. leptolepis) is often characterized by its high growth rate with heterophyllous shoots, but the functional differences of heterophyllous shoots still remain unclear. Recently, abrupt high temperature and drought during spring induced high photosynthetic rate via change in leaf morphology of the deciduous habit. In order to reveal the photosynthetic characteristics of both short and long-shoot needles of sunny canopy of the larch trees using a canopy tower, we calculated the seasonal change of gas exchange characters and leaf mass per area (LMA) and foliar nitrogen content (N) of heterophyllous needles: short and long-shoot needles over 3 years. No marked difference in light-saturated photosynthetic rates (Psat) was observed between short and long shoots after leaf maturation to yellowing, although the difference was obvious in a specific year, which only shows that seasonal change in temperature and soil moisture determines the in situ photosynthetic capacity of needles. The large annual and seasonal variations in Psat in both shoots were found to be mainly determined by climatic variations, while shoot types determined the strategy of their photosynthetic N utilization as well as the stomatal regulation.
机译：日本落叶松（Larix Kaempferi = L.Leptolepis）通常具有含有异质芽的高生长速率，但异质芽的功能差异仍然不清楚。最近，突然在春季诱导的高温和干旱期间通过落叶习惯的叶片形态的变化诱导高光合速率。为了揭示使用树木塔的落叶树落山阳光冠层的短射针的光合特性，我们计算了季节性变化的季节性变化和叶片含量（LMA）和叶状氮含量（n ）异味针：短而长的射击3年。在叶片成熟到泛黄后，在短期和长的枝条之间观察到光饱和光合速率（PSAT）的显着差异，尽管在特定年份中差异显而易见，但只表明了这种温度和土壤水分的季节变化决定了原位针的光合容量。发现两次射击中的PSAt的大型和季节变化主要由气候变化决定，而射击类型确定了它们的光合N利用率以及气孔调节的策略。

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