蛇莓克隆构型对光照强度的可塑性反应

ARCHITECTURAL PLASTICITY IN RESPONSE TO LIGHT INTENSITY IN THE STOLONIFEROUS HERB, DUCHESNEA INDICA FOCKE

克隆植物构型的可塑性反应可能是它在资源斑块性分布的环境中获取资源对策的重要方面 ,因而可能具有重要的生态学意义。在一田间实验中 ,匍匐茎草本蛇莓 (Duchesnea indica Focke)经历了不同相对光照强度的处理 ,以研究光照强度对蛇莓克隆构型的影响。结果表明 :随着相对光照强度的增加 ,间隔子的长度逐渐降低 ,分枝角度、分枝强度和分株密度呈二次曲线变化。结合植物对环境异质性的利用对策 ,对所揭示的蛇莓克隆构型可塑性进行了讨论。

Architectural plasticity may allow clonal plants to exploit resource heterogeneity efficiently. The plasticity of clonal architecture in response to light intensity in the stoloniferous herb, Duchesnea indica Focke, was investigated in a growth experiment with four levels of light intensity. Spacer length decreased and branching angle,branching intensity and ramet density varied quadratically with increasing light intensity. This architectural plasticity was simulated with a Dynamic Logistic Model, the imitative effect of which was statistically satisfactory. The architectural plasticity described here may permit foraging for light in D. indica and may confer an advantage in its habitat where light intensity is patchily distributed.