用远缘杂交后代为材料，测定了不同叶型不同时期的叶绿素含量、光合强度。
Determining different leaves kinds chlorophyl content and photosynthetic intensity in different stage by using distant crossing posterity as material.
通过子代测定选出的优良家系，其有性后代在树高、胸径和材积早期生长的遗传增益分别为8.24%，14.33%和24.16%。
The genetic gains of superior families selected by progeny tests on early tree height, diameter breast-high and volume growth were 8.24%, 14.33% and 24.16% respectively.
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