文献类型：期刊文献

中文题名：典型中亚热带天然阔叶林林层特征及蓄积估计研究

英文题名：Study on Characteristics and Volume Estimation in Each Stratum of Typical Natural Broadleaved Forest in Mid-subtropics

作者：庄崇洋[1] 黄清麟[1] 马志波[1,2] 郑群瑞[3] 王宏[1]

第一作者：庄崇洋

机构：[1]中国林业科学研究院资源信息研究所,国家林业局林业遥感与信息技术重点实验室,北京100091;[2]中国林业科学研究院森林生态环境与保护研究所,北京100091;[3]建瓯万木林省级自然保护区管理处,福建建瓯353105

年份：2017

卷号：30

期号：4

起止页码：559-565

中文期刊名：林业科学研究

外文期刊名：Forest Research

收录：CSTPCD;;Scopus;北大核心:【北大核心2014】；CSCD:【CSCD2017_2018】；

基金：国家自然科学基金资助项目中亚热带天然阔叶林林层特征研究(31370633)

语种：中文

中文关键词：中亚热带;典型天然阔叶林;分层;主要测树因子;蓄积估计

外文关键词：mid-subtropics; typical natural broadleaved forest; stratification; key stand description factors; volume estimation

分类号：S718.54

摘要：[目的]研究典型中亚热带天然阔叶林各林层(包括全林分和各亚层)主要测树因子的特征,特别是各林层树高和蓄积的关系,探讨中亚热带天然阔叶林蓄积的估计方法。[方法]通过计算各林层林分平均胸径、平均高、标准差、变异系数等指标,分析各亚层株数和蓄积占全林分的比重,采用亚层平均高H_s和亚层中值高H_z代替林木树高H计算林分蓄积,并对结果进行相对误差和方差分析检验。[结果]表明,与全林分相比,分层后各亚层胸径和树高的变异系数明显变小,各亚层之间胸径的变异系数随亚层高度的增加而减小,而第Ⅰ、Ⅱ亚层树高的变异系数基本一致,小于第Ⅲ亚层。第Ⅰ、Ⅱ亚层的株数占全林分的20%~30%,蓄积却占全林分的90%以上。相对误差结果表明3种方法计算林分蓄积时全林分、第Ⅰ亚层和第Ⅱ亚层误差均在5%以内,第Ⅲ亚层在10%以内,方差分析结果表明3种方法算出各林层的蓄积差异p值均大于0.05。[结论]在典型中亚热带天然阔叶林中,受光层(第Ⅰ、Ⅱ亚层)的蓄积占绝对优势,是外业调查的重点。亚层平均高H_s和亚层中值高H_z代替林木树高H计算林分蓄积计算方法的误差总体上符合生产实践中精度的要求,方差分析得出3种方法计算得到的结果没有显著差异,表明在典型中亚热带天然阔叶林中采用亚层平均高H_s和亚层中值高H_z代替林木树高H计算林分蓄积,可在满足精度的同时提高工作效率。
[Objective] To investigate the key stand-description factors in strata （including the whole stand and each stratum） of typical natural broadleaved forest in mid-subtropics. [Method] The mean DBH, mean H, standard deviation （SD）, and coefficient of variation （CV） in each stratum were used to calculate, and the proportion of stems and volumes in each stratum were also analyzed. The mean height （Hs） and the median height （Hz） of stratum were used to replace the individual height （H） to estimate the volume, and the variance analysis and relative error were implemented to test the feasibility. [Result] The results suggested that the CV of whole stand was bigger than stratumⅠ, Ⅱ, and Ⅲ, the CV of each stratum increased with the height of stratum decrease, the CV of stratumⅠ and Ⅱ were coincident approximately and smaller than the CV of stratum Ⅲ. The stem proportion of stratumⅠ and Ⅱ was between 20% and 30%, but the volume proportion more than 90%. The result of the relative error suggested that the errors of the whole stand, stratumⅠ and stratumⅡ were less than 5%, and the error of stratum Ⅲ was less than 10% in each sample plot, corresponding to the accuracy of productive practice in general. The results of variance analysis showed that the value of stand volume （p） calculated in the three methods all bigger than 0.05. [Conclusion] At the typical natural broadleaved forest in mid-subtropics, the volume of light receiving stratum （including stratumⅠand stratumⅡ） is absolutely superior so it is the key point in the field investigation. The relative error among these methods in mean height （Hs） and the median height （Hz） of stratum and the individual height （H） conform to the accuracy requirement in the practices. The result of variance analysis also showed that there is no statistically significant difference in stand volumes calculated by the three methods, which means that the mean height and the median height of stratum could be used to replace the individual height to estimate the volume in typical natural broadleaved forest in mid-subtropics and meet the accuracy requirement and improve work efficiency simultaneously.