摘要
对辽宁东部山区天然次生林中 5种主要阔叶树幼树 (2年生 ) ,进行人工控制光照强度模拟试验 ,研究其主要生理特性。结果表明 ,5种阔叶树在极弱光照条件下 (透光 10 % )光合作用弱 ,最大净光合速率在 4～ 6 μmolCO2 ·m-2 ·s-1,不同树种间差异不大 ;随着光环境的改变 ,光合作用加强 ,树种间差异较大 ,紫椴、水曲柳、花曲柳光合速率提高缓慢 ,黄菠萝、蒙古栎光合速率提高迅速 ;紫椴、水曲柳、花曲柳的光补偿点、暗呼吸速率均较低 ,能利用较弱的光进行物质积累 ;黄菠萝、蒙古栎的光饱和点高 ,光合作用潜力大 ,能充分利用林内较大的光斑 ;光照环境的改变 ,幼树干物质积累发生变化。椴树、水曲柳、花曲柳全光区生物量是弱光区 (透光10 % )的 2 91～ 5 4 4倍 ,黄菠萝、蒙古栎全光区生物量是弱光区 (透光 10 % )的 16 6 2～ 19 4 2倍。
Artificially controlled light illumination on five major broad-leaved seedlings (2 years) was tested in the mountains area of Liaoning,in order to study their physiological characteristics. The results showed that alls species have very feeble photosynthesis under lower light environment (relative illumination 10%),with maxmium net photosynthetic rate (P n) at 4～6 μmol CO 2·m -2·s -1.There was a little significant difference among species. The photosynthesis changes with the illumination and showed significant difference between species. The P n of Tilia amurensis, F.mandshurica, and F.rhynchophylla increase slowly while that of Pherodendron amurense and Quercus mongolica increase quickly. At the same time, the light complementation point (LCP) and dark expiration rate of T. amurensis, F. mandshurica, and F. rhynchophylla are lower respectively and can accumulate substances using lower light. The LCP of P. amurense and Q. mongolica, however, are higher and have great photosynthetic potential using facula under crown. The changes of light have an effect on accumulation of seedlings' dry biomass. The biomass of T. amurensis, F. mandshurica, and F. rhynchophylla under full light environment is 2.91～5.44 times higher than that under feeble light (RI 10%).Biomass of P. amurense and Q.mongolica under full light environment is 16.62～19.42 times higher than that under feeble light (10%).
出处
《生态学杂志》
CAS
CSCD
北大核心
2004年第5期106-110,共5页
Chinese Journal of Ecology
基金
国家自然科学基金项目 ( 3 0 2 70 2 5 0 )
中国科学院百人计划项目(KOTCE 0 3 9710 0 3 )资助。
关键词
天然次生林
阔叶树
生理特征
natural secondary forest, broad-leaved species, physiological characteristics.
