Spatial variability and sampling requirements of the visual evaluation of soilstructure in cropped fields

Leopizzi, Saskia (School of Engineering, Architecture and Landscape (hepia), HES-SO // University of Applied Sciences Western Switzerland) ; Gondret, Karine (School of Engineering, Architecture and Landscape (hepia), HES-SO // University of Applied Sciences Western Switzerland) ; Boivin, Pascal (School of Engineering, Architecture and Landscape (hepia), HES-SO // University of Applied Sciences Western Switzerland)

coring the structure quality of the soil with the Visual Evaluation of the Soil Structure (VESS) spade test receivesgrowing interest due to its simplicity, reliability and the quality of the evaluation provided. Sampling require-ments to achieve a predefined quality of estimation, however, were not defined. This paper aims at filling thisknowledge gap. The spatial variability of VESS scoring is analysed in two field, one with homogeneous micro-topography and vegetation growth and one showing spots of two distinct states with respect to these criteria. Thesemi-variograms showed purely random distribution of the scores from 6–10 to > 150 m of inter distancesbetween observations, thus allowing to calculate the number of spade tests required to reach objectives ofaccuracy or minimum detectable difference. The two zones of the heterogeneous field, and the homogeneousfield, showed the same coefficient of variation of 11%, which is small. Therefore, 5 spade tests only are enoughto detect a 0.5 change of the scoring. This number is smaller than usually recommended or performed. Theclassical recommendation to sample in homogeneous vegetation growth is supported by our results. These re-sults probably apply to most situations and can be used to design monitoring protocols.


Mots-clés:
Type d'article:
scientifique
Faculté:
Ingénierie et Architecture
Ecole:
HEPIA - Haute école du paysage, d'ingénierie et d'architecture de Genève
Institut:
inTNE – institut Terre-Nature-Environnement
Classification:
Ingénierie
Date:
2018
Pagination:
5 p.
Titre du document hôte:
Geoderma
Numérotation (vol. no.):
314, pp. 58-62
DOI:
ISSN:
0016-7061
Le document apparaît dans:

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 Notice créée le 2018-06-12, modifiée le 2018-06-12

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