R程序包ForestStatTool在林学单木和林分因子统计中的应用

Application of R program package ForestStatTool in statistics of individual tree and stand factors in forestry

【目的】为了实现林学中单木和林分指标的快速、准确计算,开发了通用的R包ForestStatTool,并通过具体示例介绍其在单木和林分因子统计计算中的应用。【方法】在R语言环境中,编写了12个实用函数,涵盖重复标签处理、重复坐标处理、样地分割、空间结构指标计算、竞争指标计算、生物多样性指标计算和林分因子统计这7大类。以北京十三陵林场的侧柏纯林0.06 hm2圆形样地和吉林省汪清林业局金沟岭林场的云冷杉针阔混交林1 hm2方形大样地的数据为例,介绍了ForestStatTool包的主要功能及使用方法。【结果】ForestStatTool包通过分析各类样地数据,成功计算了林木的空间结构、竞争指数和生物多样性等指标。结果表明:ForestStatTool包可有效识别林木的空间分布特征,量化林木的竞争压力,并揭示了林分结构和多样性分布的特征;还能够满足大样地和复杂林分的快速统计分析需求,适用于多种林业应用场景。【结论】ForestStatTool包可方便、快速、准确地完成样地数据检查与预处理,并完成林学单木和林分因子的相关统计计算。ForestStatTool包可应用于森林经理、森林培育、森林生态等领域。

[Objective]To achieve fast,accurate calculation of individual tree and stand factors in forestry,a general R program package called ForestStatTool was developed.Specific examples were provided to demonstrate its application in statistical calculation of individual tree and stand factors in forestry.[Method]In the R environment,12 practical functions were developed,covering 7 categories including duplicated labels processing,duplicated coordinates processing,plot segmentation,spatial structure index calculation,competition index calculation,biodiversity index calculation,and stand factor calculation.Using data from a 0.06 ha circular sample plot of Platycladus orientalis pure forest in Beijing’s Shisanling Forest Farm and a 1 ha square big sample plot of spruce-fir conifer-broadleaf mixed forest in the Jingouling Forest Farm,Wangqing Forestry Bureau,Jilin Province of northeastern China,the main functions and usage of ForestStatTool package were demonstrated.[Result]Through the analysis of various sample plot data using ForestStatTool package,spatial structure,competition index,biodiversity and other indicators were successfully calculated.The results indicated that the package can effectively identify tree spatial distribution characteristics,quantify tree competition pressure,and reveal stand structure and diversity features.This tool is able to quickly handle the statistical analysis of large and complex sample plots,making it suitable for various forestry applications.[Conclusion]ForestStatTool package can enable convenient,fast,accurate data checking and preprocessing,and complete the calculation of multiple individual tree and stand factors in forestry.It can be applied in the fields such as forest management,silviculture,and forest ecology.