光皮树人工林生长规律研究

于湖南省洞口县大湾国有林场的光皮树生产基地设置临时标准样地,并选取优势木进行解析和测定,对光皮树的生长规律进行了研究。结果表明:光皮树的胸径、树高生长快速期都出现在早期,均在12年生前达到最快生长;胸径的连年生长量与平均生长量曲线在第12~15年生时相交,树高的连年生长量与平均生长量曲线在12~13年生时相交;12年生以后胸径、树高生长均逐渐减弱。光皮树材积的连年生长量在3~12年生一直呈现较快的增长趋势,12年生以后增长很慢,在15年生时达到最大值;而材积的平均生长量一直表现为平稳的增长趋势。树高曲线拟合以二次方程效果最好,其复决定系数为0.819。

The growth law of Cornus wilsoniana plantation

Through the stem analysis of dominance tree in the standard plots set up in Cornus wilsoniana production base of Dawan State-owned Forest Farm of Dongkou County,Hunan Province,the growth and development law of Cornus wilsoniana plantation was researched.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 of 12 years.The annual increment curve of DBH intersected with the average increment curve of that at the age of 12～15 years.And the annual increment curve of tree height intersected with the average increment curve of that at the age of 12～13 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.The results of height curve fitting indicated that quadratic equation gave the best result,of which the multiple determination coefficient was 0.819.