Advanced search
1 file | 471.47 KB

Nitrogen deposition promotes the production of new fungal residues but retards the decomposition of old residues in forest soil fractions

(2014) GLOBAL CHANGE BIOLOGY. 20(1). p.327-340
Author
Organization
Abstract
Atmospheric nitrogen (N) deposition has frequently been observed to increase soil carbon (C) storage in forests, but the underlying mechanisms still remain unclear. Changes in microbial community composition and substrate use are hypothesized to be one of the key mechanisms affected by N inputs. Here, we investigated the effects of N deposition on amino sugars, which are used as biomarkers for fungal- and bacterial-derived microbial residues in soil. We made use of a 4-year combined CO2 enrichment and N deposition experiment in model forest ecosystems, providing a distinct C-13 signal for new' and old' C in soil organic matter and microbial residues measured in density and particle-size fractions of soils. Our hypothesis was that N deposition decreases the amount of fungal residues in soils, with the new microbial residues being more strongly affected than old residues. The soil fractionation showed that organic matter and microbial residues are mainly stabilized by association with soil minerals in the heavy and fine fractions. Moreover, the bacterial residues are relatively enriched at mineral surfaces compared to fungal residues. The C-13 tracing indicated a greater formation of fungal residues compared to bacterial residues after 4years of experiment. In contradiction to our hypotheses, N deposition significantly increased the amount of new fungal residues in bulk soil and decreased the decomposition of old microbial residues associated with soil minerals. The preservation of old microbial residues could be due to decreased N limitation of microorganisms and therefore a reduced dependence on organic N sources. This mechanism might be especially important in fine heavy fractions with low C/N ratios, where microbial residues are effectively protected from decomposition by association with soil minerals.
Keywords
biogeochemistry, compound-specific stable isotope analysis, amino sugars, ATMOSPHERIC CO2 ENRICHMENT, RATIO MASS-SPECTROMETRY, BEECH-SPRUCE ECOSYSTEMS, AMINO-SUGARS, MICROBIAL COMMUNITY, LAND-USE, STABILIZATION MECHANISMS, TEMPERATE SOILS, ORGANIC-MATTER TURNOVER, PARTICLE-SIZE FRACTIONS, soil organic matter, nitrogen deposition, soil density fractionation

Downloads

  • (...).pdf
    • full text
    • |
    • UGent only
    • |
    • PDF
    • |
    • 471.47 KB

Citation

Please use this url to cite or link to this publication:

Chicago
Griepentrog, Marco, Samuel Bodé, Pascal Boeckx, Frank Hagedorn, Alexander Heim, and Michael WI Schmidt. 2014. “Nitrogen Deposition Promotes the Production of New Fungal Residues but Retards the Decomposition of Old Residues in Forest Soil Fractions.” Global Change Biology 20 (1): 327–340.
APA
Griepentrog, M., Bodé, S., Boeckx, P., Hagedorn, F., Heim, A., & Schmidt, M. W. (2014). Nitrogen deposition promotes the production of new fungal residues but retards the decomposition of old residues in forest soil fractions. GLOBAL CHANGE BIOLOGY, 20(1), 327–340.
Vancouver
1.
Griepentrog M, Bodé S, Boeckx P, Hagedorn F, Heim A, Schmidt MW. Nitrogen deposition promotes the production of new fungal residues but retards the decomposition of old residues in forest soil fractions. GLOBAL CHANGE BIOLOGY. 2014;20(1):327–40.
MLA
Griepentrog, Marco, Samuel Bodé, Pascal Boeckx, et al. “Nitrogen Deposition Promotes the Production of New Fungal Residues but Retards the Decomposition of Old Residues in Forest Soil Fractions.” GLOBAL CHANGE BIOLOGY 20.1 (2014): 327–340. Print.
@article{4199089,
  abstract     = {Atmospheric nitrogen (N) deposition has frequently been observed to increase soil carbon (C) storage in forests, but the underlying mechanisms still remain unclear. Changes in microbial community composition and substrate use are hypothesized to be one of the key mechanisms affected by N inputs. Here, we investigated the effects of N deposition on amino sugars, which are used as biomarkers for fungal- and bacterial-derived microbial residues in soil. We made use of a 4-year combined CO2 enrichment and N deposition experiment in model forest ecosystems, providing a distinct C-13 signal for new' and old' C in soil organic matter and microbial residues measured in density and particle-size fractions of soils. Our hypothesis was that N deposition decreases the amount of fungal residues in soils, with the new microbial residues being more strongly affected than old residues. The soil fractionation showed that organic matter and microbial residues are mainly stabilized by association with soil minerals in the heavy and fine fractions. Moreover, the bacterial residues are relatively enriched at mineral surfaces compared to fungal residues. The C-13 tracing indicated a greater formation of fungal residues compared to bacterial residues after 4years of experiment. In contradiction to our hypotheses, N deposition significantly increased the amount of new fungal residues in bulk soil and decreased the decomposition of old microbial residues associated with soil minerals. The preservation of old microbial residues could be due to decreased N limitation of microorganisms and therefore a reduced dependence on organic N sources. This mechanism might be especially important in fine heavy fractions with low C/N ratios, where microbial residues are effectively protected from decomposition by association with soil minerals.},
  author       = {Griepentrog, Marco and Bod{\'e}, Samuel and Boeckx, Pascal and Hagedorn, Frank and Heim, Alexander and Schmidt, Michael WI},
  issn         = {1354-1013},
  journal      = {GLOBAL CHANGE BIOLOGY},
  keyword      = {biogeochemistry,compound-specific stable isotope analysis,amino sugars,ATMOSPHERIC CO2 ENRICHMENT,RATIO MASS-SPECTROMETRY,BEECH-SPRUCE ECOSYSTEMS,AMINO-SUGARS,MICROBIAL COMMUNITY,LAND-USE,STABILIZATION MECHANISMS,TEMPERATE SOILS,ORGANIC-MATTER TURNOVER,PARTICLE-SIZE FRACTIONS,soil organic matter,nitrogen deposition,soil density fractionation},
  language     = {eng},
  number       = {1},
  pages        = {327--340},
  title        = {Nitrogen deposition promotes the production of new fungal residues but retards the decomposition of old residues in forest soil fractions},
  url          = {http://dx.doi.org/10.1111/gcb.12374},
  volume       = {20},
  year         = {2014},
}

Altmetric
View in Altmetric
Web of Science
Times cited: