The effect of water table levels and short-term ditch restoration on mountain peatland carbon cycling in the Cordillera Blanca, Peru
Many tropical mountain peatlands in the Andes are formed by cushion plants. These unique cushion plant peatlands are intensively utilized for grazing and are also influenced by climate change, both of which alter hydrologic conditions. Little is known about the natural hydroperiods and greenhouse gas fluxes of these peatlands or the consequences of hydrologic alteration for these fluxes. Therefore, our objectives were to assess how carbon dioxide (CO2) and methane (CH4) fluxes varied across a hydrological gradient caused by ditching and evaluate how short-term carbon cycling responds after rewetting from ditch blocking in a tropical mountain peatland. The study was carried out in Huascarán National Park, Peru using static chamber methods. Comparing reference to highly drained conditions, mid-day net ecosystem exchange (NEE) was higher (1.07 ± 0.06 vs. 0.76 ± 0.11 g CO2 m−2 h−1), and the light compensation point for CO2 uptake was lower. Gas fluxes were relatively stable in the rewetted and reference treatments, with small positive responses of NEE to rising water tables. CH4 emissions averaged 2.76 ± 1.06 mg CH4 m−2 day−1, with negative fluxes at water tables >10 cm below the soil surface, and positive fluxes at higher water levels. Our results indicate that undrained peatlands appear to be carbon sinks, highly drained peatlands were likely carbon sources, and rewetting of moderately drained peatlands increased NEE and the ability to store carbon to undrained reference conditions. Ditching of peatlands will likely increase their susceptibility to negative climate change impacts, and hydrologic restoration could moderate these impacts.
KeywordsBofedales Carbon cycling Carbon dioxide Methane Andes Cushion peatlands Ditch blocking Light compensation point
This work was supported by the Sustainable Wetlands Adaptation and Mitigation Program (SWAMP) and SilvaCarbon program. We thank the staff at the Huascarán National Park (Permit No PNH-008-2012, RJ No. 11-2015-SERNANP PHN and RJ No. 13-2017-SERNANP-JEF from Servicio Nacional de Áreas Naturales Protegidas por el Estado) for all their support. We also thank the field crews for helping us collect data and Mauricio Nunez Oporto for drone imagery.
No external grant funding was used for this research.
- Amiro BD, Barr AG, Barr JG, Black TA, Bracho R, Brown M, Chen J, Clark KL, Davis KJ, Desai AR, Dore S, Engel V, Fuentes JD, Goldstein AH, Goulden ML, Kolb TE, Lavigne MB, Law BE, Margolis HA, Martin T, McCaughey JH, Misson L, Montes-Helu M, Noormets A, Randerson JT, Starr G, Xiao J (2010) Ecosystem carbon dioxide fluxes after disturbance in forests of North America. J Geophys Res 115:G00K02CrossRefGoogle Scholar
- Anderson EP, Marengo J, Villalba R, Halloy S, Young B, Cordero D, Gast F, Jaimes E, Ruiz D, Herzog SK, Martinez R (2011) Consequences of climate change for ecosystems and ecosystem services in the tropical Andes. In: Herzog SK, Martínez R, Jørgensen PM, Tiessen H eds, Climate change and biodiversity in the Tropical Andes. 2011. Inter-American Institute for Global Change Research (IAI) and Scientific Committee on Problems of the Environment (SCOPE), 348 ppGoogle Scholar
- Benavides JC (2014) The effect of drainage on organic matter accumulation and plant communities of high-altitude peatlands in the Colombian tropical Andes. Mires Peat 15:1–15Google Scholar
- Bubier JL, Gaytri B, Moore TR et al (2003) Spatial and temporal variability in growing-season net ecosystem CO2 exchange at a Large Peatland in Ontario, Canada. Ecosystems 6:353–367Google Scholar
- Carrascal DR, Maya MD, Elena M, Lagoueyte G, Jaramillo PA (2011) Increased climatic stress on high-Andean ecosystems in the Cordillera Central of Colombia (Chap. 12). In: Climate change and biodiversity in the Tropical Andes. pp 182–191Google Scholar
- Chimner RA, Karberg JM (2008) Long-term carbon accumulation in two tropical mountain peatlands, Andes Mountains, Ecuador. Mires Peat 3:1–10Google Scholar
- Clymo RS (1970) The growth of sphagnum: methods of measurement. Br Ecol Soc 58:13–49Google Scholar
- Clymo RS (1987) Peatland ecology. Sci Prog 71(593–614):593–614Google Scholar
- Cooper DJ, Chimner RA, Merritt DM (2012) Mountain Wetlands of North America. In: Batzer D, Balswin A (eds) Wetland habitats of North America: ecology and conservation concerns. University of California Press, BerkeleyGoogle Scholar
- Hribljan JA, Cooper DJ, Sueltenfuss J, Wolf E, Heckman K, Lilliskov EA, Chimner RA (2015) Carbon storage and long-term rate of accumulation in high-altitude Andean peatlands of Bolivia. Mires Peat 15:1–14Google Scholar
- Josse C, Cuesta F, Navarro G, Barrena V, Becerra MT, Cabrera E, Chacón-Moreno E, Ferreira W, Peralvo M, Saito J, Tovar A (2011) Physical geography and ecosystems in the tropical Andes. In: Herzog SK, Martinez R, Jorgensen PM, Tiessen H eds, Climate Change and Biodiversity in the Tropical Andes. Inter-American Institute for Global Change Research, Brazil, pp. 152–169Google Scholar
- Salvador F, Monerris J, Rochefort L (2014) Peatlands of the Peruvian Puna ecoregion: types, characteristics and disturbance. Mires Peat 15:1–17Google Scholar
- Sanchez M, Chimner RA, Hribljan J, Lilleskov EA, Suárez E (2017) CO2 and CH4 fluxes in grazed and undisturbed mountain peatlands in the Ecuadorian Andes. Mires Peat 19:1–18Google Scholar
- Strack M, Cagampan J, Fard GH (2016) Controls on plot-scale growing season CO2 and CH4 fluxes in restored peatlands: do they differ from highly drained and natural sites? Mires Peat 17:1–18Google Scholar
- Troll C (1968) The Cordilleras of the Tropical Americas. Aspects of climate, phytogeographical and agrarian ecology. In: Troll C (ed) Geo-ecology of the mountainous regions of the Tropical Americas. Ferd. Dummlers, Bonn, pp 15–56Google Scholar
- Vasander H, Kettunen A (2006) Carbon in boreal peatlands. In: Wieder RK, Vitt DH (eds) Boreal peatland ecosystems. Springer, BerlinGoogle Scholar