大同山杉木人工林林分空间结构与种内竞争关系  

Spatial Structure of Forest Stand and Intra-specific Competition in the Cunninghamia lanceolata Plantation in Datong Mountain

作　　者：曹雨婷 叶生晶 张超 周维 宁晨[1] Cao Yuting;Ye Shengjing;Zhang Chao;Zhou Wei;Ning Chen(Central South University of Forestry&Technology,Changsha 410014,P.R.China;Central South Inventory and Planning Institude of National Forestry and Grassland Administration)

机构地区：[1]中南林业科技大学,长沙410014 [2]国家林业和草原局中南调查规划院

出　　处：《东北林业大学学报》2024年第5期8-12,18,共6页Journal of Northeast Forestry University

基　　金：国家自然科学基金面上项目(32271731)。

摘　　要：为了解大同山国有林场不同龄组杉木人工林林分空结构特征与种内竞争强度的相关性,以大同山国有林场杉木人工林为研究对象,根据幼龄、中龄、近熟、成熟4个龄组共设置8块标准地,应用样地数据,通过计算林分空间结构参数,分析林分的空间结构特征和林分竞争关系。结果表明:(1)杉木人工林在水平维度上普遍处于密集状态,除幼龄林外,其他龄组的林木密集度指数较高,各个龄组杉木人工林的林分密度集分布在0.436 3~0.863 6,各龄组林分内对象木的密集程度处于密集状态。(2)杉木人工林的林分垂直结构较为简单,垂直空间的利用率较低,各龄组样地的林层指数随林龄增加而呈现减小-增大-减小的趋势,且各龄组大部分对象木的林层指数为0~0.33。(3)杉木人工林的密度集和竞争指数的相关性比林层指数和竞争指数的相关性相对较强,林分密集度和竞争指数的相关系数随林龄的增加呈规律性变化;林层指数和竞争指数也存在较强的相关性,但随林龄变化不明显。To understand the relationship between stand spatial structure characteristics and intra-specific competition intensity in different age groups of Cunninghamia lanceolata plantations in Datong Mountain State-owned Forest Farm. The C. lanceolata plantations in Datong Mountain State-owned Forest Farm were selected as the research subject, and a total of eight sample plots were established for four age groups: young, middle-aged, near-mature, and mature. Using plot data, spatial structure parameters were calculated to analyze the spatial structure characteristics and stand competition relationships. The results showed: (1) C. lanceolata plantations were generally in a dense state in the horizontal dimension, with high stand density indexes for all age groups except for young stands. The stand density distributions of C. lanceolata plantations in each age group ranged from 0.436 3 to 0.863 6, with stand density levels of individual trees in each age group in a dense state. (2) The vertical structure of C. lanceolata plantations was relatively simple, with low vertical space utilization rates. The forest layer index of each age group sample plot decreased-increased-decreased with increasing stand age, and most individual trees in each age group had forest layer indexes ranging from 0 to 0.33. (3) The correlation between stand density and competition index in C. lanceolata plantations was relatively strong compared to the correlation between forest layer index and competition index. The correlation coefficient between stand density and competition index showed regular changes with increasing stand age. There was also a strong correlation between forest layer index and competition index, but the correlation was not significant with stand age variations.

关 键 词：杉木人工林 林分空间结构 种内竞争 大同山国有林场 

分 类 号：S715.3[农业科学—林学]