首页|呼伦贝尔沙地樟子松天然林结构多样性和竞争对树木生长的影响

呼伦贝尔沙地樟子松天然林结构多样性和竞争对树木生长的影响

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沙地樟子松(Pinus sylvestris var.mongolica)天然林在中国呼伦贝尔沙地发挥着重要的生态服务功能,但林分结构和竞争作用对沙地樟子松树木生长的影响仍不明确.采用全样地调查法和树木年轮取样法,估算了 9种林分结构多样性指数和46种竞争指数,利用相关分析、多元线性回归模型等方法分析林分结构多样性与竞争对沙地樟子松天然林树木生长的影响,确定竞争和林分结构多样性在决定树木生长中的作用.结果表明:(1)树木大小比数、大小分异指数和Clark-Evans聚集指数显著影响着树木的生长;(2)竞争也是影响树木生长的重要因素,树木生长随竞争强度的增加而降低;(3)竞争、林分结构指数(大小分异指数)和树木自身属性(高径比和冠幅)共同影响了沙地樟子松树木的生长.其中竞争的影响最大,解释了树木生长约三分之一的变异性.森林管理者应多重视林分结构多样性和竞争的作用,优化林分结构与密度,提高林分生产力.
Influence of stand structure diversity and competition on tree growth of natural Pinus sylvestris var.mongolica forest in Hulun Buir Sandy Land
The natural forest of Mongolian pine(Pinus sylvestris var.mongolica)plays an important role in the ecological service functions of Hulun Buir Sandy Land area in northeastern China.However,the influence of stand structural characteristics and competition on the growth of Mongolian pine in sandy land remains unclear.This paper analyzed the effects of stand structure diversity and competition on the tree growth of Mongolian pine by calculating 9 stand structure diversity indices and 46 competition indices using the whole-plot survey and den-droecological methods.The correlation analysis and multiple linear regression models were used to distinguish the role of competition and stand structure in determining tree growth.The results indicated that:(1)The tree growth is significantly modulated by the size neighborhood comparison indices,diameter differentiation indices,and Clark-Evans clumping indices.(2)Competition is an important factor in regulating tree growth,with growth rate decreasing as competition intensity increases.(3)Competition,stand structure(diameter differentiation in-dex)and tree characteristics(height-to-diameter ratio,tree crown width)jointly controlled the growth of sandy Mongolian pine.The competition displayed the greatest effect on the tree growth,explaining about one third of the variability.In the future,forest managers should attach more importance to optimizing the stand structure and tree-to-tree competition to improve stand productivity.

individual tree competitionstand structure diversitytree growthPinus sylvestris var.mongolica

池静姚、潘磊磊、Kwon SeMyung、张晓、李雨衡、杨晓晖、时忠杰

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中国林业科学研究院生态保护与修复研究所,北京 100093

中国林业科学研究院荒漠化研究所,北京 100091

韩国公州国立大学生态修复学院,韩国忠清南道32439

单木竞争 结构多样性 树木生长 樟子松

国家重点研发计划政府间科技创新合作项目中国林业科学研究院中央级公益性科研院所基本科研业务费专项资金项目国家自然科学基金项目内蒙古自治区自然科学基金项目呼伦贝尔市科技计划项目

2022YFE0127900CAFYBB2023ZA008320715582023ZD23SF2022001

2024

10.7522/j.issn.1000-694X.2024.00028

中国沙漠
中国科学院寒区旱区环境与工程研究所

中国沙漠

CSTPCD北大核心
影响因子：1.504
ISSN：1000-694X
年,卷(期)：2024.44(5)