Net Ecosystem Exchange, Gross Primary Production And Ecosystem Respiration In Ridge-Hollow Complex At Mukhrino Bog

Egor A Dyukarev,Sergey A Kurakov,Elena D Lapshina,Nina V Filippova,Evgeniy A Zarov,Ilya V Filippov,Evgeniy A Godovnikov,Dmitriy V Karpov

doi:10.24057/2071-9388-2018-77

Abstract

The continuous field measurements of net ecosystem exchange (NEE) of CO 2 were provided at ridge-hollow oligotrophic bog in the Middle Taiga zone of West Siberia, Russia in 2017-2018. The model of net ecosystem exchange of CO 2 was suggested to describe the influence of different environmental factors on NEE and to estimate the total carbon budget of the bog over the growing season. The model uses air and soil temperature, incoming photosynthetically active radiation (PAR) and water table depth, as the key factors influencing gross primary production (GPP) and ecosystem respiration (ER). The model coefficients were calibrated using the data collected by automated soil CO 2 flux system with two transparent long-term chambers placed at large hollow and small ridge sites. Experimental and modeling results showed that the Mukhrino bog acted over the study period as a carbon sink, with an average NEE of –87.7 gC m -2 at the hollow site and –50.2 gC m -2 at the ridge site. GPP was – 344.8 and –228.5 gC m -2 whereas ER was 287.6 and 140.9 gC m -2 at ridge and hollow sites, respectively. Despite of a large difference in NEE estimates between 2017 and 2018 the growing season variability of NEE were quite similar.

Highlights

Peatland ecosystems play a significant role in the global carbon cycle, being sources and sinks of greenhouse gases (GHG) (Ciais et al 2013; Rydin and Jeglum 2015)
In West Siberia peatlands occupy over 30% of the area (Terentieva et al 2016; Dyukarev et al 2011; Sheng et al 2004)
The balance between them is known as the net ecosystem exchange (NEE) of CO2 (Bubier et al 2003; Olchev et al 2009; Golovatskaya and Dyukarev 2012; Helfer et al 2015)

Summary

Introduction

Peatland ecosystems play a significant role in the global carbon cycle, being sources and sinks of greenhouse gases (GHG) (Ciais et al 2013; Rydin and Jeglum 2015). In West Siberia peatlands occupy over 30% of the area (Terentieva et al 2016; Dyukarev et al 2011; Sheng et al 2004). The other major gaseous emission of C into the atmosphere is accounts for methane (CH4), which is produced via anoxic decay of the soil organic matter (Saunois et al 2016). Peatland ecosystems in different years can serve as both a source and a sink of carbon (Golovatskaya et al 2008; Panzaoo et al 2017). The quantitative estimation of the rate of carbon exchange between peatlands and the atmosphere, as well as the revealing of environmental factors affecting carbon exchange, is an important scientific issue (Sheng et al 2004; Kabanov 2015)

Objectives

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Conclusion