| Cyclobalanopsis gilva and C.myrsinifolia are evergreen broad-leaved trees of subtropical zone in China.They grow fast and have strong adaptability,and are mainly used for the construction of precious timber forest and the ecological restoration of degraded forest.The afforestation evaluation of these two Cyclobalanopsis species in multiple experimental plots was carried out to measure the growth,form-quality traits of the same family under the different site conditions,measure the interaction between the families and the site environment,and to evaluate the stability of the families,which could provide the preliminary research basis for the breeding of its superior varieties.Based on the genetic determination forest constructed in 2019 with one-year-old container seedlings of two excellent families in Jiande in Zhejiang,Fenyi in Jiangxi and Anyuan in Jiangxi,SAS software was used to analyze the differences of family traits,heritability and genetic correlation,as well as the interaction between families and locations.Principal component analysis and BLUP method were used to conduct the primary selection of excellent families.To study the genetic variations and genetic stabilities of the growth,form-quality traits of two 3-year-old young stands of C.gilva and C.myrsinifolia in three experimental sites,analyze the genetic variation rule of the families and the interaction between the family and site,and screen out the fast growing and high quality C.gilva and C.myrsinifolia families for different regions and sites.The results obtained were as follows.(1)The growth and orm-quality traits of the two Cyclobalanopsis species different families reached a very significant level,with high family heritability was high,while the individual heritability was low.There was a high correlation between traits of different families,and site had a great influence on their growth.The average tree height and ground diameter of 3-year-old C.gilva were 2.04 m and 3.15 cm,respectively,and the estimated family heritability of tree height,ground diameter,crown width and longest branch length were higher(0.393-0.753),compared with family heritability,individual heritability estimates was relatively low.The correlation between traits of different families was higher,and the families with excellent performance in tree height and ground diameter performance had more straight trees,with fewer branching trunks and long and thick branches.The effect of place of origin on the growth of C.gilva were significant.The interaction between the family and the planting site was obvious,and the site had a great influence on the growth.The growth and form-quality traits of C.myrsinifolia were greatly influenced by family genetics,and most of the traits were controlled by moderate to strong genetics,and there was a certain interaction effect between family and environment.There was also a significant correlation between the characters of the families.The families with prominent growth in tree height and ground diameter had many thick branches,thick branches and leaves,and wide crown.(2)The first two principal components of the GGE biplot analysis of the two species of Cyclobalanopsis had higher variance explanation percentage.The results of the GGE biplot for tree height and ground diameter were different,and the families were different in growth,yield and stability,indicating that the interaction between family and location was significant.The best place of distinguishing for C.gilva was Anyuan,and was Jiande for C.myrsinifolia.The variance explanation percentage of the first two principal components(PC1 and PC2)in GGE biplot analysis based on tree height and ground diameter BLUP data were 94.22%and 90.5%,respectively.GGE biplot based on tree height showed that there was a positive correlation among the test sites,which were divided into two groups: Fenyi and Anyuan in Jiangxi were grouped together,Zhejiang Jiande was another group;GGE biplot of ground diameter showed that there was also a positive correlation between the three test sites,which were also divided into two groups: Jiande and Fenyi were in one group,and another group was Anyuan in Jiangxi.The variance interpretation percentage of the first two principal components(PC1 and PC2)in C.myrsinifolia GGE biplot analysis based on tree height and ground diameter BLUP data were 83.54% and 91.62%,respectively.GGE biplot based on tree height showed that there was a positive correlation between the test sites,which were divided into two groups: Fenyi and Anyuan in Jiangxi were one group,Jiande was another group;GGE biplot With respect to the geoid,there was a close correlation between Jiande and Anyuan,while no correlation between Jiande and Anyuan,and a negative correlation between Jiande and Anyuan,and The grouping is the same as the tree height.(3)The change of planting habitat had a great effect on the growth,form-quality of the two Cyclobalanopsis species families.Among the three test sites.The Jiande site showed the best growth performance in the three test sites for C.gilva,followed by Anyuan and Fenyi.HNCB8 and HNHT5 ranked highest in the growth,form-quality of the three test sites,showing a good overall performance.The top 20% BLUP values of tree height and ground diameter were selected,and a total of 13 excellent families were initially selected from the three test sites,among which HNCB8 was the family selected for all three sites.According to the comprehensive ranking of growth,form-quality characters,the C.myrsinifolia No.1family showed good and stable performance in the three sites.Based on BLUP method of the mixed linear model of tree height and ground diameter of different families,a total of 12 excellent families were initially selected from the three test sites,but no excellent families were selected from all the three test sites.In conclusion,C.gilva and C.myrsinifolia have abundant genetic variation,the family heritability is relatively high,and the site environment has a great influence on the family.Relevant research provides a certain theoretical basis for the selection and application of the two excellent Cyclobalanopsis species families. |
PDF Full Text Request