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Open AccessArticle

Soil Carbon Stock and Particle Size Fractions in the Central Amazon Predicted from Remotely Sensed Relief, Multispectral and Radar Data

1
Departamento de Solos, Instituto de Agronomia, Universidade Federal Rural do Rio de Janeiro, BR 465, km 7, Seropédica 23890-000, Brazil
2
Embrapa Solos, Rua Jardim Botânico, 1024, Rio de Janeiro 22460-000, Brazil
*
Author to whom correspondence should be addressed.
Academic Editors: José A.M. Demattê, Nicolas Baghdadi, Xiaofeng Li and Prasad S. Thenkabail
Remote Sens. 2017, 9(2), 124; https://doi.org/10.3390/rs9020124
Received: 28 October 2016 / Revised: 12 January 2017 / Accepted: 22 January 2017 / Published: 3 February 2017
(This article belongs to the Special Issue Remote Sensing Applied to Soils: From Ground to Space)
Soils from the remote areas of the Amazon Rainforest in Brazil are poorly mapped due to the presence of dense forest and lack of access routes. The use of covariates derived from multispectral and radar remote sensors allows mapping large areas and has the potential to improve the accuracy of soil attribute maps. The objectives of this study were to: (a) evaluate the addition of relief, and vegetation covariates derived from multispectral images with distinct spatial and spectral resolutions (Landsat 8 and RapidEye) and L-band radar (ALOS PALSAR) for the prediction of soil organic carbon stock (CS) and particle size fractions; and (b) evaluate the performance of four geostatistical methods to map these soil properties. Overall, the results show that, even under forest coverage, the Normalized Difference Vegetation Index (NDVI) and ALOS PALSAR backscattering coefficient improved the accuracy of CS and subsurface clay content predictions. The NDVI derived from RapidEye sensor improved the prediction of CS using isotopic cokriging, while the NDVI derived from Landsat 8 and backscattering coefficient were selected to predict clay content at the subsurface using regression kriging (RK). The relative improvement of applying cokriging and RK over ordinary kriging were lower than 10%, indicating that further analyses are necessary to connect soil proxies (vegetation and relief types) with soil attributes. View Full-Text
Keywords: digital soil mapping; geostatistics; regression kriging; cokriging digital soil mapping; geostatistics; regression kriging; cokriging
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Ceddia, M.B.; Gomes, A.S.; Vasques, G.M.; Pinheiro, É.F.M. Soil Carbon Stock and Particle Size Fractions in the Central Amazon Predicted from Remotely Sensed Relief, Multispectral and Radar Data. Remote Sens. 2017, 9, 124.

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