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通过设置标准地,选择标准木,对日本扁柏、日本花柏和日本香柏等柏木树种生长过程进行研究。结果表明:(1)3个树种胸径在造林后3~4 a基本没有生长,日本扁柏、日本花柏胸径连年生长量曲线与平均生长量曲线相交于造林后8~9 a,日本香柏则是在造林后11~12 a,其连年生长量开始低于平均生长量,造林后8~15 a是胸径生长的旺盛期,应在造林10 a左右进行间伐。(2)树高生长量均在造林10 a内增长迅速,其旺盛生长期为造林后5~10 a,3个树种的连年生长量曲线和平均生长量曲线相交于造林后9~11 a。(3)材积连年生长量与平均生长量在早期生长缓慢,在造林0~20 a生长速度较为一致,而在造林20 a后,日本花柏材积连年生长量明显大于另外2个树种,解析木材积从小到大依次为日本扁柏(0.248 7 m3)、日本香柏(0.253 6 m3)、日本花柏(0.317 2m3)。(4)造林35 a后,3个树种林分均未到达成熟期,应对林分进行抚育管理等措施,达到培育柏木大径材的目的。
By setting the standard, select the standard wood, Japanese cypress, Japanese cypress and Japanese cedar and other cypress species growth process. The results showed that: (1) The DBH of three tree species basically did not grow 3-4 days after afforestation. The annual growth curve of DBH and Japanese DBH intersected with the average growth curve at 8-9 days after afforestation, After 11 ~ 12 years after afforestation, the annual growth began to be lower than the average growth rate. After 8 ~ 15 years after afforestation, it was the vigorous growth of DBH. Thinning should be carried out about 10 years after afforestation. (2) The growth of tree height increased rapidly within 10 years of afforestation, and its vigorous growth period was 5 to 10 years after afforestation. The annual growth curve and average growth curve of 3 tree species intersected 9-11 years after afforestation. (3) The annual growth volume and average growth volume of timber volume grew slowly at early stage, and the growth rates were similar between 0 and 20 years after afforestation. After 20 years of afforestation, the annual growth of Japanese currant was significantly greater than that of the other two species. The products were as follows: Japanese cypress (0.248 7 m3), Japanese cypress (0.253 6 m3) and Japanese cypress (0.317 2m3). (4) After 35 years of afforestation, the three tree species did not reach the maturity stage, and the forest management should be carried out to achieve the goal of cultivating the large-diameter wood of Kashiwagi.