Clarification of dominance mechanism of Sasa in the understory -relationship between resource acquiring and growth of individuals-

矮竹的密集生长对树木的更新造成了遮荫压力。矮秆竹如何在林下茂密的树荫下生长？分析了光照条件与生物量及生长特性的关系。palmata，我们调查了林隙-林下连续体的冠层开放度和生物量。我们还分析了生物量是否依赖于光照强度或距离差距。冠层开放度表现出一种依赖于距差距距离的格局。生物量在差距达到最大值，并逐渐下降到差距的边缘，而在林下保持不变。生物量不依赖于光照强度。这种现象主要可以从两个方面来解释。一是矮秆竹是耐荫树种，其生长特性决定了其适应弱光环境。二是S.掌骨受生理整合的影响。这一结果可能表明，分株间的生理整合通过与相邻分株的光合同化作用实现了补偿生长。

The dense growth of dwarf bamboo creates shade stress against tree regeneration. How can dwarf bamboo grow under deep shade in the understory? To analyze the relations between light conditions and biomass or the growth characteristics of S. palmata, we investigated the canopy-open- ness and biomass at the belt transects set up in the gap-understory continuum. We also analyzed whether the biomass was dependent on light intensity or the distance from the gap. Canopy-openness showed a pattern dependent on the distance from the gap. The biomass peaked at the gap and gradually decreased up to the edges of the gap, while it remained constant in the understory. The biomass did not depend on light intensity. This phenomenon can mainly be interpreted two ways. One is that dwarf bamboo is a shade-tolerant species, and adapts to a low light environment due to its growth characteristics. The second is that S. palmata is subject to physiological integration. The result may indicate that physiological integration among ramets enables a compensatory growth through photoassimilate with connected neighboring ramets.