Larrea tridentata地径、根系及枝相关关系的研究

为了研究Larrea tridentata根系生长情况,并建立相应的数学模型,对一年生和两年生Larrea进行了研究.结果表明:Larrea各器官之间的相关关系大多是极显著幂函数关系.两年生Larrea各器官之间的相关系数比一年生的相关系数有明显的增加.地径与主要根参数(总根长、根总断面积、根干重)和主要枝参数(侧枝总断面积、枝干重)之间都有极显著的幂函数相关关系.可见,用地径建立预测根系和侧枝参数的模型是可行的.地上部分生物量与地下部分生物量有极显著的幂函数相关关系,且随着地下部分生物量的增加,地上部分生物量成幂函数递增.侧枝总断面积与根总断面积之间呈极显著的线性关系.

A Study on Correlation between Diameter at Butt End,Root and Side Branch of Larrea tridentata

One year old and two years old seedlings of Larrea were used to study the growth of the roots of Larrea tri- dentata.The results are as follows:The relevant relations between Larrea every organ are significantly exponential functional relation.The correlation-coefficient has a obvious increase in two yeas old Larrea than one year old. There is significantly exponential functional relation between diameter at butt end and the main parameter of mot (the length of total roots,the total section area of roots,the dry weight of roots)and the main parameter of side branch(the total section area of side branch,the dry weight of branches).It is obvious that use the diameter at butt end to make the model to predict the parameter of root and side branch is feasible.There is significantly expo- nential functional relation between overground and underground biomass.And the growth of the overground biomass is exponential functional along with the growth of the underground biomass.The relevant relations between the total section area of roots and the total section area of branches are significantly prominent linearity.