摘要
应用5种常用的生长模型分别对太白红杉林源中心、适生区及高山林线范围内的太白红杉平均胸径生长过程进行拟合,选择了最优模型,并分析其生长量变化规律。结果表明:二次方程模型最适用林源中心和适生区太白红杉胸径的生长,而高山林线范围内胸径生长需通过幂函数和Logistic方程分段拟合;林源中心和适生区的连年生长量和年平均生长量均大于高山林线处,分别达0.30和0.20cm;在高山林线处,树龄70a左右年平均生长量达最大值,而林源中心和适生区均在40a左右达到最大,早于高山林线处。
Five commonly used growth models were applied in fitting the average DBH growth process of Larix chinensis growing in the origin center, suitable region, and alpine timberline, respectively. The op- timal models were selected and the variation regularities of the growth were analyzed. The results demon- strated that the quadratic model was the most suitable one for the growth of L. chinensis growing in the origin center and suitable regions, while those growing in alpine timberline had to be fitted piecewise by power function and Logistic equation. Current annual increment and mean annual increment growing in the origin center and suitable regions were higher than that in alpine timberline, reached to 0.30 cm and 0.20 cm, respectively. The maximum average annual growth was observed in the trees with the age of about 70 a growing in alpine timberline, while it was about 40 a in the origin center and suitable regions, earlier than those in alpine timberline.
出处
《西北林学院学报》
CSCD
北大核心
2012年第4期194-198,共5页
Journal of Northwest Forestry University
基金
财政部国家级自然保护区专项资金项目"陕西太白山国家级自然保护区综合科学考察"(2006)
关键词
太白红杉
生长模型
胸径
生长分析
太白山
Larix chinensis
growth model
DBH
growth analysis
Taibai Mountain
