Long-Term Monitoring of Scots Pine Litter Decomposition Rates Throughout Sweden Indicates Formation of a More Recalcitrant Litter in the South |
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Authors: | Ewa Bringmark Lage Bringmark Lars Sonesten Kristina Mjöfors Maj-Britt Johansson |
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Institution: | 1.Department of Aquatic Sciences and Assessment, SLU, P.O. Box 7050, Uppsala, 750 07 Sweden ;2.Department of Soil and Environment, SLU, P.O. Box 7082, Uppsala, 750 07 Sweden ;3.University of Gävle, Gävle, 801 76 Sweden |
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Abstract: | Decomposition studies were carried out at sites throughout Sweden, including the four Integrated Monitoring sites. Scots pine
needle litterbag weight loss measurements over 3 or 5 years were determined at 26 sites and repeated up to 27 times, depending
on the site. Humus layer respiration rates were determined for 20 sites in 1987–1989 and repeated in 2007–2008. Partial Least
Squares (PLS) regression was used to elucidate the relative importance of climatic and soil factors. Annual needle weight
losses decreased only slowly (20–10%) over 3–5 years for all northern (>60°N) sites but decreased sharply from 30 to 10% in
the third year in southern (<60°N) sites. Respiration rates of southern sites were less (40% on average) than those of northern
sites. Humus layer N was positively correlated to needle weight loss during the first and the second years, but negatively
correlated in the third year and to respiration rates. The results indicated that litter formed in southern Sweden became
more recalcitrant in later stages of decomposition compared to litter produced in northern Sweden. |
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Keywords: | Integrated monitoring Scots pine litter Annual decomposition rates Standard respiration Recalcitrant Humus quality Soil nitrogen Partial Least Squares (PLS) regression |
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