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Impacts of forest conversion and agriculture practices on water pathways in Southern Brazil

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Robinet, Jérémy [KULeuven, Leuven, Belgium] Minella, Jean P. G. [Federal University of Santa Maria, Santa Maria, Brazil] de Barros, Cláudia A. P. [Universidade Federal do Rio Grande do Sul, Rio Grande do Sul, Brazil] Schlesner, Alexandre [Federal University of Santa Maria, Santa Maria, Brazil] Lücke, Andreas [Institute of Bio and Geosciences, IBG] Ameijeiras Mariño, Yolanda [UCL] Opfergelt, Sophie [UCL] Govers, Gerard [KULeuven, Leuven, Belgium]

Landuse/cover change (LUCC), and more specifically deforestation and multidecadal agriculture, is one of the various controlling factors of water fluxes at the hillslope or catchment scale. We investigated the impact of LUCC on water pathways and stream stormflow generation processes in a subtropical region in southern Brazil. We moni- tored, sampled and analysed stream water, pore water, subsurface water, and rainwa- ter for dissolved silicon concentration (DSi) and 18O/16O(δ18O) signature to identify contributing sources to the streamflow under forest and under agriculture. Both forested and agricultural catchments were highly responsive to rainfall events in terms of discharge and shallow groundwater level. DSi versus δ 18O scatter plots indicated that for both land‐use types, two run‐off components contributed to the stream discharge. The presence of a dense macropore network, combined with the presence of a compact and impeding B‐horizon, led to rapid subsurface flow in the forested catchment. In the agricultural catchment, the rapid response to rainfall was mostly due to surface run‐off. A 2‐component isotopic hydrograph separation indicated a larger contribution of rainfall water to run‐off during rainfall event in the agricultural catchments. We attributed this higher contribution to a decrease in topsoil hydraulic conductivity associated with agricultural practices. The chemical signature of the old water component in the forested catchment was very similar to that of the shallow groundwater and the pore soil water: It is therefore likely that the shallow groundwa- ter was the main source of old water. This is not the case in the agricultural catch- ments where the old water component had a much higher DSi concentration than the shallow groundwater and the soil pore water. As the agricultural catchments were larger, this may to some extent simply be a scale effect. However, the higher water yields under agriculture and the high DSi concentration observed in the old water under agriculture suggest a significant contribution of deep groundwater to catch- ment run‐off under agriculture, suggesting that LUCC may have significant effects on weathering rates and patterns

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès libre
Publication date 2018
Language Anglais
Journal information "Hydrological Processes" - Vol. 32, no.15, p. 2304-2317 (2018)
Peer reviewed yes
Publisher Wiley
issn 0885-6087
Publication status Publié
Affiliation UCL - SST/ELI/ELIE - Environmental Sciences
Keywords Water Science and Technology ; critical zone ; environmental tracers ; landuse/cover change ; subtropical environment ; water ; pathways
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Bibliographic reference Robinet, Jérémy ; Minella, Jean P. G. ; de Barros, Cláudia A. P. ; Schlesner, Alexandre ; Lücke, Andreas ; et. al. Impacts of forest conversion and agriculture practices on water pathways in Southern Brazil. In: Hydrological Processes, Vol. 32, no.15, p. 2304-2317 (2018)
Permanent URL http://hdl.handle.net/2078.1/201185