摘要
以广西壮族自治区国有三门江林场11 a生的西南桦桂中地区引种造林试验林为试材,通过样地调查和标准木树干解析探讨西南桦人工林的生长规律。结果表明:西南桦树高平均生长量5 a达到最大值1.98 m·a^-1,连年生长量4 a达到最大值3.02 m·a^-1,树高的快速生长时期是造林后5 a内;胸径平均生长在幼林期间增速较快,6 a达到最大值1.56 cm·a^-1,随后呈现逐年降低趋势,连年生长量有波动且明显,前后出现2次生长高峰,分别是在3 a和6 a,连年生长量分别达到2.30 cm·a^-1和1.90 cm·a^-1;单株材积平均生长变化平缓,呈现逐年增加趋势,11 a平均生长量达到0.014 44 m3·a^-1,连年生长量达到0.027 57 m3·a^-1,材积连年生长量与平均生长量均未出现最大峰值和尚未有相交的迹象,说明西南桦人工林还没达到数量成熟。
Using the introduction experimental forest of Betuia alnoides in central Guangxi,which is 11 years in Sanmenjiang Forest Farm of Guangxi Zhuang Autonomous Regio,as test materials,we studied the growth rule of Betuia alnoides plantation through sample plot investigation and analysis of standard wood trunk. The results showed that the average height of birch in Betuia alnoides reached a maximum of 1.98 m · a^-1 for 5 years and a maximum of 3.02 m · a^-1 for 4 years. The rapid growth period of tree height was within 5 years after afforestation. The average DBH increased rapidly during the seedling period,reaching a maximum value of 1.56 cm · a^-1 in 6 years,followed by a decreasing trend year by year. The annual growth fluctuated significantly,and there were two growth peaks before and after 3 years and 6 years,respectively. The annual growth reached 2.30 cm · a^-1 and 1.90 cm · a^-1. The average growth change of individual plant volume was gentle,showing a trend of increasing year by year. The average growth amount of 11 years reached 0.014 44 m3 ·a^-1,and the continuous growth amount reached 0.027 57 m3 ·a^-1. The continuous growth amount of volume and the average growth amount showed no peak and no sign of intersection,indicating that the artificial forest of Betuia alnoides had not reached the quantity maturity.
作者
覃雯霞
吴伟平
彭福燕
陈元松
彭健
韩胜
易敬林
Qin Wenxia;Wu Weiping;Peng Fuyan;Chen Yuansong;Peng Jian;Han Sheng(Sanmenjing Forest Farm of Guanxi zhuang Autonomous Regio,Liuzhou 545006)
出处
《湖北林业科技》
2019年第6期23-26,30,共5页
Hubei Forestry Science and Technology
关键词
西南桦
树干解析
生长规律
生长量
Betuia alnoides
stem analysis
growth regularty
growth
