Functional evaluation of height-diameter relationships and tree development in an Australian subtropical rainforest
Functional evaluation of height-diameter relationships and tree development in an Australian subtropical rainforest
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DOI：
10.1071/bt21049
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发表时间：
2022-03-05
影响因子：
1.1
通讯作者：
Doley, David
中科院分区：
文献类型：
--
作者：
Howell, Steven R.;Song, Guo-Zhang Michael;Doley, David
上下文。描述树高(H)和胸高直径(D)之间关系的异速生长方程应该既具有统计效率，又具有生物学相关性。目标。确定所选异速生长方程是否符合效率和相关性的既定标准。方法。用9个方程对澳大利亚亚热带热带雨林1122个个体和18个种的H-D关系进行了比较。关键的结果。三参数渐近方程描述了初始斜率(a)、曲率(b)和渐近高度（H-a）。评估每个方程的精度（均方根误差，RMSE）和H估计偏差，以及函数参数的解释难易程度。对于单个物种和所有的茎，非矩形双曲线（NRH）提供了几乎同样高的精度和低偏差，与统计上最简洁的广义Michaelis-Menten函数一样，加上线性参数值容易与树的结构和功能属性相关。林冠种的NRH a值随木材密度的增加呈线性增加，林下种和亚优势种的NRH b值随H-a从林下到林冠种的增加而减小。结论。林下结构类群、亚优势结构类群和冠层结构类群中的物种在类群内具有相似的参数值范围，反映了内在的建筑和发育模式以及对H-a的环境限制。
Context. Allometric equations describing the relationships between tree height (H) and breast height diameter (D) should be both statistically efficient and biologically relevant. Aims. To determine whether selected allometric equations can meet established criteria for both efficiency and relevance. Methods. Nine equations were compared to define the H-D relationships of 1122 individuals and 18 species from an Australian subtropical rainforest. Key results. Three-parameter asymptotic equations described initial slope (a), curvature (b), and asymptotic height (H-a). Each equation was evaluated for precision (root mean square error, RMSE) and bias in H estimates, and ease of interpretation of function parameters. For both individual species and all stems, a non-rectangular hyperbola (NRH) provided almost equally high precision and low bias as did the statistically most parsimonious generalised Michaelis-Menten function, plus linear parameter values easily relatable to tree structural and functional attributes. The value of NRH a increased linearly with wood density for canopy species, but not for understorey and subdominant species, whereas the value of NRH b decreased as H-a increased from understorey to canopy species. Conclusions. Species within understorey, subdominant, and canopy structural groups shared similar ranges of parameter values within groups that reflect both intrinsic architectural and developmental patterns, and environmental limitations to H-a.