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Mapping Mountain Peatlands and Wet Meadows Using Multi-Date, Multi-Sensor Remote Sensing in the Cordillera Blanca, Peru

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Abstract

Wetlands (called bofedales in the Andes of Peru) are abundant and important components of many mountain ecosystems across the globe. They provide many benefits including water storage, high quality habitat, pasture, nutrient sinks and transformations, and carbon storage. The remote and rugged setting of mountain wetlands creates challenges for mapping, typically leading to misclassification and underestimates of wetland extent. We used multi-date, multi-sensor radar and optical imagery (Landsat TM/PALSAR/RADARSAT-1/SRTM DEM-TPI) combined with ground truthing for mapping wetlands in Huascarán National Park, Peru. We mapped bofedales into major wetland types: 1) cushion plant peatlands, 2) cushion plant wet meadows, and 3) graminoid wet meadows with an overall accuracy of 92%. A fourth wetland type was found (graminoid peatlands) but was too rare to map accurately, thus it was combined with cushion peatland to form a single peatland class. Total wetland area mapped in the National Park is 38,444 ha, which is 11% of the park area. Peatlands were the most abundant wetland type occupying 6.3% of the park, followed by graminoid wet meadows (3.5%) and cushion wet meadows (1.3%). These maps will serve as the foundation for improved management, including restoration, and estimates of landscape carbon stocks.

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Acknowledgements

This work was supported by the Sustainable Wetlands Adaptation and Mitigation Program (SWAMP) and NSF Dynamics of Coupled Natural and Human Systems program (Award# 1617429). We thank the staff at Huascarán National Park for all their support (Permit No PNH-008-2012, RJ N°11-2015-SERNANP PHN and RJ N°13-2017-SERNANP-JEF from Servicio Nacional de Áreas Naturales Protegidas por el Estado). We also thank the field crews for helping us collect data and reviewers for improving the quality of the manuscript.

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Correspondence to Rodney A. Chimner.

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Chimner, R.A., Bourgeau-Chavez, L., Grelik, S. et al. Mapping Mountain Peatlands and Wet Meadows Using Multi-Date, Multi-Sensor Remote Sensing in the Cordillera Blanca, Peru. Wetlands 39, 1057–1067 (2019). https://doi.org/10.1007/s13157-019-01134-1

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