Impacts of land use on the hydrological response of tropical Andean catchments

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Title: Impacts of land use on the hydrological response of tropical Andean catchments
Authors: Ochoa-Tocachi, B
Buytaert, W
De Bièvre, B
Célleri, R
Crespo, P
Villacís, M
Llerena, C
Acosta, L
Villazón, M
Guallpa, M
Gil-Ríos, J
Fuentes, P
Olaya, R
Viñas, P
Rojas, G
Arias, S
Item Type: Journal Article
Abstract: Changes in land use and land cover are major drivers of hydrological alteration in the tropical Andes. However, quantifying their impacts is fraught with difficulties because of the extreme diversity in meteorological boundary conditions, which contrasts strongly with the lack of knowledge about local hydrological processes. Although local studies have reduced data scarcity in certain regions, the complexity of the tropical Andes poses a big challenge to regional hydrological prediction. This study analyses data generated from a participatory monitoring network of 25 headwater catchments covering three of the major Andean biomes (páramo, jalca, and puna), and link their hydrological responses to main types of human interventions (cultivation, afforestation and grazing). A paired catchment setup was implemented to evaluate the impacts of change using a “trading space-for-time” approach. Catchments were selected based on regional representativeness and contrasting land use types. Precipitation and discharge have been monitored and analysed at high temporal resolution for a time period between 1 and 5 years. The observed catchment responses clearly reflect the extraordinarily wide spectrum of hydrological processes of the tropical Andes. They range from perennially humid páramos in Ecuador and northern Peru with extremely large specific discharge and baseflows, to highly seasonal, flashy catchments in the drier punas of southern Peru and Bolivia. The impacts of land use are similarly diverse and their magnitudes are a function of catchment properties, original and replacement vegetation, and management type. Cultivation and afforestation consistently affect the entire range of discharges, particularly low flows. The impacts of grazing are more variable, but have the largest effect on the catchment hydrological regulation. Overall, anthropogenic interventions result in increased streamflow variability and significant reductions in catchment regulation capacity and water yield, irrespective of the hydrological properties of the original biome.
Issue Date: 30-Aug-2016
Date of Acceptance: 26-Jul-2016
ISSN: 1099-1085
Publisher: Wiley
Start Page: 4074
End Page: 4089
Journal / Book Title: Hydrological Processes
Volume: 30
Issue: 22
Copyright Statement: Copyright © 2016 The Authors. Hydrological Processes. Published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited
Sponsor/Funder: Natural Environment Research Council (NERC)
Natural Environment Research Council (NERC)
Imperial College London
Natural Environment Research Council [2006-2012]
Funder's Grant Number: NE/I004017/1
IC PhD Scholarships
Keywords: hydrological response
land use
Environmental Engineering
Physical Geography And Environmental Geoscience
Civil Engineering
Publication Status: Published
Open Access location:
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering
Centre for Environmental Policy
Faculty of Natural Sciences

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