Analysis and Evaluation of Early Growth of Tongmian Pinus Massoniana Clones in Western Fujian

In order to evaluate the early performance of Tongmian Pinus massoniana clones in western Fujian, the DBH, tree height and individual volume of 23 4-year-old clones were analyzed. The results showed that the traits were significantly different among clones (P<0.05). The average DBH, average tree height and average individual volume were 17.22%, 7.83% and 58.52% higher than those of local seedlings, respectively. The phenotypic variation of 23 clones was rich, and the phenotypic variation coefficient (38.35%) and genetic variation coefficient (28.67%) of individual volume were the highest, showing great improvement potential. The repeatability of each trait was greater than 0.60, and the growth was controlled by strong heredity. Through comprehensive evaluation by clustering and membership function method, 9 superior clones of C₂, C₃, C₅, C₇, C₁₀, C₁₁, C₁₂, C₁₄ and C₁₆ were selected. The average real gains of DBH, tree height and individual volume were 22.11%～25.04%, 8.42%～11.13% and 66.84% ～86.86%, respectively. The average genetic gains were 17.25%～19.53%, 6.90%～9.13% and 41.44%～53.85%, respectively. The early fast-growing advantages of the selected excellent clones are obvious, and the genetic improvement value is high, which is suitable for promotion and utilization in similar areas in Fujian Province.