2) Large-medium sized hi-alloy steel tubular products
中大口径高合金管材
3) large-diameter timber
大径材
1.
The results show that greatly heavy thinning and heavy thinning can effectively increase stand growth in diameter increment and yield of large-diameter timber,reduce cultivation time for large-diameter timber.
结果表明:极强度间伐、强度间伐能有效提高林分直径生长量,增加大径材的出材量,缩短培育大径材的时间,及早达到木材采伐标准。
2.
Based on the analysis of market prospect and significance of large -diameter timber,afforestation skills and management model of large-diameter timber of eucalyptus were put forward by giving full play to the trilateral adva ntage of forest land.
通过综述漳州市桉树速生丰产林培育现状及发展优势,分析大径级木材市场前景和培育意义,提出了如何利用林地"三边"优势,培育桉树大径材的营造林技术和经营模式。
3.
For large-diameter timber of eucalyptus cultivation,experiment is conducted as followings: Five kinds of plant density were set as the main area,with another five kinds of fertilizer amount being secondary area.
针对桉树大径材培育,对试验地设置5种栽培密度作主区,5种施肥量作副区。
4) Big-diameter timber
大径材
1.
Fine varieties are basis of cultivating orientedly big-diameter timber of Cunninghamia lanceolata.
良种是定向培育杉木大径材的物质基础 通过对12个产地的65个杉木优良家系进行造林对比试验, 以福建邵武的杉木优良家系为对照 结果表明: 选用杉木优良家系培育大径材,可以缩短杉木大径材培育年限, 18年生已接近或达到大径材培养标准, 同时提高林分产量和大径材出材量; 分析了不同产地和不同家系之间的生长差异, 11个产地的胸径、树高、单株材积生长优于对照, 胸径生长都达到培育大径材标准; 筛选出50个速生丰产、遗传增益高的杉木优良家
2.
Using Jing an County as an example,this paper puts forward the sustainable management pattern of Chinese Fir for big-diameter timber at the level of management for the first time.
以靖安县为研究对象,从作业级层次提出了杉木大径材的经营模式,在现有18地位指数以上的杉木林地选取目标树,然后通过合理的抚育间伐、林地施肥等后期集约经营管理措施,不断调整林分密度,使目标树保留密度为1 200株/hm2左右,最终培育成大径材。
5) big-diameter wood
大径材
1.
Thinning,one of the breeding technologies of eucalyptus big-diameter wood,and its economic effects were studied.
本文就桉树大径材培育技术-间伐控制对桉树林分生长和经济效益进行分析。
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