红锥种源区域试验与优良种源选择

Regional testing and superior provenance selection of Castanopsis hystrix provenances

通过在广西3个不同的区域试验点进行种源试验,结果表明:不同种源间的树高、胸径和单株材积生长均有极显著差异,不同地点间生长存在显著差异,但不及种源间显著,地点与种源的交互作用不明显;筛选出在各个区域点都表现优良的浦北和博白种源,与种源整体平均值比较,平均树高提高9.10%和12.24%,平均胸径提高13.49%,单株材积提高38.13%和44.68%,优良浦北种源的平均树高、胸径、单株材积遗传增益分别为7.44%、11.33%、30.06%,优良博白种源遗传增益分别为10.02%、11.33%、35.23%;2个优良种源在形质指标上同样表现出一定的优势,与种源整体平均比较,通直度、圆满度、枝下高、分枝角度、最大分枝、冠幅分别提高6.71%和5.97%、6.31%和5.24%、6.64%和5.59%、2.97%和3.99%、3.03%和2.32%、3.92%和2.80%。

The Provenance Testing in 3 different regional sites in Guangxi showed that the difference of average height, diameter and wood volume growth between different provenances was highly significant. The difference of growth was significant between different sites, which was no more than different provenances. There was no significant difference of interactive effects between site and provenance. Superior PUBEI and BOBAI provenance were selected which were both well performance in different sites. Compared with the provenance overall average, average height were increased respectively 9.10%and 12.24%, and average diameter were increased 13.49%, and wood volume were increased respectively 38.13%and 44.68%of PUBEI and BOBAI provenance. The genetic gain of average height, diameter and wood volume of superior PUBEI provenance were respectively 7.44%, 11.33%and 30.06%, and superior BOBAI provenance were respectively 10.02%, 11.33%and 35.23%. Compared with the provenance overall average, the two selected superior provenances showed certain advantage on tree form qualities such as stem straightness, stem fullness, clear length, branching angle, biggest branch and crown breadth, which were increased respectively 6.71%and 5.97%, 6.31%and 5.24%, 6.64%and 5.59%, 2.97%and 3.99%, 3.03%and 2.32%, 3.92%and 2.80%.