【摘要】 对苏北东海丘陵岗地引种的中山杉302优良无性系生长规律研究结果表明:中山杉302在该丘陵岗地立地上生长具有较强的适应性,13年生时平均树高达8 m,平均胸径15.7 cm,其生长量显著超过在相同立地上栽植的水杉、池杉、落羽杉和火炬松。与省内其他造林立地上的中山杉302相比,丘岗立地的生长潜力与季节性淹水的长江滩地沙土立地相近,但低于苏北平原沙质碱性土和沙质潮盐土立地。中山杉302造林初期树高生长相对较缓慢,4 a后加快,14 a时树高连年生长量仍保持增长趋势;胸径连年生长在10 a左右达到峰值,10 a后有所下降,但仍保持较高的年生长量;材积连年生长量和平均生长量均随树龄增加呈持续增长趋势,14 a时,仍维持较快的增长速度。R ichards曲线对中山杉302树高、胸径和材积生长动态有较好的拟合效果。更多还原

【Abstract】 Taxodium ’Zhongshansha 302’(Taxodium distichum × T.mucronatum)was planted in hilly area,Donghai,northern Jiangsu,in 1993.Trial plantation measure and stem analysis showed that the growth of Taxodium ’Zhongshansha 302’ had the strong adaptability.The average height of 13-year-old tree reached 8 m,with average dbh 15.7 cm.Its growth rate remarkably surpassed Metaseqoia glyptostroboides,Taxodium ascendens,T.distichum,and pinus taeda on the same site.The growth potential was the same as on plantation site of beach sandy soil with short-term flood in the lower reaches of Yangtze River,and lower than that on the site of natural alkaline sand soil and the slight salinity sand soil in northern Jiangsu plain.The initial stage height growth of T.’Zhongshansha 302’ was slow,after 4th year the annual growth sped up,still maintained the growth tendency till the 14th year.The annual DBH growth achieved the peak in about 10th year,afterwards dropped,but still maintained bigger annual growth.The annual volume growth and average growth continued increasing with the tree age,and still maintained the quick rate in 14th year.The growth dynamic models of height,DBH and volume of Taxodium ’Zhongshansha 302’ were established with the Richards Equation.更多还原