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Plant and Soil

, Volume 408, Issue 1–2, pp 271–283 | Cite as

Leaf litter thickness, but not plant species, can affect root detection by ground penetrating radar

  • Toko Tanikawa
  • Hidetoshi Ikeno
  • Masako Dannoura
  • Keitarou Yamase
  • Kenji Aono
  • Yasuhiro Hirano
Regular Article

Abstract

Aim

Ground penetrating radar (GPR), a nondestructive tool that can detect coarse tree roots, has not yet become a mature technology for use in forests. In this study, we asked two questions concerning this technology: (i) Does the leaf litter layer influence root detection and major indices based on the time interval between zero crossings (T) and the amplitude area (A)? (ii) Can GPR images discriminate roots of different plant species?

Methods

Roots buried in a sandy bed, which was covered with different thicknesses of leaf litter, were scanned using a 900 MHz GPR antenna. Roots of four plant species in the bed were also scanned.

Results

Leaf litter decreased root reflections without distorting the shape of the hyperbolas in the radar profile. A values decreased with increasing litter thickness, whereas T was independent of litter thickness. For all species combined, GPR indices were significantly correlated with root diameter.

Conclusions

Leaf litter dramatically decreased root detection, but the influence of the litter could be ignored when the sum of T for all reflection waveforms (ΣT) is adopted to estimate root diameter. To use A values to detect roots, litter should be removed or equalized in thickness. Radar profiles could not reliably differentiate among roots belonging to plants of different species.

Keywords

Coarse roots Leaf litter Nondestructive root detection Phyllostachys pubescens Root diameter 

Abbreviations

A

Amplitude area

ΣA

Sum of amplitude areas for all reflection waveforms

Single Amax

Amplitude area of the maximum reflection waveform

T

Time interval between zero crossings

ΣT

Sum of time intervals for all reflection waveforms

Single Tmax

Time interval for the maximum reflection waveform

GPR

Ground penetrating radar

Notes

Acknowledgments

We thank Y. Kanazawa (Kobe University), M. Ishii and T. Igarashi (KANSO Technos), M. Hiraoka (Tokyo University of Agriculture and Technology), and S. Asano, U. Kurokawa, T. Chikaguchi, S. Narayama, M. Tanaka, Y. Shimada, N. Makita, H. Hagino, and the other members of FFPRI for their help with data analysis and the field experiments. We also thank M. Ohashi (University of Hyogo) and Y. Matsuda (Mie University) for providing comments on an early draft of this manuscript. We additionally thank three reviewers for their critical comments on an earlier draft of the manuscript. We are grateful for financial support from Grants-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan (No. 22380090, 25252027). This study was also supported by the Program for Supporting Activities for Female Researchers, which is funded by MEXT’s Special Coordination Fund for Promoting Science and Technology.

Supplementary material

11104_2016_2931_MOESM1_ESM.pptx (76 kb)
ESM 1 (PPTX 75 kb)

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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  • Toko Tanikawa
    • 1
  • Hidetoshi Ikeno
    • 2
  • Masako Dannoura
    • 3
  • Keitarou Yamase
    • 4
  • Kenji Aono
    • 5
  • Yasuhiro Hirano
    • 6
  1. 1.Kansai Research CenterForestry and Forest Products Research InstituteKyotoJapan
  2. 2.School of Human Science and EnvironmentUniversity of HyogoHyogoJapan
  3. 3.Graduate School of Global Environmental Studies, Graduate School of AgricultureKyoto UniversityKyotoJapan
  4. 4.Hyogo Prefectural Technology Center for Agriculture, Forestry and FisheriesShisoJapan
  5. 5.The General Environmental Technos Co., Ltd. (KANSO Technos)OsakaJapan
  6. 6.Graduate School of Environmental StudiesNagoya UniversityNagoyaJapan

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