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Sensor mapping of amazonian dark earths in deforested croplands

Söderström, Mats and Eriksson, Jan and Isendahl, Christian and Schaan, Denise and Stenborg, Per and Rebellato, Lilian and Piikki, Kristin (2016). Sensor mapping of amazonian dark earths in deforested croplands. Geoderma. 281, 58-68
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Official URL: http://dx.doi.org/10.1016/j.geoderma.2016.06.024

Abstract

Amazonian Dark Earths (ADEs) are fertile soils for agricultural production as well as important archaeological resources for understanding the pre-Columbian past of the Neotropical lowland rainforest. ADEs are threatened by expanding land exploitation and there is a need to develop efficient approaches to soil mapping and analysis for documenting these soils. In this paper we assess the potential of satellite remote sensing and proximal soil sensing to map, predict and monitor ADEs in land affected by agro-industrial development. We use instruments based on portable x-ray fluorescence (PXRF) and electromagnetic induction (EMI) as well as high-resolution satellite data (Spot 6) for detailed soil surveys at a 10-ha ADE site now mainly used for soybean production on the Belterra Plateau, Pará, Brazil. We predict the regional occurrence of ADE in a c. 250 km 2 test area centred on the known ADE site São Francisco using satellite data. Multivariate adaptive regression splines models were parameterised for predictions of soil organic carbon (SOC), cation exchange capacity (CEC), phosphorus (P) and depth of the A horizon in ADEs from sensor data - both from individual sensors and in sensor combinations. Combining sensors gave the best validation results: the highest modelling efficiencies (E) were 0.70 (SOC), 0.88 (CEC) and 0.74 (for both P and A depth). The most powerful single proximal sensor outputs in the predictions were Sr from the PXRF data and magnetic susceptibility (MSa) as measured by the EMI instrument. In the regional satellite based model we located 17 previously unrecorded ADE sites N2 ha. Ground control checks showed that 10 out of 11 sites were correctly classified. We conclude that these sensors are useful in studies of ADE in deforested cropland and provide new opportunities for detailed studies of the archaeological record.

Authors/Creators:Söderström, Mats and Eriksson, Jan and Isendahl, Christian and Schaan, Denise and Stenborg, Per and Rebellato, Lilian and Piikki, Kristin
Title:Sensor mapping of amazonian dark earths in deforested croplands
Series/Journal:Geoderma (0016-7061)
Year of publishing :2016
Volume:281
Page range:58-68
Number of Pages:11
Publisher:Elsevier
ISSN:0016-7061
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Published version
Full Text Status:Public
Agris subject categories.:P Natural resources > P30 Soil science and management
Subjects:(A) Swedish standard research categories 2011 > 2 Engineering and Technology > 207 Environmental Engineering > Remote Sensing
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
(A) Swedish standard research categories 2011 > 6 Humanities > 601 History and Archaeology > Archaeology
Agrovoc terms:soil sciences, remote sensing, amazonas
Keywords:Terra preta, Remote sensing, Portable x-ray fluorescence, Electromagnetic induction, Soil classification, MARSplines
URN:NBN:urn:nbn:se:slu:epsilon-e-3761
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-3761
Additional ID:
Type of IDID
Web of Science (WoS)000381544000007
ID Code:13814
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
Deposited By: SLUpub Connector
Deposited On:04 Nov 2016 09:27
Metadata Last Modified:04 Nov 2016 09:27

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