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www.biogeosciences-discuss.net/4/1633/2007/
doi:10.5194/bgd-4-1633-2007
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CO2 exchange and Carbon balance in two grassland sites on eutrophic drained peat soils
1Nature Conservation and Plant Ecology group, Wageningen University, Droevendaalse steeg 3a 6708 PD Wageningen, The Netherlands
2Max Planck institute for Biogeochemistry, Hans Knöll Straße 10D–7745, Jena, Germany
3Department of Plant Production Systems, Wageningen University, P.O. Box 430, 6700 AK Wageningen, The Netherlands
4Free University, Department of Hydrology and Geo-Environmental Sciences, Faculty of Earth and Life Sciences, Boelelaan 1085, 1081 HV Amsterdam, The Netherlands
Abstract. In this study we investigated the role of intensive and extensive dairy farm practices on CO2 exchange and the carbon balance of peatlands by means of eddy covariance (EC) measurements. Year long EC measurements were made in two adjacent farm sites on peat soil in the western part of the Netherlands. One site (Stein) is a new meadow bird reserve and is managed predominantly by mowing in June and August. The second site (Oukoop) is an intensive dairy farm.
Minimum ecosystem flux of the grass sward (range −2 to −34 μmol CO2 m−2 s−1) showed a close and similar linear relationship with Leaf Area Index (LAI; range 1 to 5) except in maturing hay meadows, where minimum ecosystem flux did not decrease further. Apparent quantum yield varied between −0.02 and −0.08 (mean −0.045) μmol CO2 μmol−1 photons at both sites and was significantly correlated with LAI during the growth season. Ecosystem Respiration at 10°C (R10) calculated from the year round data set was 3.47 μmol CO2 m−2 s−1 at Stein and 3.64 μmol CO2 m−2 s−1 at Oukoop.
Both sites were a source of carbon in winter and a sink during summer, with net ecosystem exchange varying between 50 to 100 mmol CO2m−2 d−1 in winter to below −400 mmol CO2 m−2 d−1 in summer. Periodically both sites became a source after mowing. Net annual ecosystem exchange (NEE) for Stein was −8.4 g C m−2 a−1 and for Oukoop 122.4 g C m−2 a−1, the difference between the sites was mainly due a difference in GEP (101 g C m−2 a−1). However when biomass removal, manure applications and estimates of methane emissions are taken into account, both eutrophic peat meadows are a strong source for C ((462 g C m−2 a−1 and 465 g C m−2 a−1 at Stein and Oukoop, respectively).
Discussion Paper (PDF, 1549 KB) Interactive Discussion (Closed, 4 Comments) Final Revised Paper (BG) Special Issue
Notice on Discussion StatusCitation: Veenendaal, E. M., Kolle, O., Leffelaar, P. A., Schrier-Uijl, A. P., Van Huissteden, J., Van Walsem, J., Möller, F., and Berendse, F.: CO2 exchange and Carbon balance in two grassland sites on eutrophic drained peat soils, Biogeosciences Discuss., 4, 1633-1671, doi:10.5194/bgd-4-1633-2007, 2007. Bibtex EndNote Reference Manager XML
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