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首页> 外文期刊>IAWA Journal >Ecological wood anatomy of Alnus nepalensis (Betulaceae) throughout Nepal
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Ecological wood anatomy of Alnus nepalensis (Betulaceae) throughout Nepal

机译：尼泊尔桤木（Betulaceae）的生态木质解剖学

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摘要

Variation in the wood structure of Alnus nepalensis D. Don (Betulaceae) in relation to tree size and habitat altitude was studied in four areas of Nepal: Tamur, Rolwaling, Budi Gandaki, and Bajhang-Khaptad. Alnus nepalensis is a pioneer tree distributed in the Himalayas from northern India to southwestern China and grows throughout Nepal in a wide attitudinal range from 200 m in the tropical zone to 3030 m at the upper limit of the temperate zone. Ecological trends in the wood structure of Alnus nepalensis varied between the studied areas, distinct in the Tamur area, but indistinct in other areas, and tended to be detected in areas with specimens from altitudinal ranges of 2000 m. When all the specimens were separated at 1800 in in elevation and analyzed as two attitudinal groups, features of vessel size and distribution and the ratio of solitary vessels had a significant correlation with tree height in both groups, and tall trees tended to have larger, more solitary vessels. Vessel element and fiber lengths did not have any significant trends in the lower group but had a negative correlation with altitude in the upper group along with the reduction of tree height. Thus, vessel size seems to facilitate the height growth of this pioneer tree, and shorter tracheary elements and more vessel multiples seem to be related to the adaptation of smaller trees at higher elevations.
机译：在尼泊尔四个地区研究了与树尺寸和栖息地的树木结构的变化，在尼泊尔四个地区研究了树尺寸和栖息地海拔高度：Tamur，Rolwaling，Budi Gandaki和Bajhang-Khaptad。 Alnus Nepalensis是一棵在印度北部到中国西南部的喜马拉雅山的先锋树，在热带区200米的众多历态范围内在尼泊尔中生长至3030米处的温带区。在研究区域之间的桤木木结构中的生态趋势，在Tamur面积中不同，但在其他区域中模糊不清，并在从2000米的平坦范围的标本的区域中倾向于检测到。当所有样品在升高中以1800分离并分析为两个态度组时，血管尺寸和分布的特征和孤血管的比例与两组的树高与树高的相关性，高大的树木往往具有更大的树木孤独的船只。血管元素和纤维长度在下部组没有任何显着趋势，但在上部组中与高度的负相关性以及树高的降低。因此，血管尺寸似乎有助于这种先锋树的高度生长，并且短气管元素和更多血管倍数似乎与更高升高的较小树的改编有关。

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