| 摘要: |
| 为了给楠木 Phoebe zhennan 古树的保护提供指导依据, 文章利用抽样方法调查了重庆市大足
区、 潼南区、 酉阳县及武隆区集中分布的 90 株 100~500 a 的楠木古树, 并运用结构方程模型法 (Structural equation modeling, SEM) 构建楠木古树健康评价模型。 结果表明, (1) 通过构建理论模型、 模型假
设、 数据信度和效度检验、 模型适配度检验以及模型修正, 获得了适配度较高的评价模型, 可应用于实际
调查和检测。 (2) 在 14 项评价指标中, 下端枯枝 (0. 097 6)、 顶梢枯死 (0. 097 2) 和叶密度 (0. 096 0)
所占的权重较高, 是模型中反映楠木古树健康的关键指标。 (3) 使用修正后的评价模型对 90 株楠木古树
进行健康评价, 发现 “健康” 单株占比最高 (64. 44%), “一般” 次之 (28. 89%), “较差和濒死 (或死
亡) ” 在模型中占比 6. 66%, 需对其开展抢救性保护。 |
| 关键词: 楠木古树 健康评价模型 结构方程模型 古树保护 |
| DOI： |
| 分类号: |
| 基金项目:长江上游 (重庆段) 国家重点野生濒危植物保护研究 ( zlg2021-cq20211210), 桢楠良种繁育与高效培育技术推广示范 (渝林科推 2022 年 8 号)。 |
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| Construction and Application of the Health Evaluation Model of Ancient Phoebe zhennan |
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Tanxiayang1, xueyanbin2, Zhongye3, Dingbo3, Wangqian3
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1.Shizhuzu Tujia Autonomous County State-Owned Forest Farm;2.Chongqing Industry Polytechnic College;3.School of Life Science, Southwest University
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| Abstract: |
| To provide a scientific basis for the conservation of ancient Phoebe zhennan, this study investigated 90 ancient P. zhennan aged 100-500 years distributed in Dazu district, Tongnan district, Youyang county
and Wulong district of Chongqing Municipality, and constructed a model for assessing the health status of
ancient P. zhennan using structural equation modeling ( SEM). The results of the study showed that: ( 1)
Through the construction of theoretical models, model assumptions, data reliability and validity tests, model
fitness tests, and model refinement, a highly fitting evaluation model was obtained, which can be applied to actual surveys and detection. (2) Among the evaluation indexes, lower branch dieback (0. 097 6), apical shoot
dieback (0. 097 2), and leaf density (0. 096 0) exhibited the highest weights, among the evaluation indexes,
which were the key indexes to reflect the health of trees in the model. (3) The modified evaluation model was
used to evaluate the health status of 90 ancient P. zhennan. It was found that the proportion of ""healthy"" individu-al trees was the highest (64. 44%), followed by ""general"" (28. 89%), and ""poo |
| Key words: ancient Phoebe zhennan health evaluation model SEM protection of old trees |
