摘要
[目的]评价云冷杉针阔混交林不同径级层的合理经营密度范围。[方法]以长白山云冷杉针阔混交林为研究对象,利用林分平均胸径和树冠面积建立的最大密度模型和半峰宽原理,求得大、中、小不同径级林分的合理经营密度。[结果](1)树冠面积方程方面,云杉、冷杉、红松以二次函数为主,阔叶树种组以线性方程为主,模型的有效区间胸径应在[5, 70]之间;(2)指数函数对于拟合平均胸径与不同径级层最大密度关系较好,但决定系数R^2仅在0.5～0.6之间(P<0.05);(3)小、中、大径级层合理经营密度范围分别为0.403N_(max)～1.619N_(max)、0.523N_(max)～1.754N_(max)、 0.478N_(max)～1.307N_(max)。[结论]合理经营密度株数配比在6∶3∶1、5∶3∶2、5∶4∶1等比例之间变化,且经营指数的频数分布符合正态分布。
[Objective]Present study was proposed to establish optimal stand-density models for spruce-fir forest management.[Methods]Stand-density models were developed by calculating crown-area and mean diameter at breast height(DBH)of spruce-fir mixed forest coupled with peak width at half height of forests to evaluate the range of optimal density of different diameter class layers in Changbai Mountain.[Results]The results were shown that:(1)quadratic equation could be employed to determine the crown-area function of Abies nephoriepis,Picea jezoensis,and Pinus Koraiensis,while deciduous species were evaluated accurately with linear equation;(2)exponential equation was more fitting for the relationships between various diameter class layers and mean DBH,however,the range of determination coefficient was only 0.5~0.6 with significance index less than 0.05;(3)the ranges of optimal stand-density of small,medium,and large diameter class layers were determined as 0.403 N max^1.619 N max,0.523 N max^1.754 N max,and 0.478 N max^1.307 N max,while the proportion of numbers of trees were 6∶3∶1,5∶3∶2,5∶4∶1,respectively.[Conclusion]Frequency distribution of management indexes of spruce-fir forest conformed to normal distribution.
作者
张梦弢
亢新刚
杜志
王新杰
杨英军
王全军
Zhang Mengtao;Kang Xingang;Du Zhi;Wang Xinjie;Yang Yingjun;Wang Quanjun(College of Forestry, Shanxi Agricultural University, Taigu 030801, China;Key Laboratory for Silviculture and Conservation of Ministry of Education, Beijing Forestry University, Beijing 100083, China;Central south Inventory And Planning Institute of National Forestry and Grassland Administration of PR Changsha 410000, China;Wangqing Forestry Bureau, Wangqing 133200, China)
出处
《山西农业大学学报（自然科学版）》
CAS
北大核心
2019年第1期41-47,共7页
Journal of Shanxi Agricultural University(Natural Science Edition)
基金
山西农业大学科技创新基金项目"(2015YJ17)
山西省林业科技创新课题(201721)
作者简介
张梦弢(1983-),男(汉),山西大同人,副教授,博士,研究方向:森林可持续发展.
