Effects of short-term drying and irrigation on CO2 and CH4 production and emission from mesocosms of a northern bog and an alpine fen

  title={Effects of short-term drying and irrigation on CO2 and CH4 production and emission from mesocosms of a northern bog and an alpine fen},
  author={Marianna Deppe and Klaus‐Holger Knorr and Diane M. McKnight and Christian Blodau},
Atmospheric CO2 and CH4 exchange in peatlands is controlled by water table levels and soil moisture, but impacts of short periods of dryness and rainfall are poorly known. We conducted drying-rewetting experiments with mesocosms from an ombrotrophic northern bog and an alpine, minerotrophic fen. Efflux of CO2 and CH4 was measured using static chambers and turnover and diffusion rates were calculated from depth profiles of gas concentrations. Due to a much lower macroporosity in the fen compared… 

Effects of extreme experimental drought and rewetting on CO2 and CH4 exchange in mesocosms of 14 European peatlands with different nitrogen and sulfur deposition

The results support the idea that N and S deposition and intense drought can substantially affect greenhouse gas exchange on the annual scale.

Controls on in situ oxygen and dissolved inorganic carbon dynamics in peats of a temperate fen

[1] Changes in hydrological conditions are expected and may alter carbon cycling in peatlands. Peat aeration with water table change has not commonly been investigated, and the water table is often

Short-Term Effects of Drying and Rewetting on CO2 and CH4 Emissions from High-Altitude Peatlands on the Tibetan Plateau

This study used mesocosms to examine the effects of alternate drying and rewetting on CO2 and CH4 emissions from high-altitude peatlands on the Tibetan Plateau. The drying and rewetting experiment

Dynamics of Nitrogen and Carbon Mineralization in a Fen Soil Following Water Table Fluctuations

Changes of water table level and oxygen supply affect the nitrogen (N) and carbon (C) mineralization of fen soils with potential consequences for the N and C sink and sources function of fens. Here

Methane emissions from natural and drained peatlands in the Zoigê, eastern Qinghai-Tibet Plateau

Peatlands are one of the major natural sources of methane (CH4), but the level of CH4 efflux is uncertain, especially in alpine peatlands. In this study, CH4 emission fluxes from natural and drained

Recovery of Methanogenesis Following Summer Drought in Soils from Two Cool Temperate Peatlands, New York State, USA

Following a summer drought, intact cores of peat soil from two cool temperate peatlands (a rain-fed bog and a groundwater-fed swamp) were exposed experimentally to three different water table levels.

Effectiveness of Ditch Blockage for Restoring Hydrologic and Soil Processes in Mountain Peatlands

Drained peatlands are a global concern due to alterations of the water and carbon cycle, loss of habitat, and increased fire frequency. However, methods for restoring drained sloping peatlands are




Projected changes in climate could shift northern peatlands from their current status as net C sinks toward that of being net C sources by changing soil temperatures and hydrology. We assessed the

Fluxes and 13 C isotopic composition of dissolved carbon and pathways of methanogenesis in a fen soil exposed to experimental drought

Abstract. Peatlands contain a carbon stock of global concern and significantly contribute to the global methane burden. The impact of drought and rewetting on carbon cycling in peatland ecosystems is

Carbon turnover in peatland mesocosms exposed to different water table levels

Changes of water table position influence carbon cycling in peatlands, but effects on the sources and sinks of carbon are difficult to isolate and quantify in field investigations due to seasonal

A multi-year perspective on methane cycling in a shallow peat fen in central New York State, USA

Minerotrophic sedge fens are common in sub-arctic regions and are a significant source of atmospheric methane (CH4), yet they have received less attention than other peatlands, such as boreal

Ecosystem Respiration in a Cool Temperate Bog Depends on Peat Temperature But Not Water Table

Ecosystem respiration (ER) is an important but poorly understood part of the carbon (C) budget of peatlands and is controlled primarily by the thermal and hydrologic regimes. To establish the

Methane Concentration and Stable Isotope Distribution as Evidence of Rhizospheric Processes: Comparison of a Fen and Bog in the Glacial Lake Agassiz Peatland Complex

This study evaluates relationships between vegetation and stable isotope distribution within a large, northern peat-accumulating wetland for two systems characterized by different plant assemblages and hydrologic regimes: a Carex -dominated fen and a Sphagnum -dominated, forested bog crest.

Effects of soil warming and drying on methane cycling in a northern peatland mesocosm study

[1] Boreal peatlands contain a large portion of the Earth's terrestrial organic carbon and may be particularly vulnerable to changes in climate. Temperatures in boreal regions are predicted to


Northern peatlands are substantial sinks of carbon (C), yet the sources of carbon dioxide (CO2) emitted from peatlands are largely unknown. Since the relationship between roots and peat in C cycling