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采用3种密度试验研究了1年生梓树苗在不同株距条件下生物量、株高、地径的变化规律以及株高(H)与地径(D)的异速生长关系,并用线性回归和非线性回归的方法对数据进行了分析。结果表明:单株梓树幼苗各器官生物量均随着密度的增大而减小,各密度的根量均小于叶量,地上部占总生物量的60%以上;地上部分生物量随密度增加下降幅度的大小顺序为叶、茎生、根。在株距20cm时,其地径与株高之间的关系为简单异速生长关系,在log D-log H坐标图上为直线关系,株距10、5cm时地径与株高的关系符合二次多项式回归方程,即为非线性的异速生长。在log D-log H坐标图上为上凸曲线关系。
Three density experiments were conducted to study the changes of biomass, plant height and diameter of 1-year-old Catalpa bungei seedlings under different plant spacing and the allometric relationships between plant height (H) and ground diameter (D) The method of linear regression analyzed the data. The results showed that the biomass of each organ of Catalpa bungei seedlings decreased with the increase of density, the root biomass of all the densities was less than that of leaves, and aboveground biomass accounted for more than 60% of the total biomass. Aboveground biomass increased with the density Increase the magnitude of the decline in the order of leaves, stems and roots. The relationship between the ground diameter and plant height was simple allometric growth at a plant spacing of 20 cm and a linear relationship on the log D-log H plot. The relationship between the diameter and plant height at a plant spacing of 10,5 cm was in line with the quadratic Polynomial regression equation, that is, non-linear allometric growth. On the log D-log H plot for the convex curve.