立木胸径近真值测量与计算模型的研究  

Near-true Value Measurements and Calculation Models of Diameter at Breast Height of Stand Trees

作　　者：郑似青 熊伟 方陆明 孙林豪 袁方星 郑辛煜 ZHENG Si-qing;XIONG Wei;FANG Lu-ming;SUN Lin-hao;YUAN Fang-xing;ZHENG Xin-yu(College of Information Engineering,Zhejiang A&F University,Hangzhou 311300,Zhejiang,China;Zhejiang Provincial Key Laboratory of Forestry Intelligent Monitoring and Information Technology,Hangzhou 311300,Zhejiang,China;Forestry Bureau of Longquan City,Lishui 323700,Zhejiang,China;Key Laboratory of State Forestry and Grassland Administration on Forestry Sensing Technology and Intelligent Equipment,Hangzhou 311300,Zhejiang,China)

机构地区：[1]浙江农林大学信息工程学院,浙江杭州311300 [2]浙江省林业智能监测与信息技术研究重点实验室,浙江杭州311300 [3]浙江省龙泉市林业局,浙江丽水323700 [4]国家林业与草原局林业感知技术与智能装备重点实验室,浙江杭州311300

出　　处：《西北林学院学报》2021年第5期125-132,共8页Journal of Northwest Forestry University

基　　金：浙江省科技重点研发计划资助项目(2018C02013);浙江省自然科学基金青年基金项目(LQ19D010011)。

摘　　要：立木胸径测量精准度直接影响胸高断面积、蓄积量的估算以及林地质量分析。现有测量方法都是将树干截面当作标准圆曲线来估测胸径;一些研究表明椭圆曲线或超椭圆曲线更能精准地反映树干和年轮的外形和生长情况。本研究利用自制的电子卡尺、传统围尺2种测量工具,选取8个树种,分别测量各树木的东西向、南北向、近似最大、近似最小胸径及胸高断面处的周长,并分析之间的差异性;研究了计算模型,将胸高断面分别当作标准圆、椭圆、超椭圆时与围尺测量值的接近程度以及对胸高断面积估算的影响。结果表明:1)超椭圆模型相比于标准圆、椭圆模型估算胸高断面积更加准确;2)东西向胸径比南北向胸径生长快的概率更高;3)对于卡尺,单株单次测量时选择东西方向的胸径,估算的胸高断面积更准确。The diameter at breast height(DBH) is the basic parameter for estimating the accumulation and volume of a living tree, and its accuracy directly affects the estimation of the volume.In existing measurement methods, trunk section is as a standard circular curve to estimate the DBH.Studies have shown that elliptic curves or super elliptic curve can more accurately reflect the shape and growth of tree trunks and annual rings.In this study, using self-made electronic calipers and traditional measuring devices, eight tree species were selected as the research objects, and the east-west diameter at breast height, north-south diameter at breast height, maximum diameter at breast height, minimum diameter at breast height, and perimeter at the cross-section of breast height were measured, respectively, to analyze the differences among different measurements.The calculation models were established, in which the influences of the circle forms(including standard circle, ellipse, and super ellipse, respectively) of the chest height section on the accuracy of circumference and section area were examined.The results showed that 1) compared with the standard circle and ellipse, super-ellipsewas more accurate in estimating the cross-sectional area of chest height.2) The east-west DBH was more likely to grow faster than the north-south DBH.3) For the caliper, the measurement of the breast diameter in the east-west direction was recommended for a single measurement, from which the estimated cross-sectional area of breast height was closer to the actual value.

关 键 词：胸径 森林资源清查 椭圆曲线 超椭圆曲线 胸高断面积 模型 

分 类 号：S758.1[农业科学—森林经理学]