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本文以生长在３种长江滩地类型（江滩、洲滩、湖滩）、３种栽植密度（３ｍ×４ｍ、４ｍ×５ｍ、５ｍ×６ｍ）下的３个品系速生人工林杨树木材［欧美杨无性系７２杨（Ｐｏｐｕｌｕｓ×ｅｕｒａｍｅｒｉｃａｎａｃｖ．Ⅰ７２／５８），美洲黑杨无性系６３杨（Ｐ．ｄｅｌｔｏｉｄｅｓｃｖ．Ⅰ６３／５１）和６９杨（Ｐ．ｄｅｌｔｏｉｄｅｓｃｖ．Ⅰ６９／５５）］为对象，首次分别建立了长江滩地速生杨树纤维长度（ＦＬ），微纤丝角（ＦＡ）和木材密度（ＷＤ）随生长因子中的生长轮年龄（ＣＡ）和年轮宽度（ＲＷ）变化的模型，即：ＦＬ＝７６５．０７＋１１９．７７ＣＡ－６．１５ＣＡ２－１５０６．９７（１／ＲＷ）＋３６５．１８（ＣＡ／ＲＷ）－１８．０２（ＣＡ２／ＲＷ）ＦＡ＝９．６４３＋０．０６１ＲＷ＋２．３７６（１／ＣＡ）－０．２０１（ＲＷ／ＣＡ）ＷＤ＝０．４４７－０．００３ＣＡ＋０．００４（１／ＲＷ）＋０．００４（ＣＡ／ＲＷ）从检验结果来看，纤维长度随生长轮年龄和生长速度变化的模型能够较好地预测长江滩地人工林杨树不同单株纤维长度的变化（ｒ＝０９８９），而微纤丝角和木材密度随生长轮年龄和生长速度变化的模型对长江滩地人工林杨树株内微纤丝角和木材密度能够?
In this paper, three species of fast-growing plantation poplar woods grown in three types of Yangtze River beach land (river beach, beach, beach), three planting density (3m × 4m, 4m × 5m, 5m × 6m) Populus × euramericanacv.Ⅰ72 / 58, P.deltoidescv.Ⅰ63 / 51 and P.deltoidescv.Ⅰ69 / 55, As the object, the changes of the growth wheel age (CA) and annual ring width (RW) of growth factors were firstly established for the poplar fiber length (FL), microfibril angle (FA) and wood density (WD) FL = 765.07 + 119.77CA-6.15CA2-1506.97 (1 / RW) +365.18 (CA / RW) -18.02 (CA2 / RW) FA = 9.643 + 0.061RW + 2. 76 (1 / CA) -0.201 (RW / CA) WD = 0.447-0.003CA + 0.004 (1 / RW) +0.004 (CA / RW) From the test results, The change of age and growth rate could predict the change of the length of different single plant fiber in the poplar plantation in the beach of Changjiang River (r = 0989), while the change of the microfibril angle and wood density with the growth wheel age and growth rate The model can be used to estimate the microfibril angle and wood density in poplar plantations in the Yangtze River beach.