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• W2142247108 abstract "Abstract A conceptual model of water and solute transport pathways was developed and applied to a pasture hillslope in the southwestern Brazilian Amazon basin using select field measurements. Infiltration‐excess or Horton overland flow (HOF), saturation overland flow (SOF), and groundwater in both the near‐stream zone and upslope were sampled on a hillslope draining a 3·9 hectare pasture for a total of ten storms during the first half of the rainy season (October–November) in 2002. A Soil Conservation Service SCS curve number model of HOF and an annual water balance of both upslope and near‐stream zones were used to calculate the contribution of each flowpath to solute export. HOF occurred in rainstorms greater than 5 mm and accounted for ∼8% of annual rainfall. Flow generated in the near‐stream zone was ∼8% of annual rainfall. Sub‐surface flow from upslope groundwater dominated annual runoff (∼19–30% of annual rainfall). Solutes fell into three categories according to flowpath. HOF from upslope positions dominated the export of total phosphorus (TP) and total dissolved phosphorus (TDP, 51–72% of total annual export). The near‐stream zones controlled the export of K (58–65%), total dissolved nitrogen (TDN, 76–80%), and total nitrogen (TN, ∼75%) owing to relatively high solute concentrations and the large volume of water that flowed through the near‐stream zone. Na and Si export was via groundwater from upslope (50–67% of annual export). The flux calculations were based on a small number of storms and are preliminary estimates designed to identify broad patterns in solute export via different hydrologic pathways. Additional processes, especially N removal at the groundwater‐stream interface and in the stream channel, may affect actual export rates at the watershed scale. Whereas HOF production is negligible in Amazon forests, it represents a significant pathway for additional loss of elements, especially phosphorus, from mature pasture systems. The evidence presented here shows that biogeochemical perturbations and enhanced solute fluxes continue for decades following deforestation for pasture. Copyright © 2006 John Wiley & Sons, Ltd." @default.
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• W2142247108 date "2006-07-24" @default.
• W2142247108 modified "2023-09-26" @default.
• W2142247108 title "Transport of water, solutes and nutrients from a pasture hillslope, southwestern Brazilian Amazon" @default.
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• W2142247108 doi "https://doi.org/10.1002/hyp.6214" @default.
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