基于Hegyi改进模型的青冈栎次生林竞争分析
收稿日期: 2017-12-22
修回日期: 2018-01-19
网络出版日期: 2020-09-27
基金资助
国家林业公益性行业科研专项(201504301)
Analysis on the Competitive Status of Cyclobalanopsis glaucaSecondary Forest Based on the Improved Hegyi Model
Received date: 2017-12-22
Revised date: 2018-01-19
Online published: 2020-09-27
基于湖南省平江县芦头林场的12块青冈栎次生林固定样地数据,采用固定半径法、树冠重叠法以及单木影响圈分析样地内青冈栎树种的竞争状况,同时依据对象木与竞争木的树高比值对Hegyi竞争指数进行改进。结果表明:青冈栎树种的竞争影响范围随着直径的增加而增大,说明林木直径越大,竞争越激烈;青冈栎自由树冠幅模型为:CW=0.1773+0.2799×D,直径与冠幅大小呈正相关;三类竞争指标的相关性大小比较为Hegyi改进模型>Bella竞争指数>Hegyi竞争指数,说明综合考虑树木胸径比值、树高比值以及树木距离的竞争指标能更加准确地反映青冈栎次生林的竞争状况。
龙时胜 , 曾思齐 , 肖化顺 , 刘发林 , 胡满 . 基于Hegyi改进模型的青冈栎次生林竞争分析[J]. 林草资源研究, 2018 , 0(1) : 50 -56 . DOI: 10.13466/j.cnki.lyzygl.2018.01.008
The study was based on 12 fixed sample plots of Cyclobalanopsis glauca secondary forest in Loutu Forest Farm,Pingjiang County,Hunan Province.The methods of fixed radius,crown overlap and single wood influence circle were used for analysis of the competition status of Cyclobalanopsis glauca, the Hegyi competition index was improved by using the ratio of height between object wood and competitive wood.Results showed that the greater the diameter of Cyclobalanopsis glauca,the greater the scope of influence and competition.The free tree crown model was:CW=0.1773+0.2799×D,and the diameter and canopy size was positively related.The relative size of the three categories of competition indexes was Hegyi-improvement model > Bella competition index > Hegyi competition index.The results showd that the competitive index included diameter ratio,height ratio and distance and could accurately reflect the competition status of Cyclobalanopsis glauca secondary forest.
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