A Carbon Balance Model of Growth and Self-Pruning in Trees Based on Structural Relationships

修剪 平衡(能力) 碳纤维 增长模型 碳储量 数学 林业 植物 生物 生态学 地理 算法 气候变化 复合数 数理经济学 神经科学
作者
Annikki Mäkelä
出处
期刊:Forest Science [Oxford University Press]
卷期号:43 (1): 7-24 被引量:200
标识
DOI:10.1093/forestscience/43.1.7
摘要

Abstract A tree growth model is formulated based on structural relationships in a carbon balance framework. Three relationships are applied: (1) an allometric relationship between crown surface area and foliage area, (2) the principle of functional balance, and (3) the pipe-model theory. These assumptions lead to a model where the sizes of the functional parts of the tree are derivable from foliage weight, except for the pruning height of the crown. This is determined by defining a "self-pruning coefficient," which controls the allocation of growth between height growth and foliage growth. The tree model is applied to an average-tree based stand growth model where both the self-pruning coefficient and tree mortality are made functions of crown coverage. The model is quantified for Scots pine growing in southern Fenno-Scandia. The overall behavior of the model is realistic. The model responds to stocking density through the rate of self-pruning, lower stocking densities leading to larger crown ratios. It also responds to changes in parameters describing site quality in a realistic way, although the differences in stand density are not as large as expected. The predicted development of the biomass compartments in individual trees agrees well with data on dominant Scots pine trees in Finland. For. Sci. 43(1):7-24.

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