A reinterpretation of the gap fraction of tree crowns from the perspectives of computer graphics and porous media theory

文献类型： 外文期刊

第一作者： Zhu, Yunfeng

作者： Zhu, Yunfeng;Li, Dongni;Yun, Ting;Fan, Jiangchuan;Zhang, Huaiqing;Eichhorn, Markus P.;Eichhorn, Markus P.;Wang, Xiangjun;Yun, Ting

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关键词： volume-based gap fraction; porous media theory; fine geometric characterization; equivalent leaf thickness; computer graphics

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：5.6； 五年影响因子：6.8 ）

ISSN： 1664-462X

年卷期： 2023 年 14 卷

页码：

收录情况： SCI

摘要： The gap fraction (GF) of vegetative canopies is an important property related to the contained bulk of reproductive elements and woody facets within the tree crown volume. This work was developed from the perspectives of porous media theory and computer graphics techniques, considering the vegetative elements in the canopy as a solid matrix and treating the gaps between them as pores to guide volume-based GF(vol) calculations. Woody components and individual leaves were extracted from terrestrial laser scanning data. The concept of equivalent leaf thickness describing the degrees of leaf curling and drooping was proposed to construct hexagonal prisms properly enclosing the scanned points of each leaf, and cylinder models were adopted to fit each branch segment, enabling the calculation of the equivalent leaf and branch volumes within the crown. Finally, the volume-based GF(vol) of the tree crown following the definition of the void fraction in porous media theory was calculated as one minus the ratio of the total plant leaf and branch volume to the canopy volume. This approach was tested on five tree species and a forest plot with variable canopy architecture, yielding an estimated maximum volume-based GF(vol) of 0.985 for a small crepe myrtle and a minimal volume-based GF(vol) of 0.953 for a sakura tree. The 3D morphology of each compositional element in the tree canopy was geometrically defined and the canopy was considered a porous structure to conduct GF(vol) calculations based on multidisciplinary theory.

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