摘要
Architectural plasticity of clonal plants may enhance exploitation of soil moisture heterogeneity by the plants. The plasticity of clonal architecture in response to soil moisture in the stoloniferous herb, Duchesnea indica Focke, was investigated in an experiment with different soil moisture contents as treatments, i.e. 40%, 60%, 80%, 100% of the maximum moisture content of soil (MMCS). As soil moisture content increased, the spacer length, ramet density, branching intensity and branching angle of D. indica plants changed by quadratic curve. And the optimum habitat for the plants was at 80% of the MMCS. This architectural plasticity in D. indica was simulated through the Dynamic Logistic Model. The imitative effect was statistically satisfactory. Its architectural plasticity observed here may allow the species to show foraging behavior in its habitat where soil moisture is patchily distributed.
克隆植物构型的可塑性有可能促进它对斑块性分布土壤水分资源的利用 ,因而可能具有生态学意义。在田间实验中 ,匍匐茎草本蛇莓 (DuchesneaindicaFocke)经历了不同土壤水分水平 (土壤最大含水量的 40 %、6 0 %、80 %、10 0 %等 )处理 ,以研究土壤水分对蛇莓克隆构型的影响。结果表明 :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 ,土壤含水为最大含水量的 80 %的生境为最适。在不同土壤水分水平生境中 ,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 。
基金
国家重点基础研究发展规划项目 (G2 0 0 0 0 46 80 4)
国家杰出青年科学基金 ( 3982 5 10 6 )~~
