Application of the pipe model theory to non-destructive estimation of leaf biomass and leaf area of pruned agroforestry trees
Application of the pipe model theory to non-destructive estimation of leaf biomass and leaf area of pruned agroforestry trees
复制标题
管道模型理论在农林修剪树木叶片生物量和叶面积无损估算中的应用
作者：
P. Nygren;S. Rebottaro;R. Chavarría
研究了三种农林树种Calliandra calothyrsus Maissn.、Erythrina berteroana Urban和Erythrina poeppigiana (Walpers) O.F.的枝条横截面积(CS)与叶片生物量(LM)和叶面积(LA)的关系。 Cook 开发了一种非破坏性方法来估计定期修剪的树木的 LM 和 LA。根据分叉水平观察到这些关系的变化，并且在刺桐属中，通过克隆观察到这些关系的变化。除 E 的小分支中的 CS-LM 关系外，所有关系都是线性的。 poeppigiana，最初是指数级的。在主枝水平上，CS与LM和LA的关系在所有情况下都是线性的，但回归参数值因物种和无性系而异，决定系数(R2)为0.88-0.99。结论是主分支CS与LM和LA的比值可以用于后者变量的无损估计。该方法的另一个好处是回归参数值反映了树内干物质的分配，因此可以指示其在不同农林业系统中的可能用途。
The relationship of branch cross sectional area (CS) to leaf biomass (LM) and leaf area (LA) was studied in three agroforestry tree species,Calliandra calothyrsus Maissn.,Erythrina berteroana Urban andErythrina poeppigiana (Walpers) O.F. Cook, to develop a non-destructive method for the estimation of LM and LA for trees managed with periodic pruning. Variation in these relationships was observed according to the bifurcation level and, in theErythrina spp., by clone. All the relationships were linear except the CS-LM relation in small branches ofE. poeppigiana, where it was initially exponential. At main branch level the relationship of CS to LM and LA was linear in all cases but the regression parameter values varied between species and clones, with determination coefficient (R2) 0.88–0.99. It was concluded that the ratio of main branch CS to LM and LA can be used for non-destructive estimation of the latter variables. The method has the additional benefit that the regression parameter value reflects the allocation of dry matter within a tree and, consequently, may give indications about its possible uses in different agroforestry systems.