美国黄松个体高生长过程研究  

A Study on Height Growth Process of Pinus ponderosa

作　　者：侯琳[1] 唐德瑞[1] 王谊[1] 李骁 

机构地区：[1]西北农林科技大学林学院,陕西杨陵712100 [2]周至县林业局,陕西周至710400

出　　处：《西南林学院学报》2003年第1期10-12,20,共4页Journal of Southwest Forestry College

基　　金：国家"948"项目资助 ( 98-4 -0 5 )

摘　　要：运用SAS软件 ,建立美国黄松树高生长量与树龄的间的回归方程 .生长模型分析表明 :1 4龄前美国黄松高生长缓慢 ;1 4～ 1 8龄 ,高生长最快 ;1 8龄后高生长速率变慢 .据此 ,可将美国黄松的生长过程划分为“慢—快—慢”3个生长阶段 .在此 3阶段中 ,树高平均生长速度分别为0 31m/a ,0 75m/a和 0 5 6m/a.对应于不同的生长阶段 。Regression function of height-age of Pinus ponderosa was established by SAS software.Height growth model analysis indicates that before 14,between 14 to 18 and after 18,velocity of height growth of Pinus ponderosa has been lowest,fastest and decreasing,respectively.Based on the above,process of growth of Pinus ponderosa has been divided into three stages as'slow-fast-slow'.In the three stages,the average velocity of height growth of Pinus ponderosa is 0.31 m/a,0.75 m/a and 0.56 m/a,respectively.Connected with different stages,measures of management have been proposed.

关 键 词：美国黄松 SAS软件 高生长量 树龄 回归方程 生长速度 生长阶段 

分 类 号：S791.24[农业科学—林木遗传育种]