摘要
青钩栲(Castanopsis kawakamii Hayata)是福建中亚热带区域性代表种。在我国除三明市莘口格氏栲天然林保护区有成片的青钩栲优势种群以外,其区域性分布仅呈零星少量。为了繁衍珍贵树种资源,推广多树种造林,莘口教学林场自60年代以来,人工成片驯化栽培珍贵树种达45个,计400ha之多。其中青钩栲人工林23年生蓄积量高达163m^3/ha,最大单株材积为0.922m^3(胸径42cm,树高18m)。是一个很成功的造林树种。研究青钩栲人工林生态系统的生产力,可对制定合理的营林技术措施提供一定的依据。
Results of the study on productivity of plantation system of Castanopsis kawakamii at age 23 showed that stand biomass was 169.302 t/ha and 107.530 t/ ha for plantations with closed canopy on site class Ⅰ and Ⅱ, respectively. The biomass of tree layer for site class Ⅰ was 168.67 t/ha accounting for 99.57％, while, on class Ⅱ it was 105.47 t/ha accounting for 98.08％ of the total. Index of leaf area of plantations on site class Ⅰ was 7.712 m^2/m^2 and 5.74lm^2/m^2 on site class Ⅱ. Within plantation trees with large diameter ed to have greater values in the distribution of organ biomass, especially in plantations for which early thinning were done on site class Ⅰ. It was also found that competitive index of individual trees was larger in plantations than that in natural forest stands. Theoretical value of stem biomass of intermediate trees in plantations was 124 kg that was 0.122—0.236 times of that for trees in natural stands, trees in plantations started rapidly growing 9 to 22 years earlier than those in natural stands. In plantations on site class Ⅰ the net production of individual trees was around 7000 kg/ha.a after age 13 and 5000kg/ha.a after age 16 on site class Ⅱ, but both appeared to be increased after age 23. Curves of annual and average net production did not crossed each other.
出处
《林业科学》
EI
CAS
CSCD
北大核心
1992年第5期439-444,共6页
Scientia Silvae Sinicae
