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在都江堰市收集的杉木、柳杉、水杉地径测定样木共２３１９株，采用６个数学模型，分别研究了三树种树干基部三个不同部位直径（Ｄ０．００、Ｄ０．０５、Ｄ０．１０）与胸径（Ｄ１．３）的关系。研究结果表明：杉木、柳杉，水杉地径──胸径最佳相关方程分别为Ｄ１．３＝－０．１９７２２６２＋０．８６６４８６７Ｄ０．１０＋０．００００７０６Ｄ、Ｄ１．３＝－０．２８８０３６＋０．７８８７７２０Ｄ０．１０＋０．００２４９５４Ｄ．１０、Ｄ１．３＝－１．０７７２３２３＋０．８７１７２１４Ｄ０．１０；－０．０００３３００Ｄ．１０。并通过建立三树种胸径与材积相关方程，编制了都江堰市杉木、柳杉、水杉地径一元材积表。
A total of 2319 samples of Chinese fir, cedar, and Metasequoia were collected from Dujiangyan City. Six mathematical models were used to study the diameters of three different parts of tree trunks (D0.00, D0.05, D0.10 ) And breast diameter (D1.3). The results showed that the best correlation equation of diameters of Chinese fir, Cryptomeria fortunei and Metasequoia glyptostroboides was D1.3 = -0.1972262 + 0.8664867D0.10 + 0.0000706D, D1.3 = -0.288036 + 0.7887720D0.10 + 0.0024954D . 10, D1.3 = -1.0772323 + 0.8717214D0.10; -0.0003300D. 10. And through the establishment of three kinds of tree diameter and volume related equations, prepared Dujiangyan cedar, Cryptomeria fortunei Metasequoia diameter one-volume table.