河南火炬松种源中龄林生长量、干形特征的差异分析

The Difference Analyses of Tree Growth Characteristics Among Provenance of Exotic Loblolly Pine Planted in South of Henan Province of China

河南引种栽培的两批火炬松种源中龄林树高、胸径、材积、干形等特征存在着显著的差异。一般火炬松种源生长量性状早期预测效果很差 ;耐寒火炬松种源生长量早期选择有一定的效果 ,但其遗传决定系数仅为0 .5 0左右。一般火炬松种源原产地纬度对生长量影响较大 ,且与胸径呈显著负相关 ,反映出来自美国南部的种源在引种地生长较快。耐寒种源中 ,纬度与生长量呈正相关 ,经度与生长量呈负相关 。

The cold-tolerance provenance's and the common provenance's test stands of exotic loblolly pine were planted in south of Henan Province of China in 1984 and 1985. The distinct differences in tree height, tree diameter at breast height, tree volume and stem form of the two provenances were found. The values of tree growth increment in juvenile stage in the common provenance can not be used to predict that in middle aged or mature stage. In the cold tolerance provenance the growth increments of trees in early stages were positive significantly related to those in late stages, and the genetic selection in early stages was practicable and its genetic determined coefficient was about 0.50 . In the common provenance the local latitude had great effects on the tree growth increments and was significantly negative related to diameter at breast height of trees. This meant that some of the common provenance from the south of USA planted in the introduced place grew faster. In the cold tolerance provenance tree growth increments were positive related to the local latitude and negative to the local longitude. This meant that some provenance from the higher latitude and lower longitude districts in south of USA planted in the introduced areas grew faster