摘要
以青冈栎次生林为研究对象,采用有序聚类的方法对青冈栎生长阶段进行划分,构建各生长阶段的生长方程,并对生长方程的预测效果进行评价分析。结果表明,依据直径连年生长量划分的生长阶段:幼龄阶段1～36a,中龄阶段37～52a,其中幼龄阶段的胸径生长方程为D_幼=25.1×(1-e^(-0.023 5 A))^(1.332 2),中龄阶段的胸径生长方程为D中=17.5/1+71.708 7×e^(-0.144 6 A);依据树高连年生长量划分的生长阶段:幼龄阶段1～8a,中龄阶段9～52a,但各生长阶段的树高生长方程预测效果不理想。因此,利用直径连年生长量对青冈栎生长阶段进行划分具有一定的可行性,且各生长阶段构建的生长方程能有效地预测青冈栎胸径的生长,对青冈栎的经营研究具有一定的参考价值。
Taking the secondary forests of Cyclobalanopsis glauca as research object,the growth stage of C.glauca was divided by using the method of ordered clustering.The growth equations of each growth stage were constructed,and the prediction effect was evaluated and analyzed.It was found that the young stage was from 1 to 36 years,the medium stage was from 37 to 52 years based on the annual growth rate of the diameter.The growth equation of diameter at young stage was,at medium stage was .Based on the annual growth rate of the height,the young stage was from 1 to 8 years,medium stage was from 9 to 52 years.However,the prediction effect of height growth equation was not satisfactory.Therefore,it was feasible to divide the growth stage of C.glauca based on the annual increment of diameter,the growth of the diameter could be predicted effectively by using growth equation,it had certain reference values to the management of C.glauca .
作者
龙时胜
曾思齐
肖化顺
刘发林
刘洵
向博文
LONG Shi-sheng;ZEGN Si-qi;XIAO Hua-shun;LIU Fa-lin;LIU Xun;XIANG Bo-wen(College of Forestry,Central South University of Forestry ＆ Technology,Changsha,Hunan 410004,China)
出处
《西北林学院学报》
CSCD
北大核心
2018年第6期204-209,286,共7页
Journal of Northwest Forestry University
基金
国家林业公益性行业科研专项(201504301)
关键词
生长阶段
青冈栎
有序聚类
生长方程
growth stage
Cyclobalanopsis glauca
ordered clustering
growth equation
