FracRoot模型在橡胶树根系研究上的应用初探

以30年生的3个品种的橡胶树为参试材料建立根系模型。测量根系拓扑、分枝规律、连结长度、连结直径和根系分枝角度，将这些数据应用于FracRoot模型，对橡胶树根系分段数量、总长度和生物量进行预测。结果表明，根段的逐渐变细对参数α值有很大影响，FracRoot模型轻微的低估了RRIM600和PR107中根系的分段数量和总长度，高估了GT1分段数量和总长度；过高的估计了所有物种的单一根系总的生物量；过低预测根系的水平分布，而过高的估计了垂直分布。

Application of the FracRoot Model in the Root Study of Rubber Tree Species

30-year old rubber trees of three varieties were selected as the study material to establish the root model of rubber trees.The root topology,branching rules,link length and diameter and root orientation were measured,and then these data were analyzed with FracRoot model to predict the number of segments,total length and biomass.The results showed that root segments tapering had a strong impact on the value of parameter α in FracRoot model.The established FracRoot model slightly underestimated the segment number and total length in RRIM600 and PR107,whereas modestly overestimated these variables in GT1;The total biomass of single root was overestimated in all three studied varieties;the horizontal extension of root system tends to be underestimated,whereas the vertical extension was overestimated.