林业科学2025，Vol.61Issue(12)：219-223,5.DOI:10.11707/j.1001-7488.LYKX20250189
森林连续清查中大径级保留木胸径测量数据偏差检验与分析
Test and Analysis of Bias in DBH Measurement Data of Large Survivor Trees in Continuous Forest Inventory
摘要
Abstract
[Objective]The aim of this study is to test whether there is any bias in the DBH measurement data of large survivor trees in continuous forest inventory,and to provide scientific basis for improving the measurement method.[Method]Based on the DBH measurement data of 2 501 large survivor trees in forest sample plots from the continuous forest inventory in Beijing from 2020 to 2024,the tree growth rate models and difference significance test method were used to test whether the difference between measured and estimated DBH growth was significant and there was bias in DBH measurement data,and the relationship between the bias size and interval length(1-8 years)was analyzed,and the data in Hebei Province was employed for verification.[Result]The results showed that there was a significant bias in the DBH measurement data of large survivor trees from the inventories in Beijing from 2020 to 2024.The total bias of measured DBH growth was 38.0%,among which the bias of 8-year interval data was 21.9%,and that of 1-year interval data was 88.7%.The DBH measurement data of large survivor trees in Hebei Province from 2020 to 2024 also confirmed that the total bias of measured DBH growth was 50.0%,and the bias of five sets of plots ranged from 32.8%to 86.6%.[Conclusion]There are positive biases in the DBH measurement data of large-diameter survivor trees in some extent,and the size of bias is highly correlated with the interval length.The shorter the interval length,the greater the bias in DBH measurement data.It is suggested to develop tree DBH growth rate models based on previous inventory data,and reasonably set the upper limit for warning according to the predicted DBH growth.For very large survivor trees over a certain size(e.g.50 cm),the predicted estimates from models can be directly used as the measured DBH.关键词
森林连续清查/大径级保留木/胸径/偏差Key words
continuous forest inventory/large survivor tree/diameter at breast height(DBH)/bias分类
农业科技引用本文复制引用
温雪香,杨学云,曾伟生..森林连续清查中大径级保留木胸径测量数据偏差检验与分析[J].林业科学,2025,61(12):219-223,5.基金项目
中央财政专项"森林资源清查与动态监测"(2130208). （2130208）
