Abstract
Peatland buffer zones with sedimentation ponds are established with the intention of capturing solids and nutrients liberated in drained forestry catchments. As noted in earlier fertilization experiments, added nitrogen (N) immediately increases nitrous oxide (N2O) emissions in such buffers, and we expected the same to happen after disturbances in the catchment caused by clear-cutting, soil preparation, and ditch cleaning. We measured N2O fluxes, water table dynamics, and vegetation cover from a wetland one year before and two years after the clear-cut and buffer establishment. The low pre-harvest emissions did not increase, but N2O emissions from the sedimentation pond exceeded those from humic lakes with a high N load. In the soil profile, N2O concentrations were high, indicating a potential to produce N2O in the buffer. In one sub-site the soil N2O concentration was below the atmospheric level, which was in accordance with the high concentrations of carbon dioxide (CO2) and methane (CH4). The change in vegetation along the overland flow paths could be explained by a shift in the species thriving in wet conditions but not in those requiring higher nutrient levels. In spite of the apparent potential of soil to produce N2O, the fluxes to the atmosphere remained low. Transformation of N2O to unobserved N2 may explain some of the low N emissions, together with the low concentrations entering the buffer.
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Acknowledgements
We warmly thank senior laboratory technicians Anita Pussinen, Seija Repo, Marja Noponen and Julia Keronen, research technicians Urho Kettunen, Markku Tiainen and Matti Naakka and many trainees and research assistants of Finnish Forest Research Institute in Joensuu Research Unit and Nurmes office. Our thanks are also due to Dr. Sirpa Piirainen for commenting the manuscript, Dr. Harri Koivusalo for his valuable comments on hydrological questions, research secretary Leena Karvinen for drawing the map and Seppo M. Heikkinen of Metsähallitus for the data on the clear-cut area and for organizing the snow plough services to the study site every winter. Rosemary Mackenzie (M.A.) revised the English language of the article. The work was funded by the Maj and Tor Nessling Foundation, the Niemi-Foundation, the Finnish Forest Research Institute and the Academy of Finland (project 214545).
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Appendix 1. List of species
Appendix 1. List of species
Ground layer:
Andromeda polifolia
Betula nana
Betula pubescens
Calluna vulgaris
Carex canescens
Carex globularis
Carex limosa
Carex magellanica
Carex pauciflora
Carex rostrata
Chamaedaphne calyculata
Deschampsia flexuosa
Drosera rotundifolia
Dryopteris carthusiana
Empetrum nigrum
Epilobium angustifolium
Eriophorum vaginatum
Linnaea borealis
Luzula pilosa
Lycopodium annotinum
Maianthemum bifolium
Melampyrum pratense
Picea abies
Pinus sylvestris
Rubus chamaemorus
Salix phylicifolia
Scheuchzeria palustris
Sorbus aucuparia
Trientalis europaea
Vaccinium microcarpum
Vaccinium myrtillys
Vaccinium oxycoccos
Vaccinium uliginosum
Vaccinium vitis-idaea
Bottom layer:
Aulacomnium palustre
Brachythecium sp.
Straminergon stramineum
Cetraria islandica
Cladina arbuscula
Digranum majus
Digranum polysetum
Dicranum scoparium
Hepaticae sp.
Hylocomium splendens
Pleurozium schreberi
Ptilium crista-castrensis
Pohlia nutans
Polytrichum commune
Polytrichum strictum
Sphagnum angustifolium
Sphagnum capillifolium
Sphagnum fuscum
Sphagnum girgensohnii
Sphagnum magellanicum
Sphagnum riparium
Sphagnum russowii
Sphagnum squarrosum
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Saari, P., Saarnio, S., Saari, V. et al. Initial effects of forestry operations on N2O and vegetation dynamics in a boreal peatland buffer. Plant Soil 330, 149–162 (2010). https://doi.org/10.1007/s11104-009-0188-6
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DOI: https://doi.org/10.1007/s11104-009-0188-6