黑龙潭树木园引种美国黄松生长调查

Investigation on the Growth of Introduced Pinus ponderosa in Helongtan Arboretum

对榆林黑龙潭山地树木园引种的美国黄松生长状况做了调查,并和油松进行了比较,结果表明,美国黄松和油松的树高、胸径、材积生长量有差异,但未达到显著水平;其冠幅小于油松,针叶长度远大于油松,二者差异显著。树高、胸径和材积3个生长指标,美国黄松具有很好的相关性,相关系数均在0.9以上;而油松的树高与胸径相关系数仅为0.583。对于榆林黑龙潭山地树木园而言,油松和美国黄松都是外来树种,引入该地后成活率高,生长量大,适应性强,具有较高的推广价值。

This paper deals with the growth indexs of Pinus ponderosa and P. tabulaeformis on the basis of the field investigation in Helongtan Arboretum, Yulin, Shaanxi provine. The results indicated that the height, diameter and volume growth of P. ponderosa and P. tabulaeformis had differences. but not significant. Crown of P. ponderosa is smaller than that of P. tabulaeformis, while needles are far more longer than those of P. tabulaeforrnis. Compared to P. tabulaeforrnis, height, diameter and volume growth of P. ponderosa has a good have good correlations with correlation coefficient over 0.9 on average. Correlation coefficient between height and diameter growth of P. tabulaeforrnis is only 0. 583. About twenty years trial plantation in Helongtan arboretum proved that P. ponderosa and P. tabulaeformis are good conifers with fast growth and strong adaptability, worth wider extension.