河南引种火炬松种源中龄林木材基本密度的变异

对河南引种火炬松两批种源（耐寒火炬松和一般火炬松）木材基本密度的变异进行研究，结果表明：火炬松种源间木材基本密度差异显著，木材基本密度种源内差异种源间差异更大，种源基本密度性状受环境影响较大。种源间各年轮段木材基本密度均近似于正态分布，且随树龄增加而增大，呈现出径向递增的模式。木材基本密度早晚期相关性随树龄增大而加强，５年生木材基本密度预估１２年生木材基本密度是可行的。一般种源木材基本密度与纬度呈不显著的负相关，与经度呈显著的正相关；耐寒种源木材基本密度与纬度呈不显著的正相关，与经度呈不显著的负相关。

Variation of Wood Density Among Provenance of Exotic Loblolly Pine Grown in South of Henan Province

s The test stands of 18 cold tolerance provenance (CTP) and 22 common provenance (CP) of exotic loblolly pine were planted in southern mountains of Henan Province of China in 1984 and 1985. The significant differences in wood basic density were found among provenances of two stands. The difference within a given provenance was greater than that among provenances and the site had a great effect on wood density. Variation in wood basic density of loblolly pine at different age was normal distribution. With tree age its wood density increased from pith to bark in radial direction. The early late coefficient of wood density were examined to be distinct at 0.001 level. This showed that it was practical to predict basic density of old tree at early stage. In common provenance of loblolly pine wood basic density was negatively correlated with their local latitudes, which was not notable at 0.05 level. But it was significant positively correlated with their local longitudes at 0.05 level. In cold tolerance provenance wood basic density was related positively to the latitudes and negatively to the longitudes and their significance was not distinct at 0.05 level.