【摘要】 以东门林场13年生尾巨桉(Eucalyptus urophylla×E.grandis)为研究对象,研究尾巨桉无性系6种不同造林密度人工林的生长过程。结果表明,尾巨桉6种密度处理间,林龄6年生前树高差异较小,6年生后差异开始显著,林分密度越大,高生长越小。各密度处理胸径生长在各生长阶段差异都达到极显著水平,胸径随密度增大而减小,且差异随年龄的增加而增大,各密度处理胸径生长高峰期主要集中在前3年,2年时各密度处理胸径平均生长量达到或超过3.5cm。各密度处理蓄积生长量在各生长阶段都存在显著差异,但差异随年龄的增加而减小,不同的密度处理,蓄积平均生长量达到峰值的年龄随密度的增大而减小,相同的密度不同的株行距在同一年达到峰值,数量成熟年龄与密度成反比。更多还原

【Abstract】 This paper studies the growth process of 13-year old E.urophylla×E.grandis clone plantations with 6 planting spacing in Dongmen Forest Farm.The results show that there is significant difference of the height when the stand age is more than 6 years among 6 spacing treatments,but no significant difference when the stand age is less than 6 years,the morn the stand’s distance is,the less height grows.There is highly significant difference of the DBH among 6 spacing treatments in every age,the morn the stand’s density is,the less DBH grows,and the difference is increased with stand age,and the DBH growth is mainly in the first three years,the mean annual is more than 3.5 cm of all spacing treatments aged 2.There is significant difference of stand volume among 6 spacing treatments in every age,but the difference is decreased with the stand age.The maximum mean value of stand volume of difference spacing treatment is at different age,and is decreased with the density,the same density but difference spacing,the maximum mean annual of stand volume is at the same age,the age of mature forest is inversely proportional to stand density.更多还原