杉木纯林套种阔叶树种后林分空间结构变化及综合评价  

Spatial structure change and comprehensive evaluation of pure Chinese fir forest after interplanting broad-leaved tree species

作　　者：王萌蕾 曹小玉[1] 张泽莲 吴树萍 莫永俊 袁达 黄新华 向雨欣 WANG Menglei;CAO Xiaoyu;ZHANG Zelian;WU Shuping;MO Yongjun;YUAN Da;HUANG Xinhua;XIANG Yuxin(Central South University of Forestry and Technology,Changsha 410004,Hunan,China)

机构地区：[1]中南林业科技大学,湖南长沙410004

出　　处：《湖南林业科技》2024年第5期7-13,共7页Hunan Forestry Science & Technology

基　　金：湖南省自然科学基金面上项目(2023JJ30991)。

摘　　要：为了解杉木纯林林分空间结构变化,本文采用四株木法构建林分空间结构单元,基于福寿林场不同龄组的杉木纯林6个样地的实测数据,将定性与定量分析结合,选取角尺度、混交度、开敞度、大小比数和林层指数等5个林分空间结构指标对幼龄杉木纯林和中龄杉木纯林在套种阔叶树种前后的林分空间结构特征变化进行分析,采取乘除法对林分空间结构各个指标进行评价。根据计算出的林分空间结构评价指数,将林分空间结构划分为5个评价等级;等级越高,则表明林分空间结构越合理,林层越丰富。结果表明:(1)套种阔叶树种前,幼、中龄杉木纯林空间结构指标角尺度分别为0.3687、0.3464,混交度分别为0.1507、0.0627,开敞度分别为0.9778、0.4338,大小比数分别为0.4991、0.5225,林层指数分别为0.2495、0.3414。林分空间结构评价指数分布范围是0.1862~0.3876,1级样地数占样地总数的16%,2级样地数占样地总数的84%。(2)套种阔叶树种后,幼、中龄杉木纯林空间结构指标角尺度分别为0.3289、0.2197,混交度分别为0.3857、0.1629,开敞度分别为1.7182、0.7136,大小比数分别为0.4064、0.4377,林层指数分别为0.3063、0.5123。林分空间结构评价指数数值分布范围是0.5921~0.8573,4级、5级样地数各占样地总数的50%。研究结果可为杉木纯林套种阔叶树种这一林分空间结构优化经营措施的实践提供新的参考依据。In order to know about the spatial structure change of Chinese fir pure forest stand,four-tree method was used to build stand spatial unit and five stand spatial structure indexes including angle scale,mingling index,open degree,neighborhood comparison and stand layer index were adopted to analyze the stand spatial structure change of young-and middle-aged pure Chinese fir forest before and after interplanting broad-leaved tree species based on the measured data of six plots of pure Chinese fir forest with different age groups in Fushou Forest Farm,combining qualitative and quantitative analysis methods.Then all indexes were evaluated by using method of multiplication and division.The stand spatial structure indexes were divided into five evaluation levels.The higher the level,the more reasonable the spatial structure of the stand and the more abundant the forest layers.The results showed as follows:(1)Before interplanting broad-leaved trees species,the angle scales of young-and middle-aged stands of pure Chinese fir forest were 0.3687 and 0.3464,the mingling indexes were 0.1507 and 0.0627,the open degree of were 0.9778 and 0.4338,the neighborhood comparison were 0.4991 and 0.5225 and the stand layer indexes were 0.2495 and 0.3414,respectively.The evaluation index of stand spatial structure ranged from 0.1862 to 0.3876,with grade 1 plots number accounting for 16%and grade 2 plots accounting for 84%of the total plots number.(2)After interplanting broad-leaved trees species,the angle scales of young-and middle-aged stands of pure Chinese fir forest were 0.3289 and 0.2197,the mingling indexes were 0.3857 and 0.1629,the open degree were 1.7182 and 0.7136,the neighborhood comparison were 0.4064 and 0.4377,and the stand layer indexes were 0.3063 and 0.5123,respectively.The evaluation index of stand spatial structure ranged from 0.5921 to 0.8573,with grade 4 and grade 5 plot number accounting for 50%of the total plot number,respectivelly.The results could provide a new reference for Chinese fir pure forest interplanting

关 键 词：杉木 纯林 林分空间结构 阔叶树种 乘除法 

分 类 号：S758.53[农业科学—森林经理学]