为了了解塞罕坝地区樟子松(Pinus sylvesris.var.mongolica)人工林的生长规律,对不同地位级条件下樟子松的胸径和树高的生长规律进行了研究。研究结果表明:1)樟子松胸径的连年生长量在最初的10年内呈逐年增加的趋势,在9~10a生左右达到最大值,约为0.90~1.20cm/a,之后逐渐下降,到20a生之后趋于稳定,年生长量约为0.4~0.5cm/a。应对10~20a生的樟子松人工林适时进行抚育间伐,以促进胸径的生长。2)与胸径相似,樟子松树高的连年生长量也在12~13a生之前呈逐年增加的趋势,12~13a生左右达到最高,年生长量可达69.99cm/a,之后略有下降,然后趋于稳定,在40cm/a上下波动。3)I地位级条件下樟子松的胸径及树高生长量明显高于II地位级。4)塞罕坝地区樟子松的年生长量高于年龄相近的大部分其他地区,包括黑龙江和内蒙古地区。

In order to understand the growth pattern of Scotch pine(Pinus sylvesris.var.mongolica) plantation in Saihanba,Hebei province,the growth of DBH and height of Scotch pine planted in different sites of the Saihanba were investigated.The results showed that the annual increment of DBH of Scotch pine increased until 10 years,and reached a peak of 0.90~1.20cm/a at about 10 years,then decreased and reached a relatively stable level after 20 years,with an annual increment of about 0.4~0.5cm/a.Thinning should be carried out for Scotch pine plantation to promote the growth of DBH.The annual increment of tree height of Scotch pine increased till 12~13 years,and reached the peak of about 69.99cm/a at about 12~13 years,then decreased slightly to a stable level,about 40cm/a.The growth of Scotch pine in Class I sites was higher than that of Class II sites.The growth of Scotch pine in Saihanba was higher than that of most of other areas,including Heilongjiang province and Inner Mongolia.