基于近自然林业经营的不同密度林木竞争关系比较分析  

Comparative Study on Competition Relationship of the Forests with Different Densities Based on Near-nature Forestry Management

作　　者：殷鸣放[1] 薛娟[1] 宁良智 何影 陈晓非 

机构地区：[1]沈阳农业大学林学院,辽宁沈阳110866 [2]清原县大边沟林场,辽宁清原113300 [3]清原县林业局,辽宁清原113300

出　　处：《西北林学院学报》2013年第5期149-153,199,共6页Journal of Northwest Forestry University

基　　金：国家林业局"948"项目(20090447);中央财政林业科技推广示范资金项目"多功能林经营与调控技术推广"

摘　　要：以清原满族自治县大边沟林场的林分施业法试验区为研究对象,从近自然林业经营理念出发,利用Hegyi简单竞争指数模型定量分析了3种不同密度林分竞争指数与胸径的关系、林木胸径生长量与竞争指数的关系以及林木种内与种间竞争关系,以此探求林分近自然经营模式。研究表明:林木受到的竞争强度随着径级的增大而逐渐减小;随着林分密度增大,林木各径级受到的竞争强度也随之增大;当胸径达到30cm以上,竞争强度趋于稳定,维持在较低水平。竞争指数越大,胸径生长量越小;林分密度越大,林木受到的竞争强度越大,平均胸径生长量就越低。从种内与种间竞争的分析来看,低密度区种间竞争大于种内竞争,中密度区和高密度区种内竞争均大于种间竞争,且林分密度越大,种内竞争强度越大。Taking the ＂Test Area of Forest Stand Management Method＂ research object that was located in Dabiangou Forest Farm in Qingyuan, Liaoning, China, and based on the management concept of near-na- ture forestry （NF）, Hegyi competition index of individual tree was used to analyze the relationship be- tween the competition index and diameter at breast height （DBH）, the relationship between DBH growth and competition index, the intraspecific and interspecific competition intensity of forest, aiming to explore the NF management pattern. The results indicated that the competition intensity of natural secondary for- est decreased gradually as the DBH classes of forest; the competition intensity of each diameter classes be- came larger along with the increase of stand density; the competition intensity varied little when the DBH of trees was more than 30cm. The DBH growth decreased along with increase of trees＂ competition index; the competition intensity of trees became larger and the DBH growth became lower along with the stand density; the analysis of the intraspecific and interspecific competition intensity of trees showed that inter specific competition intensity was bigger than intraspecific competition intensity in low density stand; in- traspecific competition intensity was bigger than interspecific competition intensity in middle and high den sity stands and intraspecific competition density rose along with the stand density.

关 键 词：蒙古栎 竞争指数 种内竞争 种间竞争 

分 类 号：S758[农业科学—森林经理学]