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Soil texture derived from topography in North-eastern Amazonia

Abstract : We present a 1:100,000 scale soil texture map of the Paragominas county (Pará, Brazil), covering 19,330 km². The method allows rapid production of a soil texture map of a large area where the strength of a duricrust controls the relief. It is based on an easily accessible explanatory variable, topography, which is represented by a Digital Elevation Model. The method makes it possible to map the spatial distribution of the texture of the topsoil layer. Modelling was complemented by field observations to identify the laws governing the spatial organisation of soil textures. The spatial variability of the elevation above sea level of the duricrust was obtained by Kriging. The error rate of the resulting map is 26%, and the observations of the four soil texture units were respectively 78%, 90%, 41% and 60% accurately located.
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François Laurent, René Poccard-Chapuis, Sophie Plassin, Gustavo Pimentel Martinez. Soil texture derived from topography in North-eastern Amazonia. Journal of Maps, Taylor & Francis, 2016, 13 (2), pp.109-115. ⟨10.1080/17445647.2016.1266524⟩. ⟨halshs-01416905⟩



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