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Combined effects of nitrogen enrichment, sulphur pollution and climate change on fen meadow vegetation N: P stoichiometry and biomass

Combined effects of nitrogen enrichment, sulphur pollution and climate change on fen meadow vegetation N: P stoichiometry and biomass
Combined effects of nitrogen enrichment, sulphur pollution and climate change on fen meadow vegetation N: P stoichiometry and biomass

Nitrogen (N) and sulphur (S) deposition, as well as altered soil moisture dynamics due to climate change can have large effects on fen meadow biogeochemistry and vegetation. Their combined effects may differ strongly from their separate effects, since each process affects different nutrients through different mechanisms. However, the impacts of these environmental problems are rarely studied in combination. We therefore investigated the separate and interactive effects of current levels of N- and S-deposition and changes in soil moisture dynamics on fen meadow vegetation. We focused on vegetation biomass and N:P stoichiometry, including access to soil P through root surface phosphatase activity, in a 3-year factorial addition experiment in an N-limited rich fen meadow in the Biebrza valley in Poland. We applied 29. 5 kg N ha-1 year-1 and 32. 1 kg S ha-1 year-1, which correspond to current deposition levels in Western Europe. Changes in soil moisture dynamics due to climate change were mimicked by amplified drying of the soil in summer. This level of N-deposition had limited effects on plant biomass production in this rich fen, despite low foliar N:P ratios that suggest N limitation. This level of S-deposition, however, resulted in decreased vegetation P-uptake and biomass. We also showed that increased summer drought resulted in considerable increases in vegetation biomass. We found no interactive effects on vegetation biomass or N:P stoichiometry, possibly as a result of the limited main effects of the separate processes.

Atmospheric deposition, Biogeochemistry, Peatland, Productivity, Soil moisture, Wetland
0168-2563
139-150
van Dijk, Jerry
f05f1de9-1157-4aea-9d15-56be79468946
Robroek, Bjorn
06dcb269-687c-41db-ab73-f61899617f92
Kardel, Ignacy
431c2fab-4efc-40b5-89fc-f0969612ca2c
Wassen, Martin
c75a4aa2-6596-44b2-8611-afa59a8229c1
van Dijk, Jerry
f05f1de9-1157-4aea-9d15-56be79468946
Robroek, Bjorn
06dcb269-687c-41db-ab73-f61899617f92
Kardel, Ignacy
431c2fab-4efc-40b5-89fc-f0969612ca2c
Wassen, Martin
c75a4aa2-6596-44b2-8611-afa59a8229c1

van Dijk, Jerry, Robroek, Bjorn, Kardel, Ignacy and Wassen, Martin (2012) Combined effects of nitrogen enrichment, sulphur pollution and climate change on fen meadow vegetation N: P stoichiometry and biomass. Biogeochemistry, 111 (1-3), 139-150. (doi:10.1007/s10533-011-9694-8).

Record type: Article

Abstract

Nitrogen (N) and sulphur (S) deposition, as well as altered soil moisture dynamics due to climate change can have large effects on fen meadow biogeochemistry and vegetation. Their combined effects may differ strongly from their separate effects, since each process affects different nutrients through different mechanisms. However, the impacts of these environmental problems are rarely studied in combination. We therefore investigated the separate and interactive effects of current levels of N- and S-deposition and changes in soil moisture dynamics on fen meadow vegetation. We focused on vegetation biomass and N:P stoichiometry, including access to soil P through root surface phosphatase activity, in a 3-year factorial addition experiment in an N-limited rich fen meadow in the Biebrza valley in Poland. We applied 29. 5 kg N ha-1 year-1 and 32. 1 kg S ha-1 year-1, which correspond to current deposition levels in Western Europe. Changes in soil moisture dynamics due to climate change were mimicked by amplified drying of the soil in summer. This level of N-deposition had limited effects on plant biomass production in this rich fen, despite low foliar N:P ratios that suggest N limitation. This level of S-deposition, however, resulted in decreased vegetation P-uptake and biomass. We also showed that increased summer drought resulted in considerable increases in vegetation biomass. We found no interactive effects on vegetation biomass or N:P stoichiometry, possibly as a result of the limited main effects of the separate processes.

Full text not available from this repository.

More information

Published date: 2012
Keywords: Atmospheric deposition, Biogeochemistry, Peatland, Productivity, Soil moisture, Wetland

Identifiers

Local EPrints ID: 413687
URI: http://eprints.soton.ac.uk/id/eprint/413687
ISSN: 0168-2563
PURE UUID: a72eff38-d424-46b5-a6e7-46627997f323
ORCID for Bjorn Robroek: ORCID iD orcid.org/0000-0002-6714-0652

Catalogue record

Date deposited: 31 Aug 2017 16:31
Last modified: 20 Jul 2019 00:27

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