Architecture and neighbourhood competition of understorey saplings in a subalpine forest in central Japan
Architecture and neighbourhood competition of understorey saplings in a subalpine forest in central Japan
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日本中部亚高山森林林下树苗的建筑和邻里竞赛
DOI：
10.1080/11956860.2003.11682769
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
H. Takeda
中科院分区：
文献类型：
--
作者：
A. Mori;H. Takeda
摘要研究了林下竞争和林上遮荫对三种针叶树幼树构型的影响。veitchii和云杉Picea jezoensis var. hondoensis，在日本中部的亚高山森林中。随着越层遮荫的增加，这两种冷杉的树冠往往比长白冷杉更平坦。hondoensis。由于平坦的树冠提高了在低光可用性下的光截获效率，这两种冷杉似乎更适应遮光。相反，P. jezoensis var. hondoensis似乎更好地适应林隙，因为它的圆锥形树冠提供了更快的高度生长的优势。与A. veitchii，黄毛菊A. mariesii增加了它的茎体积，以支持更大的雪负荷所造成的扁平冠。因此，A. mariesii似乎更适合在下雪的条件下忍受阴影。然而，A. veitchii的高生长速度快，因此其再生性状介于A. mariesii和P.jezoensis var. hondoensis。由于树苗竞争是激烈的树苗拥挤的微型网站条件下，不拥挤的上层条件下，树苗需要更快的高度增长，以逃避其他树苗竞争。相反，由于树苗竞争较弱，在封闭的林下有更多的空间，树苗需要有更平坦的树冠来补偿上层的阴影。种特异性的架构，在这样的生活条件是密切相关的再生特性的三个针叶树研究。
Abstract We investigated the effects of both overstorey shading and understorey sapling competition on the sapling architecture of three conifers, Abies mariesii, A. veitchii, and Picea jezoensis var. hondoensis, in a subalpine forest in central Japan. With increased overstorey shading, the two Abies species tended to have flatter crowns than P. jezoensis var. hondoensis. Because a flattened crown enhances the efficiency of light interception under low light availability, both Abies species appear more adapted to shading. Conversely, P. jezoensis var. hondoensis seems better adapted to canopy gaps, because its conical crown provides an advantage for faster height growth. Unlike A. veitchii, A. mariesii increased its stem volume to support the greater snow-loading resulting from its flattened crown. Therefore, A. mariesii seems better designed for enduring shading under snowy conditions. However, A. veitchii showed faster height growth and thus presents regeneration traits intermediate between those of A. mariesii and P. jezoensis var. hondoensis. Because sapling competition is intense in sapling-crowded microsites conditions under less crowded overstorey conditions, saplings need faster height increase to escape from other sapling competition. Conversely, because sapling competition is weaker and more space is available under a closed understorey, saplings need to have flatter crowns to compensate for overstorey shading. Species-specific architecture in response to such living conditions is closely associated with the regeneration characteristics of the three conifers studied.