Assessment and Selection on the Genetic Resource Tect Plantation of Lobiolly Pine Introduced from Zimbawe
Genetic resource of loblolly pine (Pinus taeda ) represented by 50 fami lies were evaluated for to study the growth performance in seedling and young st age. The result showed that there was significant difference for single-tree volume at the age of 5. Fourteen families (include 3 check families) were significantly different from the most inferior one and were considered as superior families. Under the selection rate of 30% for family, the genetic gain for volume was esti mated t o be 3.1%, with combined selection and 148 selected trees. Height growth at the age of 1 and 3 was relative or extreme significantly correlated with the volume growth at the age of 5. Therefore, the test plantation could be measured only by height, in order to reduce work load, three statistical methods were compared f or their using results. Maintenance rate and loss rate of superior families at t he age of 5 were compared when selecting the top one third or superseding the bo ttom one third of all the families. It was suggested that early selection should be implemented by superseding the inferior families.
NETL
NSTL
万方数据
维普
