西藏核桃古树分布格局及树龄研究  

Study on Distribution Pattern and Tree Age of Ancient Juglans regia in Tibet Autonomous Region

作　　者：袁寒嫣 程名 潘刚 YUAN Hanyan;CHENG Ming;PAN Gang(Research lnstitute of Tibet Plateau Ecology,Tibet Agricultural&Animal Husbandry University;Tibet Key Laboratory of Forest Ecology in Plateau Area,Ministry of Education;United Key Laboratories of Ecological Security,Tibet Autonomous Region;National Key Station of Field Scientific Observation&Experiment,Nyingchi Tibet,860000,China)

机构地区：[1]西藏农牧学院高原生态研究所 [2]西藏高原森林生态教育部重点实验室 [3]西藏生态安全联合重点实验室 [4]西藏林芝高山森林生态系统国家野外科学观测研究站,西藏林芝860000

出　　处：《高原农业》2023年第3期264-272,共9页Journal of Plateau Agriculture

基　　金：西藏生态安全联合重点实验室开放基金项目(STAQ-2021Y-5);社会服务项目(日喀则拉孜县古树名木调查)。

摘　　要：根据现有的西藏核桃古树资源调查资料,对西藏自治区核桃古树分布格局及树龄进入深入研究,为西藏自治区核桃古树资源保护与制定保护策略及开发提供借鉴和指导作用。本研究运用网格法,通过分别计算扩散系数、负二项参数、Cassie指数、丛生指数以及聚块性指标分析西藏自治区核桃古树的分布格局,同时对西藏全区的核桃古树胸围与树龄的回归模型y=517.59ln(x)-2681.8(R^(2)=0.7605)进行模型验证。西藏自治区核桃古树呈聚集分布。当胸围在380~750 cm时,模型验证效果最为可靠。回归模型y=517.59ln(x)-2681.8(R^(2)=0.7605)是能较准确地适用于全区范围内胸围在380~750 cm核桃古树估龄的。According to the existing survey data of ancient Juglans regia resources in Tibet,the distribution pattern and tree age of ancient J.regia in Tibet Autonomous Region have been deeply studied,which can provide reference and guidance for the protection and the formulation of protection strategies and development for ancient J.regia resources in Tibet Autonomous Region.In this study,the grid method was used to analyze the distribution pattern of ancient J.regia in Tibet Autonomous Region by respectively calculating various indices,such as the diffusion coefficient,negative binomial parameter,Cassie index,clumping index and clustering index.At the same time,the regression model y=517.59ln(x)-2681.8(R^(2)=0.7605)of the breast circumference and age of ancient J.regia in Tibet was verified.The ancient J.regia in Tibet Autonomous Region were clustered,and the model verification effect was the most reliable when the breast circumference ranged from 380 to 750 cm.The regression model y=517.59ln(x)-2681.8(R^(2)=0.7605)can be more accurately applied to estimate the age of ancient J.regia with breast circumference at 380~750cm in the whole area.

关 键 词：核桃 西藏 分布格局 树龄 

分 类 号：S812-05[农业科学—草业科学]