谷子生物量与器官几何特征间的异速驱动关系研究

Study on allometric driving relationship between biomass and organs geometric characteristics of millet

以谷子(Setaria italica)品种张杂10号为试验材料,通过大田谷子生长栽培试验,动态测定了张杂谷子不同叶位的叶片长度(最大长度)、叶片宽度(最大宽度)、叶片生物量、茎节长度(最大长度)、茎节生物量以及谷穗长度和谷穗生物量,分析了不同器官生物量与其几何形态结构特征参数的异速变化关系,构建了基于生物量的谷子器官几何形态结构生长模型。结果表明,叶片生物量与叶片长度、茎节生物量与茎节长度、谷穗生物量与谷穗长度的异速变化关系采用幂指数方程表示,方程的决定系数分别为0.83、0.77和0.98,叶片生物量与叶片宽度呈二次曲线变化,决定系数为0.80,各方程显著性检验结果均显示达极显著水平(P<0.01);叶片长度、叶片宽度的实测值与模型模拟值的均方根误差分别为5.28 cm和0.35 cm,茎节长度的实测值与模型模拟值的均方根误差为1.17 cm,谷穗长度的实测值与模型模拟值的均方根误差为2.40 cm。谷子不同器官的几何形态结构参数与其对应的累积生物量之间存在显著的统计相关性,采用构建的生物量预测谷子器官几何结构模型具有较高的精度。

Taking hybrid millet(Setaria italica)Zhangza No.10 as experiment material,the leaf length(maximum length),leaf width(maximum width),leaf biomass,stem node length(maximum length),stem node biomass,spike length and spike biomass of different leaf position of Zhangza millet were dynamically measured through field cultivation experiment.The allometric relationship between the biomass of different organs and their geometric morphological structure characteristic parameters were analyzed,and the geometric morphological structure model of millet organs based on biomass was constructed.The results showed that the allometric relationship between leaf biomass and leaf length,stem node biomass and stem node length,and spike biomass and spike length was expressed by the power exponential equation,and the determination coefficients of the equations were 0.83,0.77 and 0.98,respectively.The leaf biomass and leaf width showed a quadratic curve,and the determination coefficient was 0.80.The significant test results of equations all showed extremely significant level(P<0.01).The root mean square errors between the measured and simulated values of leaf length,and leaf width were 5.28 cm and 0.35 cm,respectively.The root mean square error between the measured and simulated values of stem node length was 1.17 cm.The root mean square error between the measured and simulated values of spike length was 2.40 cm.There was a significant statistical correlation between the geometric structure parameters of different organs in millet and their corresponding cumulative biomass,and the prediction of the geometric structure model of millet organs based on biomass had high accuracy.