Larrea tridentata根系形态及其与地上部分相关关系的研究

通过整株法,观测1 a生与2 a生Larreatridentata根系的生长分布状况,并通过地径建立根系生长状况的数学模型。结果表明:L.tridentata根系庞大,主根长,侧根发达,根型利于对水分的吸收,具有典型沙漠植物的根系特征;地径与主要根参数(总根长、根总断面积、根干重)有极显著的指数函数相关关系,可用地径建立预测根系生长的模型。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。

Root morphology and correlation between root growth and shoot growth of Larrea tridentata

To study the root growth and find the model of root growth in Larrea tridentata,we follow the distribution of roots on one-year-and two-year-old L.tridentata.The results indicate that L.tridentata has a huge root system with long taproots and developed branch roots.The type of such roots makes for the absorption of water.The root system of L.tridentata has the characteristic of typical desert plants.There is a significant exponential functional relation between diameter at butt end and the main parameters of root(the length of total roots,the total section area of roots,and the dry weight of roots).The diameter at butt end might be used to devlop model for predicting the parameter of root.There is a significant exponential functional relation between overground and underground biomass.And the overground biomass grows exponentially with the growth of the underground biomass.