Influence of hydroclimatic variations on solute concentration dynamics in nested subtropical catchments with heterogeneous landscapes - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Journal Articles Science of the Total Environment Year : 2018

Influence of hydroclimatic variations on solute concentration dynamics in nested subtropical catchments with heterogeneous landscapes

Abstract

Despite global efforts to monitor water quality in catchments worldwide, tropical and subtropical zones still lack data to study the influence of human activities and climate variations on solute dynamics. In this study, we monitored ten solutes every two weeks for six years (2010-2015) in three nested catchments (2 to 30 km(2)), which contained heterogeneous landscapes composed of forests and agricultural land, and one small neighboring forested catchment (0.4 km(2)). Data analysis revealed that i) rainfall, discharge and solute concentrations displayed no clear seasonal patterns, unlike many catchments of the temperate zone; ii) solute concentrations in the agricultural area were higher than those in the forested area, but both areas displayed similar temporal patterns due to a common hydroclimatic driver; iii) all four catchments displayed a chemostatic export regime for most of the solutes, similar to catchments of the temperate zone; and iv) a positive correlation was observed between anion concentrations and ENSO (El Nino-Southern Oscillation) index. ENSO appeared to influence both hydroclimatic and anion dynamics in these subtropical catchments. (C) 2018 Elsevier B.V. All rights reserved.
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Dates and versions

hal-02056883 , version 1 (04-03-2019)

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G. A. Piazza, Rémi Dupas, Chantal Gascuel, C. Grimaldi, A. Pinheiro, et al.. Influence of hydroclimatic variations on solute concentration dynamics in nested subtropical catchments with heterogeneous landscapes. Science of the Total Environment, 2018, 635, pp.1091-1101. ⟨10.1016/j.scitotenv.2018.03.394⟩. ⟨hal-02056883⟩
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