干旱区研究2024，Vol.41Issue(3)：456-466,11.DOI:10.13866/j.azr.2024.03.10
土壤含水量对探地雷达探测植物根系构型精度的影响
Effect of soil moisture content on the accuracy of root configuration detection by ground penetrating radar
摘要
Abstract
Root biomass is an important part of the soil ecosystem,however,due to the limitations of measure-ment techniques and methods,it is impossible to rapidly assess it.The ground penetrating radar(GPR)is an effi-cient and nondestructive geophysical tool through which root information can be obtained without damaging the soil environment.However,accuracy during the detection and identification of underground roots by GPR is sig-nificantly affected by many factors such as soil water content,root roughness,length,and extension direction.In particular,soil water content has an obvious effect on root detection.In this study,in situ root embedding detec-tion experiments were carried out to investigate the influence of soil water content on root detection via GPR.Combined with the changes in wave velocity,amplitude,and the root reflection coefficient of the GPR,the root point identification rate and root point distance root point root mean square error were analyzed under different average soil water content.The results showed that(1)the wave velocity and amplitude of the GPR were impor-tant parameters to determine variations in soil water conten during root detection;(2)the GPR's velocity de-creased and the radar amplitude flattened with the increasing soil water content;(3)as the root diameter increased at different soil depths,the GPR's wave velocity also increased and the GPR's amplitude tended to be drastic changes;(4)the root point recognition rate and soil water content were negatively correlated(P<0.05),and the best recognition effect was achieved when the soil water content was 15%-25%.These results are great signifi-cance for quantifying the effect of soil moisture content on the root detection accuracy of the GPR.In addition,it provide a reference for using this tool for root detection and are particularly important for the estimation of plant root biomass.关键词
探地雷达/根系/土壤含水量/无损探测/晋西黄土区Key words
ground penetrating radar/root system/soil moisture content/non-destructive testing/loess area of western Shanxi Province引用本文复制引用
王勃,张建军,赖宗锐,赵炯昌,胡亚伟,杨周,李阳,卫朝阳..土壤含水量对探地雷达探测植物根系构型精度的影响[J].干旱区研究,2024,41(3):456-466,11.基金项目
国家重点研发计划(2022YFE0104700) （2022YFE0104700）
