班克松种源试验研究

Provenance Test of Pinus Banksiana

班克松（ＰｉｎｕｓＢａｎｋｓｉａｎａＬａｍｂ．）７年种源试验结果表明，不同种源间树高、胸径、冠幅差异极显著，并与纬度紧密相关，随着纬度的增高，生长量递减。轮枝层数与经度呈显著负相关，其余性状与经纬度相关不显著。来自北纬４６°附近的２号、１号种源最好。

The Provenance testing on Pinus banksiana Lamb was conducted for seven years. The results show that there exists significant difference in tree height, breast diameter, and crown width among varied provenance. The trees' increment has a decrease with geographic latitude increase. The numbers of branch whorls show significant negative correlation with longitude, and the correlation between other characters and longitude and latitude are not significant. The best provenance is No1. and No.2 that come from the near areas of latitude 46°N, and the No.3 and No.5 come from latiude 50°N and 55°N respectively are the worst provenance.