摘要
在湖南会同县、绥宁县以33个杉木无性系和2个对照分别于1983年、1986年及1997年营造了单株、行状和块状3种造林形式的区组设计无性系试验林。研究发现参试无性系间胸径、树高生长量的差异在幼林期(4—7年)、中林期(13—16年)和成林期(28—31年)始终显著存在。不同无性系生长规律不同,有的无性系幼林期生长不是特别突出,但在中林期生长加快,到中林期后趋于稳定。优良无性系y18、y15在28或31年生时仍能保持前期所具有的生长优势,且在16 m立地指数和18 m立地指数条件下,生长同样突出,排名均为1、2名,表明这2个优良无性系的生长量具有一定的时间和空间稳定性。在块状造林条件下,优良无性系13年生时树高、胸径生长量和单位面积蓄积量分别大于生产种20.1%26.6%、27%31.1%、78.7%92.8%,表明发展杉木优良无性系造林可获得巨大的经济效益。
Three groups of Chinese fir （Cunninghamia lanceolata） clone test stands, designed by stem, line and block assignments, were established at Huitong county and Suilning county of Hunan province in 1983, 1986 and 1997, respec- tively, including 33 clones and 2 contrasts. Base on three survey data （ranging from 4 to 31 years old）, the variance a- nalysis was used in the study. The results showed that significantly different existed in the diameter and height growths a- mong the young-aged （4-7 years）, the middle-aged （13 to 16 years） and mature （28 -31 years） stands. Different clones followed different process of growth. Some clones grew slowly in young age period, fast in middle-aged period, and stead- ily in mature period. Two excellent clones still kept the earlier growth dominance in 31 years old, and their growth always showed good while planted at the 18 m site index or 16 m site index, their diameters and heights ranked the first and the second. The growth of the two excellent clones had temporal and spatial stabilities at certain extents. In block afforesta- tion conditions, the tree height, DBH gro~ and volume per unit area of 13-year-old excellent clones were 20. 1%-26.6%, 27%- 31.1%, and 78.7%-92.8% higher than that of the check.
出处
《林业科学研究》
CSCD
北大核心
2014年第5期598-603,共6页
Forest Research
基金
国家十二五科技支撑专题"杉木三代育种技术研究与示范(2012BAD01B0201)"资助
关键词
杉木
无性系
造林格局
生长潜力
Cunninghamia lanceolata
Chinese fir
clones
planting assignment
potential growth
