One-Parent Progeny Test and Combined Selection of the Second Generation Seed Orchard of Cunninghamia lanceolata

Progeny test forest was built by 80 one-parent progenies of the second generation seed orchard of Cunninghamia lanceolata on National Forest Farm of Weimin,Shaowu City in Fujian Province.The data which was investigated for five consecutive years was analyzed and the results showed that there were very significant differences among families on tree height,dbh,timber volume and crown of different families.The estimations of genetic parameters indicated that all the growth traits were generally controlled by medium genetic factors except crown.Combined selection was implemented based on index selection equation group built with tree height,tree breast diameter and timber volume of 3-years-old and 5-years-old stands.8 superior families such as Jia2,Wu1,and Ding96 etc.and 15 superior individuals inside these families such as I1,I2,and I3 etc.were selected.The average genetic gains of tree height,breast diameter and timber volume of 8 superior 5-years-old families were 2.61%,6.39%and 16.98%respectively. The average tree height,dbh and timber volume of 15 superior 5-years-old individuals were 29.41%,76.39%,231.77% more than population average value respectively.At the same time 7 the worst families such as Ding65,Yi22,and Ding32 etc.were selected for eliminating from breeding population.