依据加权Delaunays三角网的林分空间结构分析与评价  

Analysis and Evaluation of Forest Spatial Structure Using Weighted Delaunays Triangle Network

作　　者：孙宇 刘盛[1] 王诗俊 赵士博 李恩鹏 罗见 田佳歆 程福山 Sun Yu;Liu Sheng;Wang Shijun;Zhao Shibo;Li Enpeng;Luo Jian;Tian Jianxin;Cheng Fushan(Beihua University,Jilin 132013,P.R.China)

机构地区：[1]北华大学,吉林市132013

出　　处：《东北林业大学学报》2022年第8期61-68,共8页Journal of Northeast Forestry University

基　　金：吉林省重点研发项目(20200402091NC);吉林省教育厅“十三五”科学技术项目(JJKH20200053KJ)。

摘　　要：在露水河林业局东升林场的长白落叶松人工林内设置了20块面积为0.06 hm^(2)的落叶松人工林样地,将林木胸径、树高、冠幅加权到Delaunays三角网中以修正对象木与竞争木之间的竞争关系。基于加权三角网计算了角尺度、大小比数、密集度、开敞度、竞争指数、混交度这6个林分空间结构参数,构建了林分空间结构评价方法,并以此作为林分经营迫切性评价的指标。结果表明:(1)加权Delaunays三角网可以显著修正对象木与竞争木之间的竞争关系。20块落叶松人工林样地在加权后,林分竞争单元中平均排除了1.36株和增加了1.37株竞争木。(2)加权前后的角尺度、大小比数、密集度、开敞度、竞争指数、混交度这6个林分空间结构参数的统计学意义没有变化,均符合正态分布,其中角尺度加权前后的计算数据不具有相关性,其他5个参数均相关显著。(3)以加权Delaunays三角网计算的6个林分空间结构参数为基础,构建了林分空间结构评价方法,从林分空间结构的角度,考虑现实林分与理想林分的差距,能全面地对林分整体竞争状态给出评价。结论:加权Delaunays三角网可以显著修正对象木与竞争木之间的竞争关系,以此为基础构建的林分空间竞争评价方法能够客观准确的反映林分整体竞争状态,可以作为林分经营迫切性的评价指标。We set up 20 Larixolgensis plantation plots of 0.06 hm^(2) in Dongsheng Forest Farm of Lushuihe Forestry Bureau. The DBH, height and crown width of trees were weighted into Delaunays triangle network to corrected the competition between objective trees and competitive trees. By using the weighted triangulation network, six stand spatial structure parameters including the uniform angle index, dominance, crowding, stand open degree, competition index and mingling degree, were analyzed, and the evaluation method of stand spatial structure was constructed, which was used as an index to evaluated the urgency of stand management. Results:(1)Weighted Delaunays triangle network significantly corrected the competition between objective trees and competitive trees. After the weighting of 20 larch plantations, 1.36 competitive trees were excluded and 1.37 competitive trees were increased in the stand competition unit.(2)The six stand spatial structure parameters before and after weighting, uniform angle index, dominance, crowding, stand open degree, all accord with normal distribution, in which the calculated data before and after angular scale weighting have no correlation, but the other five parameters have significant correlation.(3)With the six stand spatial structure parameters calculated by weighted Delaunays triangulation network, we established an evaluation method of theforestspatialstructure. This method considers the gap between realistic stand and ideal stand from the perspective of stand spatial structure, which can comprehensively evaluate the overall competitive state of stand. Therefore, the weighted Delaunays triangle network can significantly corrected the competition between objective trees and competitive trees. The evaluation method of stand spatial competition can objectively and accurately reflected the overall competition state of stand, which could be used as the evaluation index of management urgency index.

关 键 词：经营迫切性评价指数 人工林 加权三角网 林分空间结构 逻辑坐标 

分 类 号：S753.7[农业科学—森林经理学]