杉木与峦大杉人工混交林杉木生长规律研究

Study on Growth Rule of Cunninghamia lanceolata in Mixed Plantation of C.lanceolata with C.konishii

用来舟林业试验场24年生杉木与峦大杉人工混交林试验样地数据,以及杉木树干解析资料,研究其生长规律,结果表明:树高连年生长量在8年生时达到最大,为1.00m/a;树高平均生长量在幼林时期较大,在2年生和4年生时分别是1.75、1.20 m/a,4年生之后随着年龄增长呈现出逐年平稳降低趋势。胸径连年生长量波动较大,前后出现3次生长高峰,分别是在4年生、16年生和22年生,其连年生长量分别达到0.74、1.27cm/a和0.70 cm/a;胸径平均生长量变化平缓,2次出现高峰值分别在18年生、22年生,其值均为0.61 cm/a。材积连年生长量最大值出现在20年生,为0.003 16 m3/a,22年生时材积平均生长量达到最大值,为0.001 03 m3/a;材积平均生长量与连年生长量在接近24年生时相交,表明此时的树龄为杉木的数量成熟龄。利用Mat Lab软件,拟合了杉木人工林的树高、胸径和单株材积的Richards方程,拟合效果好、精度高,拟合的数学模型可作为杉木人工林科学经营的理论依据。

The growth rule of 24-year-old Cunninghamia lanceolata plantation on Laizhou National Forestry Ex- perimental Farm was studied with stem analysis and relevant data collected from the sample plots of C. lanceolata mixed with C. konishii. The results indicated that the largest current annual height growth rate of C. Lanceolata oc- curred in the 8th year, which was 1. 00 m/a. The mean annual height growth rate on the 2na year and 4th year was 1.75 m and 1.20 m individually, and this index dropped steadily after the 4th year. The current annual DBH growth rate of C. Lanceolata fluctuated along the time, and there were 3 peaks as 0. 74 cm/a, 1.27 cm/a and 0.70 cm/a taking place respectively in the 4th, 16th and 22nd year. The mean annual DBH growth rate changed less, there were 2 peaks with the same value as 0.61 cm/a individually in the 18th year and 22nd year. The largest current and mean annual volume growth rate happened separately in the 20th and 22nd year as 0. 003 16 m3/a and 0. 001 03 m3/a. The current and mean annual volume growth rate intersected in the 24th year which indicated that C. lanceolata reached quantitative mature age by this time. The Richards growth equations with high precision weredeveloped for the tree height, DBH and ware. These equations might provide the individual tree volume of C. Lanceolata scientific tending and management of C. plantation by using Mat Lab soft- Lanceolata plantations with theo-retical foundation.