火炬松八年种源试验研究

本文总结了1981年在我国3个气候带7个试验点火炬松8a种源试验结果:①对不同种源火炬松的树高、胸径生长进行了显著性检验;②火炬松种源(树高、材积)×地点的互作显著;③火炬松种源2、4年生树高、胸径和至8年生高、径生长相关显著,为早期选择提供依据;④根据生长快、适应性强两项因子,综合评选出一批适合我国不同气候带及自然类型区的国外松树种及火炬松优良种源。

REPORT ON THE 8-YEAR RESULTS OF LOBLOLLY PINE PROVENANCE TEST

Provenance test was carried out in 7 locations (latitude ranges from 21.9-31.8°N) in China in 1981.Seeds of loblolly pine (10 states) were obtained from natural range of the species in the USA.There was significant variation among different seed sources of loblolly pine in 8-year height,diameter and volume growth.In 4 locations,significant positive correlations were found between growth and mean annual temperature,mean minimum temperature of January,rainfall of June-September,and frost free season;a significant negative correlation was found between growth and latitude.The interaction of seed sources by locations was highly significant for height and volume growth.The best seed sources in southern and central subtropical regions of China were from the coastal regions of Florida,South Carolina and Louisiana (Livingston).For the northern subtropical region of China,the piedmont or inland seed sources were better than the coastal seed sources due to greater cold tolerance.