The Difference in Light use Efficiency between an Abandoned Peatland Pasture and an Adjacent Boreal Bog in Western Newfo
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PEATLANDS
The Difference in Light use Efficiency between an Abandoned Peatland Pasture and an Adjacent Boreal Bog in Western Newfoundland, Canada Jianghua Wu 1,2,3
&
Syed Shah Mohioudin Gillani 1,2 & Mei Wang 4
Received: 20 June 2019 / Accepted: 12 September 2019 # Society of Wetland Scientists 2019
Abstract Light use efficiency (LUE) is a critical parameter to estimate the gross primary production (GPP) for terrestrial ecosystems from remotely sensed data. Only a few studies have estimated the LUE for boreal peatlands and none has calculated the LUE for a drained boreal peatland due to the limited availability of direct measurement of GPP and absorbed photosynthetically active radiation (APAR), which are required to calculate the LUE. In this study, we used eddy covariance (EC) measurement of GPP and APAR at a drained peatland pasture and an adjacent boreal bog to calculate the LUE. The pasture had a significantly higher LUE (0.034 ± 0.0109 mol mol-1) than the bog (0.028 ± 0.098 mol mol-1). The LUE showed significant year-to-year variation at the pasture, but not at the bog. The LUE variation strongly correlated with air temperature and water table depth at both sites, but did not correlate well with vapor pressure deficit. This study indicates that agricultural drainage significantly alters the LUE of boreal peatlands and that the drained peatlands need to be considered separately in LUE-based models for northern peatlands. Moreover, a longer period of study is needed to fully understand the temporal dynamics of LUE in natural peatlands. Key words Boreal bog . Peatland pasture . Light use efficiency . GPP . APAR . Environmental factors
Introduction Peatland ecosystem is one of the most efficient atmospheric carbon sinks on the planet, and it has massive implications for the feedbacks between the peatland carbon (C) cycle and the global climate system (Wu and Roulet 2014). Peat consists mainly of partially decomposed plants, such as sphagnum moss, and is found in peat-formed wetlands, such as bogs and fens (Mitsch and Gosselink 2015). Peatlands play an * Jianghua Wu [email protected] 1
Environment and Sustainability, School of Science and the Environment, Grenfell Campus, Memorial University of Newfoundland, Corner Brook, NL A2H 5G4, Canada
2
Boreal Ecosystem and Agricultural Sciences, School of Science and the Environment, Grenfell Campus, Memorial University of Newfoundland, Corner Brook, NL A2H 5G4, Canada
3
Graduate Program in Environmental Science, Memorial University of Newfoundland, St. John’s, NL A1C 5S7, Canada
4
School of Geographic Sciences, South China Normal University, Guangzhou 510631, China
important in the global C cycle and climate system due to their abilities to persistently absorb C from the atmosphere and store large amounts of organic C in the soil (Gorham 1991; Dise 2009; Lund et al. 2012). Peatlands have been an effective accumulator of C for the last 10,000 years during the Holocene (Vitt et al. 2000; Gorham et al. 2003). Carbon sequestration in peatland ecosystems occurs
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