NDLI: Calibrating the impact of root orientation on root quantification using ground-penetrating radar

Content Provider	Springer Nature Link
Author	Guo, Li Wu, Yuan Chen, Jin Hira, Yasuhiro Tanikawa, Toko Li, Wentao Cui, Xihong
Copyright Year	2015
Abstract	Ground-penetrating radar (GPR) has provided a non-invasive means for field root investigation. However, the horizontal cross angle (x) of root orientation intersecting a survey line considerably impacts the amplitude area (A) reflected from a root and impairs the accuracy of GPR-based root quantification. Prediction of A(90°) (the value of A scanning at x = 90°) from multiple A(x) measurements could correct such impact. Previous method of A(90°) prediction focused on target roots at field point scale. The aim of this study is to develop a method to predict A(90°) at field plot scale. A(90°) was predicted by a pair of A(x) measured at two arbitrary scanning lines together with an estimated soil background amplitude area. Three independent datasets were employed to test the proposed method. The field experiment included radar data collected for six roots of Caragana microphylla in a sandy-clay soil at four cross angles (30°, 45°, 60°, and 90°). The sand box experiment included radar data for 12 dowels at 13 cross angles (0° to 180°, in 15° steps). The simulation experiment included A(x) of 46 simulated roots at 13 cross angles (0° to 180°, in 15° steps).For all experiments, A(90°) was accurately estimated. Root orientation could also be determined. After correcting the impact of cross angle, the accuracy of root diameter estimation improved. Correlation coefficient between actual and estimated root diameters increased from 0.77 to 0.81, with RMSE declining from 9.53 to 7.05 mm.A method of correcting the influence of root orientation on root GPR signal at the field plot scale has been established. This method enhances root quantification using GPR.
Starting Page	289
Ending Page	305
Page Count	17
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	395
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Springer International Publishing
Publisher Date	2015-06-25
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Coarse root Field plot scale Nondestructive root method Root angle Root diameter Root biomass Plant Sciences Soil Science & Conservation Plant Physiology Ecology
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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Calibrating the impact of root orientation on root quantification using ground-penetrating radar

Comment on: “root orientation can affect detection accuracy of ground-penetrating radar”

Root orientation can affect detection accuracy of ground-penetrating radar

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Calibrating the impact of root orientation on root quantification using ground-penetrating radar

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Calibrating the impact of root orientation on root quantification using ground-penetrating radar

Comment on: “root orientation can affect detection accuracy of ground-penetrating radar”

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