In situ characterization of forest litter using ground-penetrating radar

[en] Decomposing litter accumulated on the soil surface in forests plays a major role in several ecosystem processes; its detailed characterization is therefore essential for thorough understanding of ecosystem functioning. In addition, litter is known to affect remote sensing radar data over forested areas and their proper processing requires accurate quantification of litter scattering properties. In the present study, ultrawideband (0.8-2.2 GHz) ground-penetrating radar (GPR) data were collected in situ for a wide range of litter types to investigate the potential of the technique to reconstruct litter horizons in undisturbed natural conditions. Radar data were processed resorting to full-wave inversion. Good agreement was generally found between estimated and measured litter layer thicknesses, with root-mean-square error values around 1 cm for recently fallen litter (OL layer) and around 2 cm for fragmented litter in partial decomposition (OF layer) and total litter (OL + OF). Nevertheless, significant correlations between estimated and measured thicknesses were found for total litter only. Inaccuracies in the reconstruction of the individual litter horizons were mainly attributed to weak dielectric contrasts amongst litter layers, with absolute differences in relative dielectric permittivity values often lower than 2 between humus horizons, and to uncertainties in the ground truth values. Radar signal inversions also provided reliable estimates of litter electromagnetic properties, with average relative dielectric permittivity values around 2.9 and 6.3 for OL and OF litters, respectively. These results are encouraging for the use of GPR for noninvasive characterization and mapping of forest litter. Perspectives for the application of the technique in biogeosciences are discussed. © 2016. American Geophysical Union. All Rights Reserved.

Disciplines :

Phytobiology (plant sciences, forestry, mycology...)
Environmental sciences & ecology

Author, co-author :

André, F.; Earth and Life Institute, Université Catholique de Louvain, Louvain-la-Neuve, Belgium

Jonard, François ; Université de Liège - ULiège > Département de géographie > Systèmes d'information géographiques

Jonard, M.; Earth and Life Institute, Université Catholique de Louvain, Louvain-la-Neuve, Belgium

Lambot, S.; Earth and Life Institute, Université Catholique de Louvain, Louvain-la-Neuve, Belgium

Language :

English

Title :

In situ characterization of forest litter using ground-penetrating radar

Publication date :

2016

Journal title :

Journal of Geophysical Research. Biogeosciences

ISSN :

2169-8953

eISSN :

2169-8961

Publisher :

Blackwell Publishing

Volume :

121

Issue :

Pages :

879-894

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 21 September 2021

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