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Wood ash application reduced global warming potential over the five years after application in two drained peatland forests in Sweden

Konferensbidrag (offentliggjort, men ej förlagsutgivet)
Författare Ulf Sikström
Robert G. Björk
Leif Klemedtsson
Publicerad i The International Peat Congress, Stockholm, Sweden, 3-8 June 2012
Sidor abstract nr 434
Publiceringsår 2012
Publicerad vid Institutionen för biologi och miljövetenskap
Sidor abstract nr 434
Språk en
Länkar www.ipc2012.se/media/files_kongress...
Ämnesord CH4, CO2, tree growth, fertilization, N2O
Ämneskategorier Terrestrisk ekologi

Sammanfattning

Self-hardened crushed wood ash (3.3 or 6.6 tonnes dry weight ha−1) was used to fertilize two drained and forested peatland sites in southern Sweden, a Pinus sylvestris L. stand at an ombrotrophic peat site and a Picea abies (L.) Karst. stand at a minerotrophic site. The fluxes of carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) from the forest floor were monitored during the first, second and fourth and/or fifth year after application of ash. The gases were measured using static chambers (snow-free periods) and a snow concentration gradient method (periods with snow). No significant effects of wood ash application on greenhouse gas exchange were detected at the ombrothrophic site. At the minerotrophic site, the emission of CO2 and N2O from the soil was significantly reduced by both doses during the first two years after application, but not during the fourth and fifth year. Over the first eight years after fertilization, the mean annual tree-stem volume increment was significantly larger (p < 0.05) at both ash doses in the pine stand. In the spruce stand, there was a tendency to increased increment over the five-year effect period. In conclusion, application of 3–6 tonnes d.w. self-hardened crushed wood ash ha-1 rendered in reduced Global Warming Potential (GWP) over the first five years at both sites.

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