摘要
为制定峦大杉苗木质量分级标准,分别应用逐步聚类法和平均值±标准差法进行峦大杉苗木质量分级研究,经分析比较2种方法各等级苗木比例、标准与造林成效的差异,确定合理的峦大杉苗木质量分级方法与分级标准。结果表明:采用苗高、地径作为峦大杉苗木质量分级依据是可行的;2种不同方法制定的峦大杉等级苗木比率、等级取值范围、相邻等级性状与造林成效有着明显差异;应用平均值±标准差法划分的峦大杉的苗高、地径与造林成活率、高生长量均随着苗木等级升高而显著递减;应用逐步聚类法划分的峦大杉的苗高、地径与造林高生长量均随着苗木等级升高而显著递减,但在Ⅰ、Ⅱ级苗木间造林成活率无显著差异。综合各等级苗木比率、等级取值范围、相邻等级性状差异与造林成效,峦大杉苗木质量分级宜采用平均值±标准差法进行,其分级标准为Ⅰ级苗H≥47.5 cm,D≥0.63 cm;Ⅱ级苗27.0 cm≤H<47.5 cm,0.36 cm≤D<0.63 cm;苗高、地径中的任何一项达不到等级标准,则下降苗木等级一级。
1n order to establish seedling quality grading standards of Cunninghamia konishii,seedling quality grading standards of C.konishii were studied by using progressive clustering method and mean土standard deviation method,the proportion,standard and planting effectiveness of different grades of the 2 different methods were analysed and compared,thus suitable grading method and standards were determined.The results showed that it was feasible to use the seedling height and ground diameter as index for grading of C.konishii seedling.There were obvious difference in the grades seedling ratio,the character indexes range of grades,the difference of character indexes between the adjacent grade and the planting effectiveness of C.konishii seedling among using 2 different methods.Seedling height,ground diameter and afforestation seedling survival rate,high growth of C.konishii decreased significantly with the increase of seedling grade by mean±standard deviation method;seedling height,ground diameter and afforestation seedling high growth of C.konishii decreased significantly with the increase of seedling grade by progressive clustering method,but there was no significant difference in the survival rate of afforestation seedlings between the first and the second grade.Mean±standard deviation method was more feasible for seedling grading C.konishii by comprehensive the seedling grades ratio,the character indexes range of grades,the character indexes difference between the adjacent grade and the planting effectiveness of all sorts grades,and grading standard was as follows:Seedling with height no less than 47.5 cm and ground diameter above 0.63 cm were classified as the first grade.those with height less than 47.5 cm and above 27.0 cm,and ground diameter lower than 0.63 cm and above 0.36 cm belonged to the second grade.If 1 item of the seedling height,ground diameter does not meet the grade standard,then drop it a grade.
作者
欧建德
康永武
Ou Jiande;Kang Yongwu(Forestry Bureau of Mingxi County,Sanming Fujian 365200,China;Forestry Bureau of Slia County,Sanming Fujian 365500,China)
出处
《西南林业大学学报（自然科学）》
CAS
北大核心
2018年第2期172-176,共5页
Journal of Southwest Forestry University：Natural Sciences
基金
福建省属公益类科研院所基本科研专项(2011R1013-2)资助
关键词
峦大杉
苗木分级
造林成效
逐步聚类法
质量
Cunninghamia konishii
seedling grading
planting effectiveness
progressive clustering method
quality
