土壤含水量对探地雷达探测植物根系构型精度的影响

doi:10.13866/j.azr.2024.03.10

Abstract

Abstract:

Root biomass is an important part of the soil ecosystem, however, due to the limitations of measurement techniques and methods, it is impossible to rapidly assess it. The ground penetrating radar (GPR) is an efficient 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 significantly 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 detection 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 important parameters to determine variations in soil water conten during root detection; (2) the GPR’s velocity decreased 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 significance 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.

Key words: ground penetrating radar, root system, soil moisture content, non-destructive testing, loess area of western Shanxi Province

WANG Bo, ZHANG Jianjun, LAI Zongrui, ZHAO Jiongchang, HU Yawei, YANG Zhou, LI Yang, WEI Zhaoyang. Effect of soil moisture content on the accuracy of root configuration detection by ground penetrating radar[J].Arid Zone Research, 2024, 41(3): 456-466.

Figures/Tables 12

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References 39

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探测时间/年-月-日	天气	平均雷达波速/（m·ns^-1）			土壤体积含水量/%			平均土壤体含水量/%
探测时间/年-月-日	天气	0~10 cm	10~20 cm	20~30 cm	0~10 cm	10~20 cm	20~30 cm	0~30 cm
2023-02-24	晴	0.036	0.058	0.081	42.296	35.100	34.481	37.3
2023-02-27	晴	0.038	0.061	0.082	27.872	30.091	29.748	29.2
2023-03-02	多云	0.041	0.066	0.085	23.617	27.288	24.969	25.3
2023-03-05	晴	0.045	0.068	0.087	21.770	24.798	20.818	22.5
2023-03-08	多云	0.054	0.080	0.089	12.939	14.942	18.813	15.6

Effect of soil moisture content on the accuracy of root configuration detection by ground penetrating radar

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样根编号	土层深度 /cm	平均根径/cm	实际埋根数量/根	每次扫描GPR识别的根数量/根					每次扫描GPR根的识别率/%
				扫描天数/d					扫描天数/d
				1	3	6	9	12	1	3	6	9	12
1~8	10	2.0	8	1	0	2	3	4	12.5	0	25	38	50
9~16	20	2.5	8	5	7	5	8	8	62.5	87.5	62.5	100	100
17~19	30	4.5	3	1	0	2	2	3	33	0	67	67	100
合计			19	6	7	9	13	15	32	37	47	68	79

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