摘要
为研究柏木人工林空间结构与建立样地的最适取样尺度间的关系,以京山太子山林管局柏木人工林为研究对象,设置不同取样尺度样方,测量样方内胸径(DBH)≥5 cm的全部乔灌木的胸径、树高、空间坐标,分析林分混交度、大小比数、角尺度的均值和空间一元分布,并采用双相关函数对分布格局进行点格局分析。结果表明:随取样面积增大,林木角尺度W_(i)以随机分布为主,在W_(i)=0.5右侧分布比例减小,左侧比例增大,林分以随机分布为主;不同尺度下点格局分布与角尺度W_(i)在[0,1]区间的分布相似。取样尺度为10 m×10 m时,林木大小比数U_(i)分布状态以亚优势(U_(i)=0.25)为主;其他取样尺度时,大小比数在[0,1]分布相近。随取样面积增大,混交度M i一元分布从零度混交向强度混交逐级递减,在40 m×40 m尺度时趋于稳定。修正的平均混交度M s在30 m×30 m和40 m×40 m尺度间趋于稳定。兼顾固定样地的数据精确性与样地建设和调查较低成本,取样尺度为30 m×30 m时,柏木林分结构参数具有精确稳定特征。该尺度可作为柏木人工林多目标经营样地研究取样的最佳尺度。
In order to study the relationship between spatial structure of Cupressus funebris plantation and optimal sampling scale of sample plots,the living plants of a Cupressus funebris plantation at different sampling scales in Taizishan Forest Management Bureau of Jingshan City were selected.The diameter at breast height,tree height and spatial coordinates of all living trees and shrubs with DBH≥5 cm were surveyed.The spatial structure parameters,uniform angle,neighborhood comparison and mingling degree were analyzed with univariate distribution,and the point pattern of distribution pattern was analyzed with double correlation function.The results showed that with the increasing of sampling area,the distribution proportion on the right side decreased and the proportion on the left side of uniform angle index W_(i)increased at W_(i)=0.5,and the stand was mainly in random distribution.The distribution of point pattern at different scales was similar to that of uniform angle index W_(i)at[0,1].Where sampling scale was at 10 m×10 m,the neighborhood comparison was dominated by sub-dominance(U_(i)=0.25);for other sampling scales,the distribution of neighborhood comparison was similar at[0,1].As sampling area increased,the univariate distribution of mingling degree decreased gradually from zero degree to intensively-mixed degree,and gradually at the scale of 40 m×40 m the mingling degree tended to be stable.When the modified average mingling degree M s was between 30 m×30 m and 40 m×40 m,it tended to be stable.With data analysis accuracy for a larger fixed sample plot and the lower costs for plot establishment and surveys taken into account,when the sampling scale was at 30 m×30 m,the stand structural parameters of the Cupressus funebris plantation were accurate and stable.The scale of 30 m×30 m can be rated as the optimal scale for multi-objective management of Cupressus funebris plantations.
作者
陈益娴
孙清俊
罗海兵
汪洋
刘洪成
CHEN Yixian;SUN Qingjun;LUO Haibin;WANG Yang;LIU Hongcheng(Hubei Ecology Polytechnic College,Wuhan 430200,China;Hubei Taizishan Forest Farm Administration,Jingshan 431800,Hubei,China;Forestry Bureau of Sui County,Sui County 431500,Hubei,China;Forestry Bureau of Yunxi County,Yunxi 442699,Hubei,China)
出处
《亚热带资源与环境学报》
2022年第3期57-64,共8页
Journal of Subtropical Resources and Environment
基金
中德财政合作林业重大研究项目(zdczhz2021ky09、zdczhz2019ky01)。
关键词
柏木人工林
空间结构
取样尺度
适宜性
Cupressus funebris plantation
spatial structure
sampling scale
appropriateness
