西北农林科技大学学报（自然科学版）2026，Vol.54Issue(9)：1-13,13.DOI:10.13207/j.jnwafu.2026.09.001
基于多频探地雷达瞬时振幅的树木根系定位及影响因素研究
Tree root localization and influencing factors based on multi-frequency GPR instantaneous amplitude
摘要
Abstract
[Objective]To address the challenges in tree root detection using ground penetrating radar(GPR),such as the unclear mechanisms of multiple-factor coupling and limited localization accuracy,this study proposed a root identification and localization method based on multiple-frequency GPR instantaneous ampli-tude,enabling accurate and non-destructive detection of tree roots in complex environments.[Method]Taking triploid Populus tomentosa,a typical tree species in northern China,as the research subject,a grid scanning scheme employing multi-frequency antennas(400,900,and 1 600 MHz)was designed to acquire three-dimen-sional(3D)data of the root systems of nine-year-old trees.The high instantaneous amplitude derived from the Hilbert transform was combined with image morphological operations to precisely locate roots by calculating the weighted centroid of connected high amplitude regions.The accuracy of GPR-based root identification and loca-lization was then evaluated and validated through complete root excavation.Furthermore,under multi-frequency antenna configurations,the influencing mechanisms of root diameter,depth,and scanning angle on root identifica-tion and localization were statistically analyzed,and the quantitative relationships between root characteristics and detection performance were revealed.[Result]①Root identification using Hilbert transform and image seg-mentation was effective,with accuracy rates of 53.2％,64.0％,and 72.7％for the 400,900,and 1 600 MHz an-tennas,respectively.② Root localization using the weighted centroid of connected high instantaneous amplitude regions was accurate and feasible,with root mean square error(RMSE)in the profile length direction less than 0.12 m and in the profile depth direction less than 0.04 m for all three antenna frequencies.③ When the root dia-meter was less than 3 cm or the scanning angle was below 60°,the GPR identification accuracy improved signifi-cantly with increasing root parameters;beyond these thresholds,the detection performance stabilized.[Conclu-sion]The root identification and localization method integrating instantaneous amplitude and morphological analysis provides a feasible technical pathway for the non-destructive detection and periodic monitoring of sha-llow root systems.关键词
树木根系检测/探地雷达/根系定位/瞬时振幅/多频天线Key words
tree root detection/ground penetrating radar/root localization/instantaneous amplitude/multi-frequency antenna分类
农业科技引用本文复制引用
樊国秋,李颖航,郑一力,韩巧玲,赵燕东,梁浩..基于多频探地雷达瞬时振幅的树木根系定位及影响因素研究[J].西北农林科技大学学报（自然科学版）,2026,54(9):1-13,13.基金项目
国家自然科学基金项目(42001298) （42001298）
国家重点研发计划项目(2023YFC3006804) （2023YFC3006804）
