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作 者 ：闫兴富^1,2;曹敏¹

期 刊 ：应用生态学报 2007年 18卷 01期 页码：23-29

关键词：望天树；

摘 要 ：在不同光照梯度的人工遮荫和森林生境中，研究了西双版纳季节雨林标志树种望天树的种子萌发和幼苗早期生长特征.结果表明，裸地上的强光照和深度遮荫均不利于望天树种子的萌发，中等程度的遮荫有利于种子萌发.望天树种子萌发率在林窗中央最大，而且萌发迅速，林窗边缘和林下生境不利于种子萌发.幼苗株高、基径和单株叶面积等生长指标均在部分遮荫处理条件下最大；幼苗根冠比在裸地上最高，且随遮荫程度的增加而降低；幼苗比叶面积在一定光照强度范围内随遮荫程度的增加而增大，在3层遮荫最大.除幼苗根冠比以外的其它生长参数均在林窗中央最大.讨论了环境因子(主要是光照强度和光质)对望天树种子萌发和幼苗生长的影响.

Abstract:With shading experiment, this paper studied the seed germination and seedling early
growth of Shorea wantianshuea, a representative species in Xishuangbanna seasonal rain forest
under different light intensity and forest habitat. The results showed that both 100% light and deepest
shading did not facilitate the germination of S. wantianshuea seed, while medium shading accelerated
the seed germination. Gap center was more appropriate to the seed germination than gap edge
and under-canopy. The seeds in gap center had the highest germination rate and rapid germination.
Under partially shading, the seedling height, diameter of basal stem, and leaf area per seedling
were in their peak, while the root-shoot ratio decreased with increasing shading and achieved its
maximum under 100% light. The specific leaf area increased with increasing shading in a certain
range, and peaked under 42% light. Gap center was beneficial to the early seedling growth, with
all growth parameters except rootshoot ratio peaked there. The effects of environmental factors,
mainly light intensity and quality, on the seed germination and seedling growth of S. wantianshuea
were discussed.

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