摘要
基于大量油松中幼人工林固定复位样地数据,选用林木大小、立地条件和林分竞争因子为自变量构建油松中幼人工林单木胸径生长的线性回归预测模型。模型复相关系数R2为0.699,影响油松单木胸径生长量的因素从大到小依次为竞争因素>立地条件>林木大小;油松单木胸径生长量随坡度增大、海拔升高、林分密度变大而减小;利用油松检验数据库对模型进行预估效果检验发现,油松平均胸径生长量预测值为1.3861略高于实测值1.3753cm,经T检验差异不显著。
Based on a lot of permanent sample data of Pinus tabulaeformis young-middle aged plantation, multi-linear regression function was used to simulate individual DBH growth of Pinus tabtdaeformi. Tree size, site conditions and stand competitive factors were selected as independent variables. The coefficient R2 is 0.696. Through stepwise multiple regression analysis, the impact on DBH growth of Pinus tabulaeformis young-middle age plantation ranked as competitive factors, site conditions and tree size. DBH growth of Pinus tabulaeformis reduced with increase of slop, elevation and stand density. With the use of test database to test individual DBH growth forecast model of Pinus tabulaeformis young-middle aged plantation, the results showed that predictive value was 1.3861 cm, slightly higher than the measured value 1.3753. The T-test showed that the difference was not significant.
出处
《沈阳农业大学学报》
CAS
CSCD
北大核心
2009年第2期197-201,共5页
Journal of Shenyang Agricultural University
基金
国家林业局“948”项目(2005-04-02)
沈阳农业大学青年教师科研基金资助项目(20070206)
关键词
油松
中幼人工林
单木胸径生长模型
Pinus tabulaeformis
young-middle aged plantation
individual DBH growth model
