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rft.atitle Contrasting Effects of Substrate and Fertilizer Nitrogen on the Early Stages of Litter Decomposition
rft.epage 656
rft.genre article
rft.issn 1432-9840
1435-0629
rft.issue 6
rft.jtitle Ecosystems
rft.tpages 12
rft.pages 644-656
rft.pub Springer Science+Business Media
rft.date 2005-09-01
x.date 2005-09-01T00:00:00Z
rft.spage 644
rft.volume 8
abstract <p>Commonly observed positive correlations between litter nitrogen (N) concentrations and decomposition rates suggest that N frequently limits decomposition in its early stages. However, numerous studies have found little, if any, effect of N fertilization on decomposition. I directly compared internal substrate N and externally supplied inorganic N effects on decomposition in sites varying in soil N availability. I decomposed eight substrates (with initial %N from 0-2.5) in control and N-fertilized plots at eight grassland and forest sites in central Minnesota. N fertilization increased decomposition at only two of eight sites, even though decomposition was positively related to litter N at all sites and to soil N availability across sites. The effect of externally supplied N on decomposition was independent of litter N concentration, but was greater at sites with low N availability. The inconsistent effects of substrate and externally supplied N may have arisen because decomposers use organic N preferentially as an N source; because inorganic N availability across sites or with fertilization induced changes in microbial community attributes (for example, lower C:N or greater efficiency) that reduced the response of decomposition to increased inorganic N supply; or because the positive correlation between litter N or site N availability with decomposition was spurious, caused by tight correlations between litter or site N and some other factor that truly limited decomposition. These inconsistent effects of substrate N and external N supply on decomposition suggest that the oft-observed relationship between litter N and decomposition may not indicate N limitation of decomposition.</p>
authors Array ( [rft.aulast] => Hobbie [rft.aufirst] => Sarah E. )
languages eng
url https://www.jstor.org/stable/25053862
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author Hobbie, Sarah E.
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description <p>Commonly observed positive correlations between litter nitrogen (N) concentrations and decomposition rates suggest that N frequently limits decomposition in its early stages. However, numerous studies have found little, if any, effect of N fertilization on decomposition. I directly compared internal substrate N and externally supplied inorganic N effects on decomposition in sites varying in soil N availability. I decomposed eight substrates (with initial %N from 0-2.5) in control and N-fertilized plots at eight grassland and forest sites in central Minnesota. N fertilization increased decomposition at only two of eight sites, even though decomposition was positively related to litter N at all sites and to soil N availability across sites. The effect of externally supplied N on decomposition was independent of litter N concentration, but was greater at sites with low N availability. The inconsistent effects of substrate and externally supplied N may have arisen because decomposers use organic N preferentially as an N source; because inorganic N availability across sites or with fertilization induced changes in microbial community attributes (for example, lower C:N or greater efficiency) that reduced the response of decomposition to increased inorganic N supply; or because the positive correlation between litter N or site N availability with decomposition was spurious, caused by tight correlations between litter or site N and some other factor that truly limited decomposition. These inconsistent effects of substrate N and external N supply on decomposition suggest that the oft-observed relationship between litter N and decomposition may not indicate N limitation of decomposition.</p>
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spelling Hobbie, Sarah E. 1432-9840 1435-0629 Springer Science+Business Media https://www.jstor.org/stable/25053862 <p>Commonly observed positive correlations between litter nitrogen (N) concentrations and decomposition rates suggest that N frequently limits decomposition in its early stages. However, numerous studies have found little, if any, effect of N fertilization on decomposition. I directly compared internal substrate N and externally supplied inorganic N effects on decomposition in sites varying in soil N availability. I decomposed eight substrates (with initial %N from 0-2.5) in control and N-fertilized plots at eight grassland and forest sites in central Minnesota. N fertilization increased decomposition at only two of eight sites, even though decomposition was positively related to litter N at all sites and to soil N availability across sites. The effect of externally supplied N on decomposition was independent of litter N concentration, but was greater at sites with low N availability. The inconsistent effects of substrate and externally supplied N may have arisen because decomposers use organic N preferentially as an N source; because inorganic N availability across sites or with fertilization induced changes in microbial community attributes (for example, lower C:N or greater efficiency) that reduced the response of decomposition to increased inorganic N supply; or because the positive correlation between litter N or site N availability with decomposition was spurious, caused by tight correlations between litter or site N and some other factor that truly limited decomposition. These inconsistent effects of substrate N and external N supply on decomposition suggest that the oft-observed relationship between litter N and decomposition may not indicate N limitation of decomposition.</p> Contrasting Effects of Substrate and Fertilizer Nitrogen on the Early Stages of Litter Decomposition Ecosystems
spellingShingle Hobbie, Sarah E., Ecosystems, Contrasting Effects of Substrate and Fertilizer Nitrogen on the Early Stages of Litter Decomposition
title Contrasting Effects of Substrate and Fertilizer Nitrogen on the Early Stages of Litter Decomposition
title_full Contrasting Effects of Substrate and Fertilizer Nitrogen on the Early Stages of Litter Decomposition
title_fullStr Contrasting Effects of Substrate and Fertilizer Nitrogen on the Early Stages of Litter Decomposition
title_full_unstemmed Contrasting Effects of Substrate and Fertilizer Nitrogen on the Early Stages of Litter Decomposition
title_short Contrasting Effects of Substrate and Fertilizer Nitrogen on the Early Stages of Litter Decomposition
title_sort contrasting effects of substrate and fertilizer nitrogen on the early stages of litter decomposition
title_unstemmed Contrasting Effects of Substrate and Fertilizer Nitrogen on the Early Stages of Litter Decomposition
url https://www.jstor.org/stable/25053862