Comparative Analysis on Growth Trait of Improved Varieties of Different Chinese Fir Seed Orchards

In 2018, Fujian Shaowu Weimin State-owned Forest Farm made a comparative experiment on the afforestation of 11 improved Chinese fir seed orchards, which analyzed the experimental forest growth differences of different improved Chinese fir varieties with the 3a forest age.The results show that there are significant differences in growth traits among the tested varieties when the trees at 3 years old; repetition, variety and the interaction between repeated and varieties have shown the very significant difference in tree height, DBH (diameter at breast height) and individual volume.The one with the optimal performance in tree height is the Jiangle third-generation cultivar and Weimin third-generation cultivar, which reaches 4.54 m respectively.It is 8.75% higher than the overall level.The one with the optimal performance in tree DBH is the Youxi third-generation cultivar, which reaches 7.52 cm.It is 16.20% higher than the overall level.The one with the optimal performance in individual volume is Jiangle third-generation cultivar, which is 0.0142 m³ and 37.51% higher than the overall average level.The variation coefficients of the height, DBH and stand volume of the tested varieties range from 17.56%~32.27%, 25.55%~47.49% and 52.03%~98.17% respectively.Youxi and Yong'an third-generation cultivar were ranked top 5 in each trait, which means that the two varieties grow well in Shaowu area.The two varieties were high in stability and small in variety differentiation, and adapt to the local site conditions and climate.It can be uesd as a reference for Shaowu area promotion and application of improved varieties.