滇西南西南桦天然林优树选择标准  

Study on Selection Standard of Betula alnoides Superior Tree from Natural Forests in Southwestern Yunnan Province

作　　者：何俊 杨斌[2] 陈宏伟[2] 史富强 陈伟[2,3] 

机构地区：[1]云南省普洱市林业科学研究所,云南普洱665000 [2]云南省林业科学院 [3]国家林业局重点开放性实验室云南珍稀濒特森林植物保护和繁育实验室,云南省森林植物培育与开发利用重点实验室

出　　处：《现代农业科技》2013年第4期169-170,174,共3页Modern Agricultural Science and Technology

基　　金：国家林业公益性行业科研专项(200704041)

摘　　要：采用5株优势木对比法,在滇西南地区9个县的西南桦天然次生林中,共初选出优树60株,优势木300株。经配对t检验法分析,确定西南桦天然次生林中的优树选择标准为:树高应大于5株优势木平均高的16%,胸径应大于5株优势木平均胸径的25%,材积应大于5株优势木平均材积的80%,利用此标准,对初选的60株优树进行复选,最终选择出Ⅰ级优树21株,入选率35%,Ⅱ级优树13株,入选率21.7%。Taking the comparison methods of 5 dominant tree and mean tree,60 superior trees and 330 dominant trees of Betula alnoides were selected out from the natural secondary stand in nine counties of southwestern Yunnan Province. On the basis of t test,selection standard of Betula alnoides superior tree was formulated as tree height,DBH and volume were 16% ,25% and 80% higher than mean tree,respectively.Using this standard, sixty preliminary selected superior trees were selected again, twenty-one were selected as grade I superior trees, thirteen were selected as grade II superior trees, with that selection rates of 35% and 21.7%, respectively.

关 键 词：西南桦 天然林 优树选择 T检验 5株优势木 滇西南 

分 类 号：S792.159[农业科学—林木遗传育种]