天然云冷杉针阔混交林的年龄变动及估测精度分析  

Variation of tree age for natural spruce-fir-broadleaved forests and estimation precision

作　　者：胡云云[1,2] 亢新刚[1] 高延[3] 冯启祥[3] 姚景春[3] 王卓晖[3] 

机构地区：[1]北京林业大学省部共建森林培育与保护教育部重点实验室 [2]国家林业局西北林业调查规划设计院 [3]吉林省汪清林业局

出　　处：《北京林业大学学报》2011年第4期22-27,共6页Journal of Beijing Forestry University

基　　金：林业公益性行业科研专项(200804027);"十一五"国家科技支撑计划项目(2006BAD03A08)

摘　　要：本文采用长白山地区天然云冷杉针阔混交林的14个皆伐样地数据,分析6个主要树种的径阶年龄变异系数,根据其计算不同精度下外业抽样调查估测林分年龄所需的样本量;采用平均木法估测林分年龄,分析其估测精度随着株数的变化。结果表明,6个树种的年龄变异系数随着径阶的增加,呈现波动性变化。云杉、冷杉和红松3种针叶树的年龄变异系数随径阶变化差异较小,主要在20%～35%之间变化;紫椴、枫桦和色木槭3种阔叶树则在15%～35%之间变化。采用1～3株平均木估测林分年龄精度较低,一般在30%～60%;随着株数的增加估测精度逐渐提高,一定株数后精度增加变缓,基本在90%以上,随后在最高值处上下变化。In this study, using 14 clear-cutting plots data of natural spruce-fir mixed forests with coniferous and broad-leaved trees in Changbai mountains, the age coefficients of variation across diameter classes tor six major tree species were analyzed, with which the sample sizes needed for the estimation of stand age with different precision in field work survey were calculated. Using the mean tree method, we also estimated stand age and analyzed the variation of estimation precision with the number of mean trees. The results showed that with the increasing diameter class, the age coefficients of variation h）r all six tree species had a fluctuation change. The age coefficients of variation of three coniferous trees, such as spruce （Picea jezoensis）, fir （Abies nephrolepis） and pine （Pinu.s koraiensis） had no significant difference with the values mainly between 20% and 35% ; those of three broad-leaved trees, such as linden （ Tilia amurensis） , birch （Betula costata） and maple （Acer mono） were between 15% and 35%. The precision of stand age estimation with 1 to 3 mean trees was low, ranging between 30% and 60%. With the increasing number of mean trees, the estimation precision improved gradually, then increased slowly （above 90% ） after certain number, and then fluctuated around the maximum values.

关 键 词：云冷杉针阔混交林 年龄估测 变异系数 样本量 精度 

分 类 号：S758.56[农业科学—森林经理学]