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Global-change effects on early-stage decomposition processes in tidal wetlands: Implications from a global survey using standardized litter

Mueller, P., Schile-Beers, L. M., Mozdzer, T. J., Chmura, G. L., Dinter, T., Kuzyakov, Y., de Groot, A. V., Esselink, P., Smit, C., D'Alpaos, A., Ibanez, C., Lazarus, M., Neumeier, U., Johnson, B. J., Baldwin, A. H., Yarwood, S. A., Montemayor, D. I., Yang, Z., Wu, J., Jensen, K. & Nolte, S., 30-May-2018, In : Biogeosciences. 15, 10, p. 3189-3202 14 p.

Research output: Contribution to journalArticleAcademicpeer-review

  • Peter Mueller
  • Lisa M. Schile-Beers
  • Thomas J. Mozdzer
  • Gail L. Chmura
  • Thomas Dinter
  • Yakov Kuzyakov
  • Alma V. de Groot
  • Peter Esselink
  • Christian Smit
  • Andrea D'Alpaos
  • Carles Ibanez
  • Magdalena Lazarus
  • Urs Neumeier
  • Beverly J. Johnson
  • Andrew H. Baldwin
  • Stephanie A. Yarwood
  • Diana I. Montemayor
  • Zaichao Yang
  • Jihua Wu
  • Kai Jensen
  • Stefanie Nolte

Tidal wetlands, such as tidal marshes and mangroves, are hotspots for carbon sequestration. The preservation of organic matter (OM) is a critical process by which tidal wetlands exert influence over the global carbon cycle and at the same time gain elevation to keep pace with sealevel rise (SLR). The present study assessed the effects of temperature and relative sea level on the decomposition rate and stabilization of OM in tidal wetlands worldwide, utilizing commercially available standardized litter. While effects on decomposition rate per se were minor, we show strong negative effects of temperature and relative sea level on stabilization, as based on the fraction of labile, rapidly hydrolyzable OM that becomes stabilized during deployment. Across study sites, OM stabilization was 29 % lower in low, more frequently flooded vs. high, less frequently flooded zones. Stabilization declined by similar to 75% over the studied temperature gradient from 10.9 to 28.5 degrees C. Additionally, data from the Plum Island long-term ecological research site in Mas- sachusetts, USA, show a pronounced reduction in OM stabilization by > 70 % in response to simulated coastal eutrophication, confirming the potentially high sensitivity of OM stabilization to global change. We therefore provide evidence that rising temperature, accelerated SLR, and coastal eutrophication may decrease the future capacity of tidal wetlands to sequester carbon by affecting the initial transformations of recent OM inputs to soil OM.

Original languageEnglish
Pages (from-to)3189-3202
Number of pages14
JournalBiogeosciences
Volume15
Issue number10
Publication statusPublished - 30-May-2018

    Keywords

  • SEA-LEVEL RISE, SOIL ORGANIC-MATTER, SALT-MARSH, ELEVATED CO2, TEMPERATURE SENSITIVITY, SPARTINA-ALTERNIFLORA, CARBON SEQUESTRATION, NUTRIENT ENRICHMENT, COASTAL WETLANDS, ATLANTIC COAST

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