杉木生长的遗传变异研究：三水平后代试验

在杉木4个产地，分别随机选择当地起源的4个体分，每个体分选5株优势未（林分年龄均为25a以上，优势木之间相距50m以上）采种育苗造林，进行3水平后代测定，并研究了杉木生长在产地间、产地内林分间和林分内家系间3个层次的遗传变异规律。7年生时的生长测定结果表明：树高、胸径和材积在产地、林分和家系3个层次上都表现出极显著差异，3性状产地间的遗传方差分别占总遗传方差的82.7％、75.4％和78．8％；产地内林分间分别占7．0％、10。6％和10、1％；林分内家系间分别占10．3％、14、0％和11．1％。树高、胸径和材积的产地间遗传变异系数分别为11．75％、13、92％和35．82％：产地内林分间分别为3、41%、5．22％和12．83％；林分内家系间分别为4．15％6．00％和13、45％

Study on Genetic Variation of Gunninghamia lanceolata Growth:Progeny Test of the Third Generation

5 dominant trees were respectively selected in 4 random selected local 4 stands in 4 Cunninghamia lanceolata producing areas (over 25 years stand age with distance of over 50m between dominant trees) for cellecting seed, breeding and afforestation. Progeny test of the third generation demonstrated genetic variation law among producing areas, stands in producing area and families in stand of Clanccolata. Detemination on growth of 7-year resulted evident difference of tree height, D. B. H. and volume in producing areas,stands and families. Genetic variance of 3 properties among producing areas took 82. 7%. 75. 4%and 78. 8% respectively of total genetic variance; that among stands took 7. 0%. 10-6% and 10. 1%; that among families took 10. 3%, 14. 0%. and 11. 1%. Genetic variation coefficient of height, D. B. H. and volume among producing areas was 11. 75%, 13. 92%, and 35. 82%; that among stands was 3. 41%, 5. 22% and 12. 83%; that among families was 4. 15%, 6. 00% and 1 3. 45%.