摘要
基于树干解析资料,对重庆市永川区国有林场的桢楠(Phoebe zhennan)天然次生林进行了分析研究,结果表明,60年生桢楠木平均胸径38.81 cm,胸径年平均生长量在0.63~0.81 cm。60年生桢楠木平均树高为35.30 m,年均生长量在0.68 m。桢楠胸径和树高连年生长量在15~20年生长最快,分别为1.00cm和1.00 m,最小值均出现在55~60年,分别为0.31 cm和0.14 m。材积一直处于积累状态,60年生桢楠材积为1.713 1 m^3,年均生长量为0.017 4 m^3,连年生长量最大值出现在45年生时,为0.047 5 m^3。将桢楠胸径、树高、材积与树龄进行拟合,发现三次多项式有较好的拟合效果,拟合优度均达到99%,其回归方程分别为y=-5.275+1.203x-0.007x^2-0.000 006x^3、y=-5.109+1.087x-0.004x^2-0.000 06x^3、y=0.182-0.035x+0.002x^2-0.000 002x^3(y表示树高、胸径、材积,x表示树龄)。与速生树种杉木相比,38年生德昌杉木的树高、胸径总生长量分别为18.34 m、25.52 cm,桢楠的树高和胸径生长速度均大于杉木,加上桢楠木材价值高,可作为珍贵树种进行大面积栽培和推广应用。
Based on the material of stem analysis,Phoebe zhennan natural secondary forest of state forest farm in Yongchuan district of Chongqing city was analyzed.The results showed that,the mean DBH of 60-year Phoebe zhennan was 38.81 cm,mean annual DBH in⁃crement was between 0.63 cm and 0.81 cm.The mean height of 60-year Phoebe zhennan was 35.30 m,mean annual height increment was 0.68 m.The maximum of current annual DBH increment and height increment were 1.00 cm and 1.00 m,and they were occurred from 15 years to 20 years,the minimum of current annual DBH increment and height increment were occured in 55~60 years,they were 0.31 cm and 0.14 m,respectively.Until the 60th year,the growth of volume is in a state of continuous growth.The volume of 60-year Phoebe zhennan was reached 1.7131 m3,mean annual volume increment was 0.0174 m3.The maximum of current annual vol⁃ume increment occurred at 45-year-old and it was 0.0475 m3.The growth dynamic models of height,DBH and volume of Phoebe zhen⁃nan were established with the cubic polynomial,the goodness of fit all exceed 99%.Three regression equations were y=-5.275+1.203x-0.007x^2-0.000006x^3,y=-5.109+1.087x-0.004x^2-0.00006x^3,y=0.182-0.035x+0.002x^2-0.000002x3,where y is DBH,height and volume,x is age.Comparing with fast growing tree species Cunninghamia lanceolata,the height and DBH increment of 38-year Cunninghamia lanceolata were 18.34 m and 25.52 cm,the tree height and DBH growth rate of Phoebe zhennan were higher than that of Cunninghamia lanceolata,in addition to the high velue of Phoebe zhennan wood,it can be widely cultivated and applied as the pre⁃cious tree species in China.
作者
薛沛沛
陈本文
祝元春
钱涛
XUE Pei-pei;CHEN Ben-wen;ZHU Yuan-chun;QIAN Tao(Chongqing Academy of Forestry/Wulingshan Ecologial Forest Station of Chongqing,Chongqing 400036,China)
出处
《湖北农业科学》
2020年第24期128-132,共5页
Hubei Agricultural Sciences
基金
国家重点研发计划重点专项(2016YFD0600603)。
