Woody and scandent plants on the edges of an Andean timberline
Woody and scandent plants on the edges of an Andean timberline
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安第斯林线边缘的木本植物和攀缘植物
DOI：
10.2307/2996657
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发表时间：
1993
影响因子：
--
通讯作者：
K. Young
中科院分区：
文献类型：
--
作者：
K. Young
年轻的肯尼思·R.（科罗拉多大学地理系，博尔德，CO 80309）。安第斯林线边缘的木本植物和攀缘植物。公牛。托里·博特。俱乐部 120：1-18。 1993年。-在秘鲁中北部的里约阿比塞奥国家公园的林线区域检查了森林边缘的结构和组成。在六个 25 x 40 m 的森林地块中对乔木、灌木和攀缘植物物种进行了清查，这些森林地块的长轴垂直于森林-草地边界，并且位于不同的海拔。在所研究的 250 m 海拔梯度范围内，0.1 ha 地块上的乔木和灌木物种数量从 30 种减少到 12 种（从低海拔到高海拔）；在海拔较低的地区（3300-3350 m），有更多的栖息地专家，即明显局限于森林边缘或森林内部的物种。在所有地块中，攀缘植物种类多样（12-20 种/0. 1 公顷）且丰富（总密度为6000-10,000 茎/公顷）。许多是由于树叶和/或树枝形成的角度而悬垂的；没有人可以被归类为森林边缘或室内专家。森林边缘偶尔会受到源自草原的破坏性火灾的影响。林线带森林组成和结构的具体情况受到海拔、距边缘的距离以及过去干扰的性质和强度的影响。
YOUNG, KENNETH R. (Department of Geography, University of Colorado, Boulder, CO 80309). Woody and scandent plants on the edges of an Andean timberline. Bull. Torrey Bot. Club 120: 1-18. 1993. -The structure and composition of forest edges were examined in the timberline zone of Rio Abiseo National Park in north-central Peru. Tree, shrub, and scandent plant species were inventoried in six 25 by 40 m forest plots, positioned with the long axes perpendicular to the forest-grassland boundary, and located at different elevations. Number of tree and shrub species on the 0.1 ha plots decreased from 30 to 12 (lower to higher elevation) over the 250 m elevational gradient studied; at lower elevations (3300-3350 m), there were more habitat specialists, i.e., species apparently restricted to either forest edge or forest interior. In all plots, scandent plant species were diverse (12-20 species/0. 1 ha) and abundant (at total densities of 6000-10,000 stems/ha). Many were scandent by virtue of the angles formed by leaves and/or branches; none could be classified as forest-edge or -interior specialists. Forest margins were variably affected by occasional stand-destroying fires originating in the grasslands. The specifics of forest composition and structure in the timberline zone were influenced by elevation, distance from the edge, and the nature and intensity of past disturbances.