不同种源白桦木材密度和生长轮宽度径向变异模式

对５个种源以及不同海拔高度和不同种植密度的白桦木材生长轮密度和生长轮宽度径向变异模式进行了研究。结果表明（１）各种源木材生长轮密度和生长轮宽度径向变异真本相同。种源间生长轮密度的平均值差异显著，吉林露水河地区。木材生长轮密度最大。其次为内蒙古金河、生长轮度大小排序为新宾、凉水、露水河，帽儿山金河。（２）木材生长轮密度在海拔高度４６０－６５０ｍ范围内呈正相关。生长轮宽度呈负相关；（３）木材生长轮密在

The Radial Variation Patterns of Wood Density and Ring Width in Different Betula Platyphylla Provenances

The radial variation patterns of wood ring density and ring width of five white birch provenancesxvere studied in different planting density and altitude. The main results obtained are' the generaltrends of the ring density and ring width profiles of the trees were similar. while there existed a significant difference in average ring density and ring width among provenances. The ring density was thebiggest in Lushuihe of Jinn province, next in Jinhe of Mongolia. the sequence of ring width was Xinbin>Liangshui >Lushuihe >Maorshan >Jinhe. the ring density was positively correlated and the ring widthwas negatively correlated with altitude within 460 ~ 650 m in Jinn Province. @ the ring density wasnegatively correlated and the ring width was positively correlated with planting density of 2 m x 3 m.3 m x 4 m and 4 m x 4 m in Heilongjiang province. planting density and altitude influenced averagering density in two aspects of the average level of the ring density variation curves and the ring width.