无性系木麻黄人工林生长规律研究

利用项目研究中设置的系统抽样样地,选择不同径阶的无性系木麻黄标准木各3株作为解析木材料,测定木麻黄的生长规律研究。结果表明:木麻黄的胸径、树高生长快速期都出现在早期,均在12a生前达到最快生长;胸径的连年生长量与平均生长量曲线在第11~12a生时相交,树高的连年生长量与平均生长量曲线在11~12a生时相交;12a生以后胸径、树高生长均逐渐减弱。木麻黄材积的连年生长量在3~12a生一直呈现较快的增长趋势,12a生以后增长很慢,在15a生时达到最大值;而材积的平均生长量一直表现为平稳的增长趋势。

The growth law of Casuarina equisetifolia clone plantationplantation

The use of system samplingplotsis set in theproject study,choose a different size of 3 strains of casuarina equisetifolia clone standard wood as parsing wood material,determination of the growth of casuarina equisetifolia research. The results showed that, the fast growing phase of DBH and tree height appeared at the early stage, reached the fastest growth before the age of12 years. The annual increment curve of DBH intersected with the average increment curve of that at the age of 11~12 years. And the annual increment curve of tree height intersected with the average increment curve of that at the age of 11~12 years. The growth of DBH and height represented declining trend after the age of 12 years. The annual increment in timber volume showed the fast increasing tendency during 3 to 12 years old, while it increased slowly after the age of 12 years and reached the maximum at the age of 15 years. But the average increment of timber volume always showed the steady increasing tendency.