罗田垂枝杉单木生长规律及其生物量测定

以罗田垂枝杉人工林为对象,采用树干解析、枝解析和生物量测定等方法,在构建胸径、树高、材积、侧枝生长量、着枝角度生长模型及材积和生物量预估模型的基础上,分析罗田垂枝杉的生长过程和生物量变化规律。结果表明:罗田垂枝杉胸径和树高生长曲线呈“S”型,速生期分别为8~11 a和3~6 a,最大连年生长量分别为0.75 cm和0.75 m;材积生长曲线呈“J”型,12 a后进入速生期,25年生罗田垂枝杉材积生长量为0.1310 m 3,但并未达到最大值;侧枝基径和枝长分别在1年生和3年生的平均生长量最大,分别为0.95 cm和55.80 cm,随后逐年减缓,生长6 a后趋于停滞;在1年生侧枝着枝角度为65.9°,2~4 a逐年增加20°左右,5~6 a时基本保持不变,着枝角度最大值为130.9°;罗田垂枝杉的树干生物量和地上部分总生物量模型预估均有较好的效果,但枝、叶和树冠生物量的拟合优度较低,反映出罗田垂枝杉侧枝和叶生物量的特异性。

Growth Rhythm and Biomass Research of Cunninghamia lanceolata var.Luotian at Individual Tree Level

In order to discuss and analyze growth law and biomass change rule of Cunninghamia lanceolata var.Luotian,15 to 23-year forest plantations were studied using trunk and branch analyses and biomass determinations to construct growth models of DBH,height,volume,branch and branch angle and estimation equations of volume and biomass.The growth curve of DBH and height were both“S”and the fast-growing stage were 8 to 11 and 3 to 6 years,respectively,and the maximum current annual increment were 0.75 cm and 0.75 m,respectively.The growth curve of volume was“J”and the fast-growing stage was 12-year-old.The volume of 25-year-old achieved 0.1310 m 3 but not the maximum value.The average annual increment of diameter and length of branch were maximum in 1 and 3 years,and the growth value were 0.95 and 55.80 cm,respectively.Then the growth speed slowed down gradually until almost stopped in 6 years.Branch angle was 65.9°in 1 year and increased by year in 2-4 years,and then remained nearly unchanged in 5-6 years.The maximum reached to 130.9°.The fitness of the biomass forecast model of aboveground and trunk biomass were good,but the goodness of fit of branch and leaf biomass model were low.This result reflected the specificity of branch and leaf biomass of C.lanceolata var.Luotian.