基于TWINSPAN分类的天然云冷杉-阔叶混交林生长发育阶段划分
Growth and Development Stages Division of Natural Spruce-fir-broad-leaved mixed forest Based on TWINSPAN Classification
投稿时间:2018-08-13  修订日期:2018-09-26
DOI:
中文关键词:  天然云冷杉-阔叶混交林  生长发育阶段  TWINSPAN分类
英文关键词:Natural spruce-fir-broad-leaved mixed forest  Growth and development stage  TWINSPAN classification
基金项目:国家重点研发计划项目课题“长白山次生林抚育更新技术研究与示范”(2017YFC0504101)
作者单位E-mail
周梦丽 中国林业科学研究院资源信息研究所 1257304343@qq.com 
雷相东 中国林业科学研究院资源信息研究所 xdlei@ifrit.ac.cn 
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中文摘要:
      摘要:[目的]划分天然云冷杉-阔叶混交林的生长发育阶段,为按阶段进行经营管理提供一定的理论依据和技术支持。[方法]以吉林省一类连续清查中的172块云冷杉阔叶混交林为对象,基于TWINSPAN双向指示种数量分类法,通过对云冷杉阔叶混交林的生长、物种多样性和空间结构进行比较分析,划分云冷杉阔叶混交林的生长发育阶段。[结果]结果表明:TWINSPAN法将云冷杉阔叶混交林分为四类(1、云冷杉硬阔叶混交林;2、云冷杉硬阔叶混交林;3、云冷杉桦木混交林;4、红松云冷杉硬阔叶混交林),类1:云杉(蓄积百分比约34%)平均树高值最大,硬阔叶类次之;类2:云杉虽居于主林层上层,但蓄积百分比约19%,软阔叶类的平均树高较低于云杉;类3:云杉和红松蓄积百分比及平均树高均基本相等,分别为15%和15.95m,硬阔叶类居于主林层中层;类4:红松(蓄积百分比约37%)处于主林层上层,云杉次之,硬阔叶类第三。各类林分直径结构分布相似,均为倒J形分布,且各类直径分布的卡方检验统计量χ2均小于相应自由度的卡方分布临界值。各类林分间的生长指标、定期生长量以及枯死存在一定差异,其大小排序:类2<类3<类1<类4。各类林分间的物种多样性存在一定差异,其中,丰富度的大小排序:类2>类3>类4>类1,类2、类3的物种优势度低于类1、类4。[结论]根据以上分类和特征分析,云冷杉阔叶混交林的生长发育阶段依次为:云冷杉硬阔叶混交林、云冷杉红松软阔叶林、云冷杉桦木混交林、红松云冷杉硬阔叶混交林。
英文摘要:
      Abstract: [Objective] The growth and development stages of natural spruce-fir and broad-leaved mixed forest were divided to provide theoretical basis and technical support for its management. [Method] In this paper, 172 permanent sample plots of spruce-fir-broad-leaved mixed forest from national forest inventory in Jilin province were selected for initial classification based on the TWINSPAN two-way indicator species quantitative classification analysis techniques. The growth, the species diversity and stand structure of spruce-fir mixed forest were compared and analyzed to further divide the development stage. [Result] The result indicated that the spruce-fir-broad-leaved mixed forest was divided into four groups (group 1: spruce-fir hard broadleaf mixed forest; group 2: hard- and soft- broadleaf mixed forest; group 3: spruce-fir Korean pine hard-broadleaf mixed forest; group 4: Korean pine spruce-fir hard broadleaf mixed forest) by TWINSPAN. For the first group, the average height of spruce (stand volume percentage is about 34%) is the highest and the hard-broadleaf follows; for the second group, spruce stands on the top of the main forest layer but the accumulation percentage of spruce is about 19% and the average height of soft broadleaf is lower than that of spruce; for the third group, the accumulation percentage and the average height of spruce and Korean pine are basically equal and their value are 15% and 15.9m respectively and the hard broadleaf is located in the middle layer of the main forest layer; for the fourth group, Korean pine (accumulation percentage is about 37%) stands on the top of the main forest layer and the spruce is next and the hard broadleaf is third. The diameter distributions of all kinds of stands were similar and inverted J shaped distribution. Chi square test statistics for all kinds of diameter distributions are all less than the critical values of chi square distribution of corresponding degrees of freedom. The growth indicator, periodic annual increment and mortality in all kinds of forests had a certain difference and their size and rank by 2nd group, 3rd group, 1st group and 4th group. The species richness ranked by descending order as 2nd group, 3rd group, 4th group and 1st group. Species dominance of the second and third group were lower than that of the first and fourth group. [Conclusion] According to the above classification and characteristics analysis, the development stage of spruce-fir-broad-leaved mixed forest was spruce-fir hard broadleaf mixed forest, spruce-fir Korean pine hard broadleaf mixed forest, spruce-fir birch mixed forest, Korean pine spruce-fir hard broadleaf mixed forest in turn.
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