西藏柏木优树选择研究  

A Study on Plus Tree Selection of Cupressus torulosa

作　　者：万军[1] 干少雄[1] 

机构地区：[1]四川省林业科学研究院,四川成都610081

出　　处：《四川林业科技》2003年第2期33-37,共5页Journal of Sichuan Forestry Science and Technology

摘　　要：通过对220个样地调查资料分析,得出以胸径为主要选择性状,辅以树高及形质指标作为西藏柏木优树选择依据。优树标准为:树高、胸径为样地均值加2 64和3 0个标准差,或树高大于三株优势木24 7%,大于五株优势木29 0%;胸径分别大于三、五株优势木47 5%和53 2%;树干通直无弯(树干通直度Ⅰ级);直立不倒伏(树干倒伏级Ⅰ级);高径比80～110;健康且树型为尖塔型或圆锥型。通过评分法确定总分90分以上为Ⅰ级优树。Through analysis of about 220 investigated sample plots,results have shown that DBH,H and quality index can be used as plus tree selection basis,among which DBH is main index.Standards of plus tree are that H and DBH are average value plus 264 and 30 standard errors respectively,and its H is 247% bigger than heights of three dominant,or 290% bigger than those of five dominant.Its DBH is 475% and 532% greater than DBH of three and five dominant respectively.Its stem is straight.The ratio value of H and DBH of the plus tree is 80～110.The plus tree is healthy,which shape is like pinnacle of taper type.Trees are the firstclass plus trees whose total points are above 90 by the means of score.

关 键 词：西藏柏木 优树 标准 评分 

分 类 号：S758.8[农业科学—森林经理学]