摘要
为揭示结构复杂、复层、异龄、多树种混交的中亚热带典型天然阔叶林主要树种的林木高径比特征,同时为中亚热带人工阔叶林、半天然林和天然阔叶林可持续经营提供主要阔叶树种林木高径比的典型参照,以建瓯万木林省级自然保护区内的中亚热带典型天然阔叶林14种主要树种为研究对象,运用Mann-Whitney U检验、Spearman秩相关系数、指数函数和双曲线函数分析主要树种各林层(包括3个亚层和全林)的林木高径比特征。结果表明,中亚热带天然阔叶林主要树种林木高径比平均值、最大值随亚层升高而减小,且平均值在各亚层之间总体上均有显著(P<0.05)或极显著差异(P<0.01);主要树种各林层林木高径比与胸径总体上均呈现极显著负相关(P<0.01)且相关系数较高,其中,第Ⅰ、Ⅱ亚层的相关系数明显高于全林和第Ⅲ亚层,相关系数绝对值第Ⅰ亚层为0.8061~0.8953,第Ⅱ亚层为0.7882~0.9643,第Ⅲ亚层为0.4190~0.8091,全林为0.4190~0.8489;指数函数和双曲线函数拟合第Ⅰ、Ⅱ亚层林木高径比与胸径关系的效果均较好,而拟合全林和第Ⅲ亚层的效果均相对较差;指数函数拟合全林和第Ⅲ亚层林木高径比与胸径关系的决定系数(R^(2))相对较高,均方根误差(E_(rms))和平均绝对误差(E_(ma))相对较小,而双曲线函数拟合第Ⅰ、Ⅱ亚层的R^(2)相对较高,E_(rms)和E_(ma)相对较小。主要树种各亚层林木高径比不是常数,会因所属亚层和胸径的不同而变化;主要树种各林层林木高径比与胸径关系曲线拟合是有意义且必要的,双曲线函数能更好地描述主要树种第Ⅰ、Ⅱ亚层林木高径比与胸径的关系,指数函数能更好地描述主要树种全林和第Ⅲ亚层林木高径比与胸径的关系;各树种林木高径比特征需要且可以采用各树种各林层林木高径比与胸径关系曲线表达。
Fourteen main tree species from typical natural broad-leaved stands in the mid-subtropical zone of the Jian’ou Wanmulin Provincial Nature Reserve were studied to reveal the characteristics and provide a typical reference for the tree height diameter ratio of main broad-leaved tree species for the sustainable management of artificial,semi-natural,and natural broad-leaved forests in mid-subtropical zones.The mean tree height diameter ratio,standard deviation,variation coefficient,Mann-Whitney U test,Spearman rank correlation coefficient,exponential function,and hyperbola equation were used to analyze the characteristics of the tree height diameter ratio of the main tree species in each storey(including three strata and the whole stand).The results showed that the mean and maximum values of the tree height diameter ratio of the main tree species of typical natural broad-leaved stands in the mid-subtropical zone decreased with increasing stratum height.The mean values were significantly(P<0.05)or extremely significantly different(P<0.01)among each stratum.The correlation between tree height to diameter ratio and diameter at breast-height(DBH)of the main tree species in each storey showed an extremely significant negative correlation(P<0.01).The correlation coefficients of strataⅠandⅡwere significantly higher than those of the whole stand and stratumⅢ.The absolute values of the correlation coefficients were 0.8061-0.8953 for stratumⅠ,0.7882-0.9643 for stratumⅡ,0.4190-0.8091 for stratumⅢ,and 0.4190-0.8489 in the whole stand.The effects of the exponential and hyperbolic functions on the relationship between tree height diameter ratio and DBH of strataⅠandⅡof the main tree species were better than those of the whole stand and stratumⅢ.The R^(2),E _(rms),and E_(ma) of the main tree species in the whole stand and stratumⅢwere relatively high in the exponential function fitting,while those in strataⅠandⅡwere relatively high in the hyperbolic fitting.The tree height to diameter ratio of the main tre
作者
严铭海
王金池
黄清麟
庄崇洋
郑群瑞
卓鸣秀
YAN Minghai;WANG Jinchi;HUANG Qinglin;ZHUANG Chongyang;ZHENG Qunrui;ZHUO Mingxiu(Research Institute of Forest Resource Information Techniques,Chinese Academy of Forestry,Beijing 100091,China;Key Laboratory of Forest Management and Growth Modelling,National Forestry and Grassland Administration,Beijing 100091,China;College of Forestry,Fujian Agriculture and Forestry University,Fuzhou,Fujian 350002,China;Administrative Office of Jian’ou Wanmulin Provincial Nature Reserve,Jian’ou,Fujian 353105,China)
出处
《森林与环境学报》
CSCD
北大核心
2022年第4期409-417,共9页
Journal of Forest and Environment
基金
中国林业科学研究院中央级公益性科研院所基本科研业务费专项资金重点项目“中亚热带人工林转天然阔叶林的关键技术研究”(CAFYBB2017ZC002)。
关键词
中亚热带
天然阔叶林
阔叶树种
林层
林木高径比
指数函数
双曲线函数
mid-subtropical zone
natural broad-leaved forest
broad-leaved tree species
storey
tree height diameter ratio
exponential function
hyperbolic function
