土壤水分对鹅绒委陵菜表型可塑性的影响

Response of phenotypic plasticity of Potentilla anserine L. to soil moisture

研究了不同土壤水分条件对匍匐茎草本植物鹅绒委陵菜表型可塑性的影响,结果表明:间隔子、叶片数、分枝密度、分枝长度、分枝角度呈二次曲线变化;土壤含水量为田间最大持水量的64%左右的生境最为适宜;其复叶长对土壤含水量的反应可用YieldDensity曲线描述;其小叶间隔随着土壤水分的增加而增加,遵循Logistic曲线变化。克隆植物构型的可塑性有可能促进其对斑块性分布土壤水分资源的利用,因而具有一定的生态学意义。

The research was carried out to investigate the response of phenotypic plasticity of the prostrate herb Potentilla anserine L.to different soil moisture condition, i.e., 10%, 25%, 40%, 55%, 70%, 85%, 100% of field water capacity(FWC) on the soil of castanozem. The results showed that the spacer length, lamina number, branching intensity, branching length and branching angle of Potentilla anserine L. changed by quadratic curve; The optimum habitat for the plant was about 64% of FWC; The relationship between lamina length and soil moisture coincided to the yield density curve; The change of foliole space with soil moisture was simulated by logistic model. The architectural plasticity of clonal plants may enhance the exploitation of soil moisture resources, which have some ecological significance.