林木地理变异与种源试验.ppt

第四章林木地理变异与种源试验Geographical variation and provenance test
目的(Objectives)
了解林木种内变异层次
了解林木地理变异的一般规律
理解开展种源试验的目的和作用
掌握种源试验方法,以熟悉的树种为例说明方法的具体运用
标题(Topics)
林木种内不同层次的变异
林木地理变异规律
种源试验
优良种源供应途径
一、林木种内不同层次的变异
林木普遍存在着遗传变异现象
树种之间的差异
造林时选择合适的树种。
种内的变异
研究树种内变异模式、变异的性质与数量,是制定树木改良计划的基础工作。
Variation in natural forests
The variation in autumn colouring, caused by differences in growth rhythm in a planted birch stand.
A "standard stand" selected parison material for ically improved material
In this lodgepole pine provenance trial the provenances from the most maritime area have not adapted to the winters in eastern Finland.
The differences in growth and quality between the stand lot and the plus tree progeny are clearly evident in the progeny trial
The photograph shows the wood of two 12-year-old silver birches (Betula pendula). Both trees have better than average growth. The wood on the left has a high proportion of large-vacuoled tracheids and the density is low. In contrast, the wood on the right has few and the density is correspondingly high.