武汉引种火炬松种源基本密度的变异与综合选择的研究

１３年炎生炬松１８个种源间本材基本密度存在着显著的差异，其广义遗传力大于０．４２，并随着树龄的增大而有加强的趋势。方差分析中种源、环境方差分量各占１／２，反映出遗传、环境对火炬松基本密度有着重要的影响。株内径向基本密度以递增模式为主，林木不同生长阶段基本密度存在着显著的正相关，反映出早期测定是可行的。基本密度与种源原产地经度、纬度间相关系数很小，无明显的经向或纬向变异模式。种源内个体间基本密度的变

BASIC DENSITY VARIATION IN PROVENANCES OF EXOTIC LOBLOLLY PINE IN WUHAN AND ITS COMPREHENSIVE SELECTION

The significant difference in basic density was found among 18 provenances of 13yearold exotic loblolly pine in Wuhan. Its broad sense heritability was more than 0.42 and increased with tree age. According to the variance analyses, factors of the provenance and environment accounted evenly for 50%, which reflected that genetic and culturing site had a important effect on basic density. In radial direction, basic density increased from pith to bark. The earlylate corrlation coefficient of wood basic density were examined to be significant at 0.001 level. This showed it was practical to predict basic density of old trees at early stage. Basic density was not clearly correlated with latitude and longitude of the local provenances and it was positively related to height, diameter at breast height and volume of trees. The difference in basic density among individuls within a given provenanc was greater than that among provenances. These meant that tree increments and wood basic density may be improved