角规测树与方形样地调查结果的差异分析  

Analysis of Statistics Difference of Stand Parameters between Angle Measuring and Square Sample Plot

作　　者：周梅[1] 王新华[1] 李春干[2] 杨承伶 ZHOU Mei WANG Xinhua LI Chungan YANG Chengling(School of Computer, Electronic and Information in Guangxi University, Nanning 530004 , China Forestry College o f Guangxi University, Nanning, Nanning 530004 , China Guangxi Forest Inventory and Planning Institute, Nanning 530011, China)

机构地区：[1]广西大学计算机与电子信息学院,南宁530004 [2]广西大学林学院,南宁530004 [3]广西林业勘测设计院,南宁530011

出　　处：《林业资源管理》2017年第2期40-45,共6页Forest Resources Management

基　　金：广西壮族自治区林业勘测设计院科研业务费专项(GXLKYKJ201601)

摘　　要：利用110块临时方形样地(900 m^2)每木检尺调查和角规绕测调查资料及1 830块固定方形样地(667 m^2)每木检尺调查和角规控制检尺调查资料,以方形样地调查结果为参考,分析角规测树的断面积(G)、林分平均高(H)和每公顷蓄积量(M)的偏差并作配对t检验分析。结果表明:角规绕测G,H,M的平均偏差分别为-15.88%,5.27%和-12.16%;角规绕测G的偏差服从正态分布,但H和M的偏差不服从正态分布;角规绕测的G,H,M与方形样地每木检尺调查结果均存在显著性差异(可靠性为95%);角规控制检尺G的平均偏差为-4.59%;角规控制检尺G的偏差不服从正态分布,并与方形样地调查结果也存在着显著性差异(可靠性为95%)。角规测树偏差主要是操作不够规范、欠认真细致造成的。在森林资源调查中,需要研究和发展先进、可靠、可行的新技术新方法,如机载激光雷达。For analyzing the difference of forest stand parameters between angle measuring and tallying ofsquare plot,Two datasets were used in this paper,one was composed of 100 temporary square sample plots with the area of 900 m2 measured by tallying and point sampling with angle gauge, another was composedof 1 830 fixed square sample plots with the area of 667 m2 measured by tallying and angle gauge control registration, and then the investigation data of tallying were used as the reference to calculate the error of basal area （G） ,mean of stand height （H） and stand volume per hectare （M） of angle measuring accom-panied by the pairing t - test, the result indicated that the relative error of G,and M derived from pointsampling with angle gauge were -15. 88% ,5. 27% and -12. 16% respectively compared with the data derived from tallying,there were more than 50% of total plots,of which relative error of G and M were lar-ger than ± 20%, and more than 70% of total plots had a negative error of G and M, the error of G was subject to normal distribution,but that of and M wasnt;there was significant difference （P 〈0. 05） be-tween the mean of G,H and M derived from angle measuring and tallying of square plot; the relative error of G measured by angle gauge control registration was - 4. 90% compared to the that measured by tall-ying, there were 55. 4% of total plots that had the relative error, large than ± 20%,and 56. 9% of total plots had the negative error; the error of G wasnt subject to normal distribution, the mean of G derived from two method had significant difference （P 〈0. 05） too. All errors of angle measuring were caused by normative and unserious operation, so the quality control of investigation needs to be enhanced to reducethe data error, on the other hand, we need to develop the new technology and new methodology in large - scale forest resources inventory, such as LiDar.

关 键 词：角规绕测 角规控制检尺 每木检尺 断面积 林分平均高 每公顷蓄积量 

分 类 号：S758[农业科学—森林经理学]