楠木古树健康评价模型的构建及应用  

Construction and Application of the Health Evaluation Model of Ancient Phoebe zhennan

作　　者：谭夏阳 薛彦斌 钟叶 丁博[3] 王茜[3] TAN Xiayang;XUE Yanbin;ZHONG Ye;DING Bo;WANG Qian(Shizhu Tujia Autonomous County State-Owned Forest Farm,Chongqing,409100,China;Chongqing Industry Polytechnic College,Chongqing,401120,China;School of Life Sciences,Southwest University,Chongqing,400715,China)

机构地区：[1]石柱土家族自治县国有林场,重庆409100 [2]重庆工业职业技术学院,重庆401120 [3]西南大学生命科学学院,重庆400715

出　　处：《林业与环境科学》2025年第2期51-59,共9页Forestry and Environmental Science

基　　金：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)。

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(0.0976)、顶梢枯死(0.0972)和叶密度(0.0960)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。To provide a scientific basis for the conservation of ancient Phoebe zhennan,this study investi-gated 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 ac-tual surveys and detection.(2)Among the evaluation indexes,lower branch dieback(0.0976),apical shoot dieback(0.0972),and leaf density(0.0960)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'individual trees was the highest(64.44%),followed by'general'(28.89%),and'poor and dying(or dying)'ac-counted for 6.66%in the model.It is necessary to carry out rescue protection.

关 键 词：楠木古树 健康评价模型 结构方程模型 古树保护 

分 类 号：S718.4[农业科学—林学]