By the same authors

From the same journal

From the same journal

N deposition and elevated CO2 on methane emissions: Differential responses of indirect effects compared to direct effects through litter chemistry feedbacks

Research output: Contribution to journalArticle

Published copy (DOI)

Author(s)

  • V. A. Pancotto
  • P. M. van Bodegom
  • J. van Hal
  • R. S. P. van Logtestijn
  • P. Blokker
  • S. Toet
  • R. Aerts

Department/unit(s)

Publication details

JournalJournal of Geophysical Research
DatePublished - 2 Apr 2010
Issue number2
Volume115
Number of pages10
Pages (from-to)-
Original languageEnglish

Abstract

Increases in atmospheric CO2 concentration and N deposition are expected to affect methane (CH4) production in soils and emission to the atmosphere, directly through increased plant litter production and indirectly through changes in substrate quality. We examined how CH4 emission responded to changes in litter quality under increased N and CO2, beyond differences in CH4 resulting from changes in litter production. We used senesced leaves from C-13-labeled plants of Molinia caerulea grown at elevated and ambient CO2 and affected by N fertilization to carry out two experiments: a laboratory litter incubation and a pot experiment. N fertilization increased N and decreased C concentrations in litter whereas elevated CO2 decreased litter quality as reflected in litter C and N concentrations and in the composition of lignin and saturated fatty acids within the litter. In contrast to our expectations, CH4 production in the laboratory incubation decreased when using litter from N-fertilized plants as substrate, whereas litter from elevated CO2 had no effect, compared to controls without N and at ambient CO2. Owing to high within-treatment variability in CH4 emissions, none of the treatment effects were reflected in the pot experiment. C mineralization rates were not affected by any of the treatments. The decrease in CH4 emissions due to indirect effects of N availability through litter quality changes (described here for the first time) contrast direct effects of N fertilization on CH4 production. The complex interaction of direct effects with indirect effects of increased N on litter quality may potentially result in a net decrease in CH4 emissions from wetlands in the long term.

    Research areas

  • ATMOSPHERIC CO2, NITROGEN MINERALIZATION, DECOMPOSITION RATES, LABORATORY COLUMNS, CARBON-DIOXIDE, PEATLAND SOILS, PLANT-GROWTH, RICE PADDIES, TEMPERATURE, OXIDATION

Discover related content

Find related publications, people, projects, datasets and more using interactive charts.

View graph of relations