匍匐茎草本蛇莓克隆构型对不同海拔的可塑性反应

Architectural plasticity of the stoloniferous herb, Duchesnea indica in response to different elevation

克隆植物构型的可塑性可使它在不同海拔的环境中通过克隆生长,调整其对不同海拔的资源获取对策,因而具有重要的生态学意义.在一海拔高度实验中,匍匐茎草本蛇莓(Duchesneaindica)经历了不同海拔(400、800、1200和1600m)处理,以研究不同海拔对蛇莓克隆构型的影响.结果表明,随着海拔的增加,间隔子长度、分株密度、分枝角度和分枝强度呈二次曲线变化.在不同海拔生境中,蛇莓克隆构型相关特征的可塑性变化可用动态Logistic模型进行模拟和预测,拟合效果较好.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 of clonal plant may modify its ways of utilization of resources through clonal growth and be of ecologically importance. The plasticity of clonal architecture in response to ecological conditions at different altitudes in a stoloniferous herb, Duchesnea indica, was investigated in an experiment with different elevations of 400, 800, 1200, and 1600 m. The results showed that the change patterns of spacer length, ramet density, branching intensity, and branching angle of Duchesnea indica were in a quadratic curve when the elevation increased. The architectural plasticity of D. indica was simulated through dynamic Logistic model, and the imitative effect was statistically preferable. Combining with the resources utilization of Duchesnea indica under different environments, the architectural plasticity was also discussed in this paper.