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首页> 外文期刊>Ecological research >Differences in beech (Fagus crenata) regeneration between two types of Japanese beech forest and along a snow gradient
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Differences in beech (Fagus crenata) regeneration between two types of Japanese beech forest and along a snow gradient

机译：两种类型的日本山毛榉林和沿雪坡的山毛榉（Fagus crenata）再生差异

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摘要

Differences in beech (Fagus crenata) regeneration were quantitatively investigated using power function analysis for the size-class (diameter at breast height, DBH) distribution and juvenile-to-canopy tree (J/C) ratio along a snow gradient throughout Japan. In snowy areas, all species combined, as well as F. crenata alone, showed constant regeneration, with parameter b ≈ -1.6 for the power function y = ax~b (x = DBH, y = density), which is related to the DBH-class distribution. The good fit of the data to the function suggests that beech regenerates constantly with self-thinning patch dynamics. Parameter a, which indicates the abundance of small trunks, was high. Furthermore, the mean J/C ratio was ≈8, i.e., each parent beech tree produced eight juveniles. These results suggest that beech regenerates constantly with gap dynamics in snowy beech forests on the Japan Sea side of Japan (snowy). However, the fit of F. crenata was lower and nonsignificant in some forests in less snowy areas, despite the high fit of all species combined. In these areas, the mean of a was low, and b was often near zero for F. crenata regressions. These results suggest that the abundance of beech was low, and self-thinning was not evident because of the initial low abundance. Moreover, the mean J/C ratio was < 1.0, suggesting that juvenile density was lower than that of canopy trees. Thus, the regeneration of F. crenata on the Pacific Ocean side of Japan (less snowy) is rather sporadic. Less snowy conditions may promote seed desiccation, predation of beechnuts and seedlings, and water stress. Lower F. crenata density may also reduce predator satiation and wind pollination.
机译：使用幂函数分析对整个日本的雪坡上的大小类（胸径直径，DBH）分布和幼树/树冠比（J / C）进行幂函数分析，定量研究了山毛榉（Fagus crenata）再生的差异。在多雪的地区，所有物种结合在一起，以及单独的樱桃花朵，都显示出持续的再生，幂函数y = ax〜b（x = DBH，y =密度）的参数b≈-1.6。 DBH类分发。数据与功能的良好吻合表明，山毛榉具有自我稀疏的斑块动态特性，可不断再生。表示小树干丰度的参数a高。此外，平均J / C比为≈8，即每个父山毛榉树产生8个幼体。这些结果表明，在日本（雪域）日本海一侧的雪山毛榉森林中，山毛榉不断地以间隙动态不断再生。然而，尽管所有物种的合体性很高，但在雪少地区的一些森林中，樱桃小花木的适合度较低且不显着。在这些区域中，a。的平均值较低，而b。crenata回归的b经常接近零。这些结果表明，山毛榉的丰度很低，并且由于最初的丰度低，自稀薄性不明显。而且，平均J / C比＜1.0，表明幼虫的密度低于冠层树的幼虫。因此，在日本的太平洋一侧（雪少的情况下）樱桃小球藻的再生是零星的。少雪的条件可能会促进种子干燥，山毛榉和幼苗的捕食以及水分胁迫。较低的F. crenata密度也可能减少捕食者的饱腹感和风授粉。

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