【摘要】 以长春市林业科学研究院苗圃内培育的幼龄期北美香柏为研究对象,分析解析木生长数据,绘制生长曲线。结果表明:北美香柏18年时胸径、树高和材积的总生长量分别可达8.40 cm、5.55 m和0.018 0 m~3。12年时树高连年生长量达到峰值,为0.50 m, 15年时达到数量成熟龄。9年时胸径连年生长量达到峰值,为0.88 cm,大约17年时达到数量成熟龄。15年时材积连年生长量达到峰值,为0.002 5 m~3,18年时材积尚未达到数量成熟龄。更多还原

【Abstract】 The young Thuja occidentalis cultivated in the nursery of Changchun Academy of Forestry was taken as the object to draw the growth curve by the stem analysis. The results showed that the total increments of diameter at breast height(DBH), tree height and timber volume were 8.40 cm, 5.55 m and 0.018 0 m~3 respectively at the age of 18. The current annual increment of tree height reached the maximum at the age of 12 with 0.50 m. The age of quantitative maturity with tree height was 15. The current annual increment of DBH reached the maximum at the age of 9 with 0.88 cm. The age of quantitative maturity with DBH was about 17. The current annual increment of timber volume reached the maximum at the age of 15 with 0.002 5 m~3. The timber volume had not yet reached quantitative maturity at the age of 18.更多还原