克隆植物蝴蝶花在光梯度环境上的形态适应性研究

对四川缙云山毛竹林和针阔叶混交林具有林窗、林缘和林下3种光照差异明显生境下的克隆草本植物蝴蝶花的形态可塑性进行了研究．统计了分株、根茎和叶生长方向等特征．经方差分析和t检验后表明．蝴蝶花在光梯度环境下，其形态特征表现出适应性变化．从林窗→林绿→林下，随着光强度的减弱，分株的高度、密度相应减小．在林下达到最小；而根茎的长度、节间长则相反，在遮荫大的林下最大．研究发现，叶片数目和根茎直径在不同的样地和生境中无明显变化，但叶片的生长方向和光照方向关系极大，表现出极强的向光性．此外，文章还对蝴蝶花表现出的可塑性进行了分析和讨论．

Morphological adaptability of clonal herb Iris japonica to changed light condition

The morphological response of clonal herb Iris japonica to different light conditions was studiedin the gap. edge and understory within both bamboo forest and mixed needle-broadleaved forestin Mt. Jinyun of Sichuan. Statistic analyses indicate that the plant showed an adaptive changein morphology under different light habitats. From gap to edge and to understory, the heightand density of ramets were reduced with decreasing light intensity, and while the opposite wastrue for the length of rhizomes and internedes. The number of leaves and the diameter of rhizomes had no significant difference in different plots and habitats, but the direction of leaveswas strongly related to the direction of sun-light. showing a strong phototaxis. In addition, theplasticity of Iris japonica was analyzed and discussed in this paper.