Two Bogs in the Canadian Hudson Bay Lowlands and a Temperate Bog Reveal Similar Annual Net Ecosystem Exchange of CO₂

Abstract

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Net ecosystem exchange and energy fluxes measured with the eddy covariance technique in a western Siberian bog

“…Carbon dioxide exchange was typical of a raised bog, with net CO 2 sink being rather high (202 gC m −2 for MayAugust) but within the range of previous observations (IPCC, 2014(IPCC, , 2013. The remarkably wet weather of 2015 ensured high moisture availability and thus promoted high photosynthesis during the sunny periods.…”

“…For the period of May-July with the best data coverage, the corresponding values were −186, 91, and 277 gC m −2 . The Mukhrino May-August GPP falls between 224 and 243 gC m −2 observed over the same period by two Canadian bogs and 466-539 gC m −2 in Mer Bleue (Humphreys et al, 2014). However, in terms of net summer uptake, the Mukhrino was among the highest estimates.…”

Inter-annual variability in water table depth controls net ecosystem carbon dioxide exchange in a boreal bog

“…Previously, Humphreys et al (2014) presented 2-years of NEE for two bogs located in the Hudson Bay lowlands. There have been long-term measurements (more than 4-years) from a temperate bog (Lafleur et al 2003;Roulet et al 2007), a minerogenic fen Nilsson et al 2008;Peichl et al 2014), palsa mire (Aurela et al 2001(Aurela et al , 2002(Aurela et al , 2004, blanket bog (Sottocornola and Kiely 2010;Koehler et al 2011) and treed fen (Flanagan and Syed 2011).…”

“…found on hummocks tend to increase productivity to grow away from the water table, in an attempt to reach a preferential position relative to the water table (Belyea and Clymo 1999;Bridgham et al 2008). Humphreys et al (2014) observed a decrease in GEP in bogs in the Hudson Bay lowlands during periods where the WTD was far from surface. Similarly, Sulman et al (2010) previously showed that a temperate bog's GEP and ER increased as the WTD moved closer to the surface.…”

Spatial, Environmental, and Biotic Determinants of Zooplankton Community Composition in Subarctic Lakes and Ponds in Wapusk National Park, Canada

“…The Hudson Bay Lowlands (HBL) of central Canada comprise the second largest contiguous peatlands in the world, containing an estimated 12% of the organic carbon stored in Canadian soils (Humphreys et al, 2014). It is a region characterized by low topographic relief that is overlain with poorly drained glacial and marine silts and clays, with lakes and ponds covering an estimated 25% (Macrae et al, 2004) to >40% of the landscape (Bello and Smith, 1990).…”