首页|基于林木株数与竞争指数的马尾松退化林种群结构及数量动态分析

基于林木株数与竞争指数的马尾松退化林种群结构及数量动态分析

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退化林种群结构及数量动态研究对于探明种群生存现状及发展趋势,指导种群保护及修复具有重要意义.本研究以贵州省紫云苗族布依族自治县国有浪风关林场为研究区域,针对该地典型马尾松退化林进行典型样地调查.基于林木株数与竞争指数,应用动态指数和时间序列预测等方法,综合分析研究区马尾松退化林种群结构及数量动态变化.结果显示:(1)1 297株马尾松林木包括12个龄级,由于Ⅰ龄级个体数过少,种群天然更新能力不足,导致种群呈现衰退趋势;种群内竞争强度总体上随龄级的增大而减小,但在Ⅶ龄级和Ⅳ龄级种群内竞争过于剧烈,导致种群结构不稳定.(2)种群小径级林木个体较多,马尾松种群总体呈增长型种群,受周围环境影响较小,但种群内竞争较激烈,面临较大的衰退风险.(3)随着时间推移,在未来6个龄级以后,种群中老龄级株数逐渐增多,幼龄级株数下降,种群内竞争强度逐渐趋于稳定.结果表明:幼龄级个体数量匮乏和林木间剧烈的竞争是研究区马尾松种群退化的主要原因.尽管通过自疏作用可以调节种群结构以实现稳定,但需要相对漫长的时间.建议采取主林层间伐配合林下割灌除草和补植的方式来调整种群结构,尽快实现稳定持续发展.
Population Structure and Quantitative Dynamics of Degraded Pinus massoniana Forest based on Tree Number and Competition Index
The study on population structure and quantitative dynamics of degraded forest is significance to find out the current situation and development trend of population,and to guide population protection and restoration.Taking the state-owned Langfengguan Forest Farm in Ziyun Miao Buyi Autonomous County of Guizhou Province as the re-search area,this study investigated the typical degraded Pinus massoniana forest in Ziyun Miao Buyi Autonomous County,Guizhou Province.Based on the number of trees combined with competition index,the population structure and quantitative dynamic changes of degraded P.massoniana forest in the study area were comprehensively ana-lyzed by using dynamic index and time series prediction methods.The results showed that:(1)A total of 1 297 Mas-son pine trees were investigated,including 12 age classes.Due to the small number of individuals in age class Ⅰ and the lack of natural regeneration ability of the population,the population showed a declining trend,and the intensity of intraspecific competition decreased with the increase of age class,but the intraspecific competition in Ⅶ age class and Ⅳ age class was too fierce,which led to the instability of population structure.(2)There are more individuals in the small diameter class of the population,and the cauda equina population is a growing population,which is less af-fected by the surrounding environment,but the intraspecific competition is fierce and faces a greater risk of decline.(3)With the passage of time,after the next 6 age classes,the number of aged plants in the population gradually in-creased,the number of young plants decreased seriously,and the intraspecific competition index gradually tended to be stable.To sum up,the lack of juvenile individuals and the fierce competition among trees are the main reasons for the degradation of P.massoniana population in the study area.Although the population structure can be adjusted to achieve stability through self-thinning,it takes a relatively long time.It is suggested that the main forest layer thinning combined with under-forest cutting,irrigation,weeding and replanting should be adopted to adjust the popu-lation structure and achieve stable and sustainable development as soon as possible.

Pinus massonianadegraded forestpopulation structurequantity dynamicstrees competition

申鹏、白萍、朱洲、柴宗政

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贵州大学林学院,贵州 贵阳 550025

马尾松 退化林 种群结构 数量动态 林木竞争

国家自然科学基金贵州省林业科研项目贵州大学培育项目

32001314黔林科合[2022]38号贵大培育[2019]38号

2024

西部林业科学
云南省林业科学院 云南省林学会

西部林业科学

CSTPCD北大核心
影响因子:0.807
ISSN:1672-8246
年,卷(期):2024.53(1)
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