早春类短命植物生物量研究(Ⅳ)——荷青花生物量及其模型构建

On Spring Ephemeral Plants Biomass(Ⅳ)——Biomass and Its Model Building of Hylomecon japonica

基于荷青花在药用、观赏以及森林生态系统养分循环等方面存在的价值,利用全株收获法采样,经分选、烘干、称重和数据统计后,获得了荷青花生物量及分配特征,并以其易测生长指标为自变量构建了总生物量的一元和多元线性回归方程.结果表明:荷青花群丛在营养生长停止期,各生长指标及生物量分配在个体间有较大差异,但平均丛高和根冠比变化较小;地下部分所支持的丛幅冠、丛株数和花果数等存在一定的供给限制,且这种限制与地下生物量间存在着显著或极显著的正相关关系.虽然荷青花生物量随各生长指标的变化存在不同程度的差异,但根冠比的变化差异均不显著,这在一定程度上印证了荷青花存在权衡有限光合资源分配的能力.荷青花生物量模型以多元线性回归的拟合结果较好,但考虑自变量过多带来的系统误差,生物量预估模型可选用以丛株数和花果数为自变量的拟合方程.

Based on the value of Hylomecon japonica in the medicine,ornamental and nutrient cycling of forest ecological system,the research obtained its biomass,distribution characteristics,and constructed the singleelement and multiple regression model for its total biomass with the growth indexes as the independent variable,by taking the whole plant harvest sampling method after sorting,drying,weighing and data statistics.The results showed that its growth indexes and biomass allocation varied remarkably from individuals,but its average height and root-shoot ratio changed smaller,when Hylomecon japonica association came to the withholding vegetative growth period.There was a certain supply constraint in crown width,the individual number and number of flowers and fruit of cluster supported by underground part,which had a significant positive correlation with the underground biomass.Although growth indexes of Hylomecon japonica were different with various degrees,but its root-shoot ratio difference was insignificant,confirming the Hylomecon japonica had the ability of resource allocation in weighing limited photosynthetic.It was relatively better to build the multiple linear regressions than singe-element regression; however,considering too many independent variables could cause some system errors,we selected a better fitting equation with individual number and number of flowers and fruit of cluster as independent variables.