蓬溪县乔木型香椿人工林生长特性研究

Reseach on the Growth Characters of Toona sinensis Plantation in Pengxi County

采用树干解析法对蓬溪县香椿人工林生长规律进行研究。结果表明:27 a生香椿的胸径、树高与材积总生长量分别为38.2 cm、22.3 m与0.9874 m3;其年平均生长量分别为1.41 cm、0.83 m与0.03624 m3;材积连年生长量在第15a时达到最大值,年平均生长量在第24 a时达到最大值,两者在第26 a时相交,香椿材积数量成熟龄为26 a;香椿的胸高形数在第15 a左右基本稳定在0.4;logistic曲线对香椿胸径、树高、材积生长动态有较好的拟合效果,其回归方程分别是y=40.1890/(1+5.4884×e-0.1719x),y=22.2083/(1+7.3383×e-0.2352x),y=1.0785/(1+27.0171×e-0.2010x),其拟合相关系数分别为0.9782、0.9722、0.9975。

The research was conducted on the growth characteristics of the Toona sinensis plantation in Pengxi county in Sichuan province by using the stem analysis method. The results showed that the DBH,tree height and tree volume growth of the 27-year-old Toona sinensis plantation were 38. 2 cm,22. 3 m and 0. 9874 m^3,respectively. Their mean annual increment were 1. 41 cm,0. 83 m and 0. 03624 m^3. The current annual increment and mean annual increment of timber volume reached maximumat at the age of15 and 24,and they intersected at the age of about 26,which meant that the Toona sinensis growth process had reached its quantitative maturity at the age of 26. The tree form was basically steady at the age of about 15. The growth dynamic models of DBH,height and volume of Toona sinensis were established with the Logistic Equation. Three regression equations were： y = 40. 1890 /（ 1 ＋ 5. 4884 × e^- 0. 1719x）,y = 22. 2083 /（ 1 ＋ 7. 3383 × e^- 0. 2352x） and y = 1. 0785 /（ 1 ＋ 27. 0171 × e^- 0. 2010x）,and the correlation coefficients of fitting curve（ R^2） were 0. 9782,0. 9722 and 0. 9975.