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首页> 外文期刊>Journal of Forest Planning >Allometric Equations for Estimating Root Systems of Mizunara Oak (Quercus crispula) in Secondary Forests
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Allometric Equations for Estimating Root Systems of Mizunara Oak (Quercus crispula) in Secondary Forests

机译：估算次生林中水栎（Quercus crispula）根系的异速方程。

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摘要

Root biomass can represent a significant proportion of the total ecosystem biomass, although the difficulty in extracting the roots is often a limiting factor when estimating the beiowground biomass. The objective of this study is to create equationsto estimate the root variables from other tree variables for mizunara oak (Quercus crispuia BLUME) in broad-leaved secondary forests. First, experimental plots were established in secondary forests dominated by mizunara oak and sample oak trees were felled just outside the plots. The biomass of each tree organ was measured and other root variables such as root length, area and volume were also measured. Then, allocation of the four root variables by root diameter classes was described. Regression equations by power function were created between the four root variables and root diameter to estimate the missing root parts by root diameter classes and for the total root system. Root variables for missing parts were estimated from the diameter of broken root ends with regression equations between the four root variables and root diameter for total root system. Finally, allometric regressions between root variables and other tree variables were analyzed both by root diameter classes and for the total rootsystem. Diameter at beast height (DBH) proved to be a good predictor of root variables for different root classes and for the total root system. Diameter at stump height (DSH) can be a useful estimator If branching starts at DBH as it also shows high correlation with root systems.
机译：根生物量可占生态系统总生物量的很大一部分，尽管在估算低地生物量时提取根的困难通常是一个限制因素。这项研究的目的是建立方程式，以便从阔叶次生林中的Mizunara橡树（Quercus crispuia BLUME）的其他树木变量中估算出根变量。首先，在以米苏纳拉（Mizunara）橡树为主的次生森林中建立了试验地块，并在该地块的外围砍伐了样本橡树。测量了每个树木器官的生物量，还测量了其他根变量，例如根长，面积和体积。然后，描述了通过根直径类别分配四个根变量。在四个根变量和根直径之间创建基于幂函数的回归方程，以按根直径类别和整个根系统估算缺失的根部分。根部折断的直径可通过四个根变量与根系总根系之间的回归方程，根据缺失根端的直径估算出缺失部分的根系变量。最后，通过根直径类别和整个根系统分析了根变量与其他树变量之间的异速回归。事实证明，野兽高度直径（DBH）可以很好地预测不同根类和整个根系的根变量。如果分支开始于DBH，则树桩高度的直径（DSH）可能是有用的估计值，因为它也显示出与根系统的高度相关性。

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