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首页> 外文期刊>Ecological research >Plastic changes of leaf mass per area and leaf nitrogen content in response to canopy openings in saplings of eight deciduous broad-leaved tree species
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Plastic changes of leaf mass per area and leaf nitrogen content in response to canopy openings in saplings of eight deciduous broad-leaved tree species

机译：八种落叶阔叶树种幼树的冠层开口对每单位面积叶片质量和叶片氮含量的塑性变化

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摘要

Leaf nitrogen content per area (N_(area)) is a good indicator of assimilative capacity of leaves of deciduous broad-leaved trees. This study examined the degrees of increase in N_(area) in response to canopy openings as leaf mass per area (LMA) and leaf nitrogen content per mass (N_(mass)) in saplings of eight deciduous broad-leaved tree species in Hokkaido, northern Japan. Five of the species were well-branched species with a large number of small leaves (lateral-growth type), and the other three species were less-branched species with a small number of large leaves (vertical-growth type). The degrees of increase in N_(area) were compared between the two crown types. In closed-canopy conditions, leaves of the vertical-growth species tended to have a lower LMA and higher N_(mass) than those of the lateral-growth species, which resulted in similar N_(area) for both. LMA increased in canopy openings in the eight species, and the degrees of increase were not largely different between the lateral- and vertical-growth species. On the contrary, N_(mass) was unchanged in canopy openings in the eight species. As a result, N_(area) of each species increased in canopy openings in proportion to the increase in LMA, and the degrees of increase in N_(area) were similar in the lateral- and vertical-growth species. Therefore, this study showed that the degrees of increase in N_(area) were not correlated with the crown architecture (i.e., the lateral- and vertical-growth types).
机译：单位面积的叶氮含量（N_（面积））是落叶阔叶树叶片同化能力的良好指标。这项研究调查了北海道8种落叶阔叶树种幼树的N_（面积）对冠层开口的响应程度，即每面积的叶质量（LMA）和每质量的叶氮含量（N_（质量）），日本北部。五个物种是分支良好的物种，有大量小叶（侧生型），其他三个物种是分支较少的物种，有少量大叶（垂直生型）。比较了两种冠类型的N_（面积）增加程度。在封闭的冠层条件下，垂直生长物种的叶片倾向于具有比侧向生长物种的叶片更低的LMA和更高的N_（质量），这导致两者的N_（面积）相似。 LMA在这8个物种的树冠开口中增加，并且增加的程度在横向和垂直增长物种之间没有太大差异。相反，在这八个物种的树冠开口中，N_（质量）没有变化。结果，每个树种的N_（面积）与LMA的增加成比例地增加，并且在横向和垂直生长物种中N_（面积）的增加程度相似。因此，这项研究表明N_（面积）的增加程度与冠结构（即横向和垂直生长类型）不相关。

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