格氏栲与杉木混交试验初报

Preliminary Report on the Mixed Experiment of Castanopsis kawakamiiand Cunninghamia lanceolata

对格氏栲与杉木混交试验连续4年进行追踪调查和数据分析,结果表明:格氏栲与杉木混交林营造中,格氏栲成活率显著低于杉木,要提高格氏栲造林成活率,须提高格氏栲种源良种壮苗率。格氏栲与杉木混交林分中,杉木生长显著快于格氏栲,种间关系较难协调,如以格氏栲为目的树种,应降低杉木混交比例。格氏栲与杉木混交,初期试验表明,1∶1混交比例下,不同混交方式对生长影响不显著。格氏栲与杉木混交,不同混交比例中,1∶1混交模式较利于格氏栲生长,4年生格氏栲平均树高达268.6 cm,平均胸径达3.5 cm,平均冠幅达2.20 m^(2)。发展格氏栲林,采用混交造林能加快郁闭成林速度,应提倡混交造林。

This paper conducts a continuous four-year follow-up investigation and data analysis on the mixed experiment of Castanopsis kawakamii and Cunninghamia lanceolata.The results show that:In the construction of Castanopsis kawakamii and Cunninghamia lanceolata mixed forests,the survival rate of Castanopsis kawakamii is significantly lower than that of Cunninghamia lanceolata.To improve the survival rate of Castanopsis kawakamii afforestation,it is necessary to increase the robust seedling rate of Castanopsis kawakamii seed sources.In the mixed forest of Castanopsis kawakamii and Cunninghamia lanceolata,the growth of Cunninghamia lanceolata is significantly faster than that of Castanopsis kawakamii,and the interspecific relationship is difficult to coordinate.If Castanopsis kawakamii is used as the target tree species,the proportion of mixed Cunninghamia lanceolata should be reduced.The initial experiment showed that under a 1∶1 mixing ratio,different mixing methods did not have a significant impact on the growth of Castanopsis kawakamii mixed with Cunninghamia lanceolata.The 1∶1 mixed model is more favorable for the growth of Castanopsis kawakamii and Cunninghamia lanceolata in different mixing ratios.The average tree height of 4-year-old Castanopsis kawakamii is 268.6cm.The average diameter at breast height is 3.5cm,and the average crown width is 2.20 m^(2).Developing Castanopsis kawakamii forests and adopting mixed afforestation can accelerate the speed of canopy closure,and mixed afforestation should be promoted.