Articles | Volume 1, issue 1
https://doi.org/10.5194/soil-1-341-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/soil-1-341-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Amino acid and N mineralization dynamics in heathland soil after long-term warming and repetitive drought
L. C. Andresen
CORRESPONDING AUTHOR
Department of Earth Sciences, University of Gothenburg, Box 460, 405 30 Gothenburg, Sweden
current address: Department of Plant Ecology, Justus-Liebig-Universität-Gießen, Heinrich-Buff-Ring 26, 35392 Gießen, Germany
Isotope Bioscience Laboratory – ISOFYS, Ghent University, Coupure Links 653, 9000 Ghent, Belgium
A. Tietema
Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Box 94240, 1090 GE Amsterdam, the Netherlands
P. Boeckx
Isotope Bioscience Laboratory – ISOFYS, Ghent University, Coupure Links 653, 9000 Ghent, Belgium
T. Rütting
Department of Earth Sciences, University of Gothenburg, Box 460, 405 30 Gothenburg, Sweden
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Cited articles
Abuarghub, S. M. and Read, D. J.: The biology of mycorrhiza in the Ericaceae XI. The distribution of nitrogen in soil of a typical upland Callunetum with special reference to the `free' amino acids, New Phytol., 108, 425–431, 1988a.
Abuarghub, S. M. and Read, D. J.: The biology of mycorrhizae in the Ericaceae. XII Quantitative analysis of individual 'free' amino acids in relation to time and depth in the soil profile, New Phytol., 108, 433–441, 1988b.
Aerts, R., Huiszoon, A., van Oostrum, J. H. A., van De Vijver, C. A. D. M., and Willems, J. H.: The Potential for Heathland Restoration on Formerly Arable Land at a Site in Drenthe, J. Appl. Ecol., 32, 827–835, 1995.
Andresen, L. C. and Michelsen, A.: Off-season uptake of nitrogen in temperate heath vegetation, Oecologia, 144, 585–597, 2005.
Andresen, L. C., Jonasson, S., Ström, L., and Michelsen, A.: Uptake of pulse injected nitrogen by soil microbes and mycorrhizal and non-mycorrhizal plants in a species diverse subarctic heath ecosystem, Plant Soil, 313, 283–295, 2008.
Andresen, L. C., Michelsen, A., Jonasson, S., Schmidt, I. K., Mikkelsen, T. N., Ambus, P., and Beier, C.: Plant nutrient mobilization in temperate heathland responds to elevated CO2, temperature and drought, Plant Soil, 328, 381–396, 2010.
Andresen, L. C., Michelsen, A., Jonasson, S., and Ström, L.: Seasonal changes in nitrogen availability, and root and microbial uptake of 15N13C9-phenylalanine and 15N-ammonium in situ at a temperate heath, Appl. Soil Ecol., 51, 94–101, 2011.
Bai, E., Li, S., Xu, W., Li, W., Dai, W., and Jiang, P.: A meta-analysis of experimental warming effects on terrestrial nitrogen pools and dynamics, New Phytol., 199, 441–451, 2013.
Barraclough, D.: The direct or MIT route for nitrogen immobilization: a 15N mirror image study with leucine and glycine, Soil Biol. Biochem., 29, 101–108, 1997.
Beier, C., Emmett, B., Gundersen, P., Tietema, A., Peñuelas, J., Estiare, M., Gordon, C., Gorissen, A., Llorens, L., Roda, F., and Williams, D.: Novel approaches to study climate change effects on terrestrial ecosystems in the field: drought and passive night-time warming, Ecosystems, 7, 583–597, 2004.
Björsne, A. K., Rütting, T., and Ambus, P.: Combined climate factors alleviate changes in gross soil nitrogen dynamics in Heathlands, Biogeochemistry, 120, 191–201, 2014.
Chen, Y. T., Bogner, C., Borken, W., Stange, C. F., and Matzner, E.: Minor response of gross N turnover and N leaching to drying, rewetting and irrigation in the topsoil of a Norway spruce forest, Eur. J. Soil Sci., 62, 709–717, 2011.
Clemmensen, K. E., Sorensen, P. L., Michelsen, A., Jonasson, S., and Ström, L.: Site-dependent N uptake from N-form mixtures by arctic plants, soil microbes and ectomycorrhizal fungi, Oecologia, 155, 771–783, 2008.
Emmett, B. A., Beier, C., Estiarte, M., Tietema, A., Kristensen, H. L., Williams, D., Penuelas, J., Schmidt, I. K., and Sowerby, A.: The Response of Soil Processes to Climate Change: Results from Manipulation Studies of Shrublands Across an Environmental Gradient, Ecosystems, 7, 625–637, 2004.
EUR-Lex Access to European Union law: available at: http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CELEX:31992L0043:EN:NOT, last access: 13 November 2014.
Fagundez, J.: Heathlands confronting global change: drivers of biodiversity loss from past to future scenarios, Ann. Bot. London, 111, 151–172, 2013.
Farrell, M., Macdonald, L. M., Hill, P. W., Wanniarachchi, S. D., Farrar, J., Bardgett, R. D., and Jones, D. L.: Amino acid dynamics across a grassland altitudinal gradient, Soil Biol. Biochem., 72, 75–83, 2014.
Finzi, A. C. and Berthrong, S. T.: The uptake of amino acids by microbes and trees in three cold-temperate forests, Ecology, 86, 3345–3533, 2005.
García, R. R., Fraser, M. D., Celaya, R., Miguel, L., Ferreira, M., García, U., and Osoro, K.: Grazing land management and biodiversity in the Atlantic European heathlands: a review, Agroforest. Syst., 87, 19–43, 2013.
Gärdenäs, A. I., Ågren, G. I., Bird, J. A., Clarholm, M., Hallin, S., Ineson, P., Kätterer, T., Knicker, H., Nilsson, S. I., Näsholm, T., Ogle, S., Paustian, K., Persson, T., and Stendahl, J.: Knowledge gaps in soil carbon and nitrogen interactions – from molecular to global scale, Soil Biol. Biochem., 43, 702–717, 2011.
Geisseler, D., Joergensen, R. G., and Ludwig, B.: Temporal effect of straw addition on amino acid utilization by soil microorganisms, Eur. J. Soil Biol., 53, 107–113, 2012.
Gimmingham, C. H.: Ecology of Heathlands, Chapman & Hall, London, 1972.
Hadas, A., Sofer, M., Molina, J. A. E., Barak, P., and Clapp, C. E.: Assimilation of nitrogen by soil microbial population: NH4 versus organic N, Soil Biol. Biochem., 24, 137–143, 1992.
Hauck, R. D.: Nitrogen Isotope Ratio Analysis, in: Methods of soil Analysis, 2nd Edn., part 2. Agron. Monogn. 9 ASA and SSSA, Madison, WI, 1982.
IPCC Intergovernmental Panel on Climate Change Working group I contribution to the IPCC fifth assessment report (AR5), Climate Change 2013: The Physical Science Basis, 2013.
Jones, D. L. and Kielland, K.: Soil amino acid turnover dominates the nitrogen flux in permafrost-dominated taiga forest soil, Soil Biol. Biochem., 34, 209–219, 2002.
Jones, D. L. and Kielland, K.: Amino acid, peptide and protein mineralization dynamics in a taiga forest soil, Soil Biol. Biochem., 55, 60–69, 2012.
Jones, D. L., Kielland, K., Sinclair, F. L., Dahlgren, R. A., Newsham, K. K., Farrar, J. F., and Murphy, D. V.: Soil organic nitrogen mineralization across a global latitudinal gradient, Global Biogeochem. Cy., 23, GB1016, https://doi.org/10.1029/2008GB003250, 2009.
Kielland, K.: Landscape patterns of free amino acids in arctic tundra soils, Biogeochemistry, 31, 85–98, 1995.
Kirkham, D. and Bartholomew, W. V.: Equations for Following Nutrient Transformations in Soil, Utilizing Tracer Data, Soil Sci. Soc. Am. Pro., Division III Soil Microbiology, 33–34, 1954.
Knowles, T. D. J., Chadwick, D. R., Bol, R., and Evershed, R. P.: Tracing the rate and extent of N and C flow from 13C,15N-glycine and glutamate into individual de novo synthesized soil amino acids, Org. Geochem., 41, 1259–1268, 2010.
Kopittke, G. R., Tietema, A., and Verstraten, J. M.: Soil acidification occurs under ambient conditions but is retarded by repeated drought, Sci. Total Environ., 439, 332–342, 2012.
Larsen, K. S., Andresen, L. C., Beier, C., Jonasson, S., Albert, K. R., Ambus, P., Andersen, K. S., Arndal, M. F., Carter, M. S., Christensen, S., Holmstrup, M., Ibrom, A., Kongstad, J., van der Linden, L., Maraldo, K., Michelsen, A., Mikkelsen, T. N., Pilegaard, K., Priemé, A., Ro-Poulsen, H., Schmidt, I. K., and Selsted, M. B.: Reduced N cycling in response to elevated CO2, warming and drought in a Danish heathland: Synthesizing results of the CLIMAITE project after two years of treatments, Glob. Change Biol., 17, 1884–1899, 2011.
Mooshammer, M., Wanek, W., Schnecker, J., Wild, B., Leitner, S., Hofhansl, F., Blöchl, A., Hämmerle, I., Frank, A. H., Fuchslueger, L., Keiblinger, K. M., Zechmeister-Boltenstern, S., and Richter, A.: Stoichiometric controls of nitrogen and phosphorus cycling in decomposing beech leaf litter, Ecology, 93, 770–782, 2012.
Mooshammer, M., Wanek, W., Hämmerle, I., Fuchslueger, L., Hofhansl, F., Knoltsch, A., Schnecker, J., Takriti, M., Watzka, M., Wild, B., Keiblinger, K. M., Zechmeister-Boltenstern, S., and Richter, A.: Adjustment of microbial nitrogen use efficiency to carbon: nitrogen imbalances regulates soil nitrogen cycling, Nature Com., 5, e3694, https://doi.org/10.1038/ncomms4694, 2014.
Nordin, A., Schmidt, I. K., and Shaver, G. R.: Nitrogen uptake by arctic soil microbes and plants in relation to soil nitrogen supply, Ecology, 85, 955–962, 2004.
Pulleman, M. and Tietema, A.: Microbial C and N transformations during drying and rewetting of coniferous forest floor material, Soil Biol. Biochem., 31, 275–285, 1999.
Roberts, P., Stockdale, R., Khalid, M., Iqbal, Z., and Jones, D. L.: Carbon-to-nitrogen ratio is a poor predictor of low molecular weight organic nitrogen mineralization in soil, Soil Biol. Biochem., 41, 1750–1752, 2009.
Rothstein, D. E.: Effects of amino-acid chemistry and soil properties on the behavior of free amino acids in acidic forest soils, Soil Biol. Biochem., 42, 1743–1750, 2010.
Rütting, T., Huygens, D., Staelens, J., Müller, C., and Boeckx, P.: Advances in 15N tracing experiments: new labelling and data analysis approaches, Biochem. Soc. T., 39, 279–283, 2011.
Saghir, N. S., Mulvaney, R. L., and Azam, F.: Determination of nitrogen by micro diffusion in mason jars. 1. Inorganic nitrogen in soil extracts, Commun. Soil Sci. Plant Anal., 24, 1745–1762, 1993.
Sardans, J., Penuelas, J., and Estiarte, M.: Changes in soil enzymes related to C and N cycle and in soil C and N content under prolonged warming and drought in a Mediterranean shrubland, Appl. Soil Ecol., 39, 223–235, 2008.
Schimel, J. P. and Bennett, J.: Nitrogen mineralization: challenges of a changing paradigm, Ecology, 85, 591–602, 2004.
Sowerby, A., Emmett, B. A., Tietema, A., and Beier, C.: Contrasting effects of repeated summer drought on soil carbon efflux in hydric and mesic heathland soils, Glob. Change Biol., 14, 2388–2404, 2008.
Stange, F. and Döhling, F.: 15N tracing model SimKIM to analyse the NO and N2O production during autotrophic, heterotrophic nitrification, and denitrification in soils, Isoto. Environ. Health S., 41, 261–274, 2005.
von Oheimb, G., Härdtle, W., Falk, K., Gerke, A. K., Meyer, H., Drees, C., and Matern, A.: Is Calluna vulgaris a suitable bio-monitor of management-mediated nutrient pools in heathland ecosystems?, Ecol. Indic., 9, 1049–1055, 2009.
Wanek, W., Mooshammer, M., Blöchl, A., Hanreich, A., and Richter, A.: Determination of gross rates of amino acid production and immobilization in decomposing leaf litter by a novel 15N isotope pool dilution technique, Soil Biol. Biochem., 42, 1293–1302, 2010.
Watkins, N. and Barraclough, D.: Gross rates of N mineralization associated with the decomposition of plant residues, Soil Biol. Biochem., 28, 169–175, 1996.
Weintraub, M. N. and Schimel, J. P.: Seasonal protein dynamics in Alaskan arctic tundra soils, Soil Biol. Biochem., 37, 1469–1475, 2005.
Wild, B., Schnecker, J., Bárta, J., Capek, P., Guggenberger, G., Hofhansl, F., Kaiser, C., Lashchinsky, N., Mikutta, R., Mooshammer M., Santrucková, H., Shibistova, O., Urich, T., Zimov, S. A., and Richter, A.: Nitrogen dynamics in Turbic Cryosols from Siberia and Greenland, Soil Biol. Biochem., 67, 85–93, 2013.
Wilkinson, A., Hill, P. W., Farrar, J. F., Jones, D. L., and Bardgett, R. D.: Rapid microbial uptake and mineralization of amino acids and peptides along a grassland productivity gradient, Soil Biol. Biochem., 72, 75–83, 2014.
Webb, N. R.: The traditional management of European heathlands, J. Appl. Ecol., 35, 987–990, 1998.
van Meeteren, M. J. M., Tietema, A., and Westerveld, J. W.: Regulation of microbial carbon, nitrogen, and phosphorus transformations by temperature and moisture during decomposition of Calluna vulgaris litter, Biol. Fert. Soils, 44, 103–112, 2007.
Vranova, V., Rejsek, K., and Formanek, P.: Proteolytic activity in soil: A review, Appl. Soil Ecol., 70, 23–32, 2013.