Sammanfattning

The present study was conducted to (i) investigate parameters influencing the fluxes of the greenhouse gas methane (CH4) in Danish riparian wetlands with contrasting vegetation characteristics and (ii) develop models relating CH4 emissions to soil and/or vegetation parameters integrating the spatial and temporal variability in the fluxes. Fluxes of CH4 were monitored in 12 wetland plots Over a year using static chambers, yielding a dataset with more than 800 measured fluxes of CH4. Yearly emissions of CH4 ranged from -0.2 to 38.3 g CH4-C m(-2) year(-1), and significant effects of groundwater level, soil temperature (10cm depth), peat depth, sulfate, nitrate, and soil carbon content were found. Two methods based on easily available environmental parameters to estimate yearly CH4 emissions from riparian wetlands are presented. The first uses a generalized linear model (GLM) to predict yearly CH4 emissions based on the humidity preference of vegetation (Ellenberg-F), peat depth and degree of humification of the peat (von Post index). The second method relies solely on plant species composition and uses weighted-average regression and calibration to link the vegetation assemblage to yearly CH4 emission. Both models gave reliable predictions of the yearly CH4 fluxes in riparian wetlands (modeling efficiency > 0.35). Our findings support the use of vegetation, possibly in combination with some soil parameters such as peat depth, as indicator of CH4 emission in wetlands. (c) 2013 Elsevier Ltd. All rights reserved.

Nyckelord

Riparian wetlands; Greenhouse gases; Methane; Modeling; Vegetation

Publicerad i

Ecological Indicators
2013, Volym: 34, sidor: 548-559
Utgivare: ELSEVIER SCIENCE BV

UKÄ forskningsämne

Oceanografi, hydrologi, vattenresurser
Klimatforskning


Publikationens identifierare

DOI: https://doi.org/10.1016/j.ecolind.2013.06.016

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/88667