Full carbon and greenhouse gas balances of fertilized and nonfertilized reed canary grass cultivations on an abandoned peat extraction area in a dry year

Järveoja, Järvi; Peichl, Matthias; Maddison, Martin; Teemusk, Alar; Mander, Ülo

doi:10.1111/gcbb.12308

Cited by 17 publications

(17 citation statements)

References 63 publications

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“…Here R eco is modeled with an exponential temperature response curve fitted to the nighttime NEE fluxes. For LAV, R eco was directly measured with opaque chambers (Järveoja, Peichl, Maddison, Teemusk, & Mander, 2016).…”

Section: Measurements Of Net Ecosystem Co 2 Exchange and Auxiliary mentioning

confidence: 99%

Refining the role of phenology in regulating gross ecosystem productivity across European peatlands

Koebsch

Sonnentag

Järveoja

et al. 2019

Global Change Biology

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The role of plant phenology as a regulator for gross ecosystem productivity (GEP) in peatlands is empirically not well constrained. This is because proxies to track vegetation development with daily coverage at the ecosystem scale have only recently become available and the lack of such data has hampered the disentangling of biotic and abiotic effects. This study aimed at unraveling the mechanisms that regulate the seasonal variation in GEP across a network of eight European peatlands. Therefore, we described phenology with canopy greenness derived from digital repeat photography and disentangled the effects of radiation, temperature and phenology on GEP with commonality analysis and structural equation modeling. The resulting relational network could not only delineate direct effects but also accounted for possible effect combinations such as interdependencies (mediation) and interactions (moderation). We found that peatland GEP was controlled by the same mechanisms across all sites: phenology constituted a key predictor for the seasonal variation in GEP and further acted as a distinct mediator for temperature and radiation effects on GEP. In particular, the effect of air temperature on GEP was fully mediated through phenology, implying that direct temperature effects representing the thermoregulation of photosynthesis were negligible. The tight coupling between temperature, phenology and GEP applied especially to high latitude and high altitude peatlands and during phenological transition phases. Our study highlights the importance of phenological effects when evaluating the future response of peatland GEP to climate change. Climate change will affect peatland GEP especially through changing temperature patterns during plant phenologically sensitive phases in high latitude and high altitude regions.

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Section: Measurements Of Net Ecosystem Co 2 Exchange and Auxiliary mentioning

confidence: 99%

Refining the role of phenology in regulating gross ecosystem productivity across European peatlands

Koebsch

Sonnentag

Järveoja

et al. 2019

Global Change Biology

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“…This total, however, also included dark respiration of plants. Heterotrophic respiration from bare peat in a Finnish study was much lower: 1.8 Mg CO 2 ha −1 year −1 (Järveoja, Peichl, Maddison, Teemusk, & Mander, ),…”

Section: Discussionmentioning

confidence: 98%

Land use of drained peatlands: Greenhouse gas fluxes, plant production, and economics

Kasimir

Coria

et al. 2017

Global Change Biology

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Drained peatlands are hotspots for greenhouse gas (GHG) emissions, which could be mitigated by rewetting and land use change. We performed an ecological/economic analysis of rewetting drained fertile peatlands in a hemiboreal climate using different land use strategies over 80 years. Vegetation, soil processes, and total GHG emissions were modeled using the CoupModel for four scenarios: (1) business as usual-Norway spruce with average soil water table of -40 cm; (2) willow with groundwater at -20 cm; (3) reed canary grass with groundwater at -10 cm; and (4) a fully rewetted peatland. The predictions were based on previous model calibrations with several high-resolution datasets consisting of water, heat, carbon, and nitrogen cycling. Spruce growth was calibrated by tree-ring data that extended the time period covered. The GHG balance of four scenarios, including vegetation and soil, were 4.7, 7.1, 9.1, and 6.2 Mg CO eq ha year , respectively. The total soil emissions (including litter and peat respiration CO + N O + CH ) were 33.1, 19.3, 15.3, and 11.0 Mg CO eq ha year , respectively, of which the peat loss contributed 35%, 24%, and 7% of the soil emissions for the three drained scenarios, respectively. No peat was lost for the wet peatland. It was also found that draining increases vegetation growth, but not as drastically as peat respiration does. The cost-benefit analysis (CBA) is sensitive to time frame, discount rate, and carbon price. Our results indicate that the net benefit was greater with a somewhat higher soil water table and when the peatland was vegetated with willow and reed canary grass (Scenarios 2 and 3). We conclude that saving peat and avoiding methane release using fairly wet conditions can significantly reduce GHG emissions, and that this strategy should be considered for land use planning and policy-making.

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“…The GPP model including RVI as biomass proxy was previously presented by Kandel et al . () and successfully adapted in other studies (Järveoja et al ., ; Karki et al ., ). In the current study, the GPP model was extended with a temperature function (Ft) in analogy to the commonly used approach to describe the effect of low temperatures on radiation use efficiency of C 3 crops (Andersen et al ., ).…”

Section: Discussionmentioning

confidence: 99%

“…Likewise, Järveoja et al . () reported that fertilizer application in RCG cultivated on peat soil increased biomass production, gross primary production (GPP) and the ratio of autotrophic to heterotrophic respiration. In contrast, only little is known about how improved agronomical managements such as harvest frequency can improve CO 2 uptake and yield of festulolium and tall fescue and thereby improve the GHG balance of these bioenergy crops.…”

Section: Introductionmentioning

confidence: 99%

Annual balances and extended seasonal modelling of carbon fluxes from a temperate fen cropped to festulolium and tall fescue under two‐cut and three‐cut harvesting regimes

2017

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Annual balances and extended seasonal modelling of carbon fluxes from a temperate fen cropped to festulolium and tall fescue under two-cut and three-cut harvesting regimes AbstractThis study reports the annual carbon balance of a drained riparian fen under two-cut or three-cut managements of festulolium and tall fescue. CO 2 fluxes measured with closed chambers were partitioned into gross primary production (GPP) and ecosystem respiration (ER) for modelling according to environmental factors (light and temperature) and canopy reflectance (ratio vegetation index, RVI). Methodological assessments were made of (i) GPP models with or without temperature functions (Ft) to adjust GPP constraints imposed by low temperature (<10°C) and (ii) ER models with RVI or GPP parameters as biomass proxies. The sensitivity of the models was also tested on partial datasets including only alternate measurement campaigns and on datasets only from the crop growing period. Use of Ft in GPP models effectively corrected GPP overestimation in cold periods, and this approach was used throughout. Annual fluxes obtained with ER models including RVI or GPP parameters were similar, and also annual GPP and ER fluxes obtained with full and partial datasets were similar. Annual CO 2 fluxes and biomass yield were not significantly different in the crop/management combinations although the individual collars (n = 12) showed some variations in GPP (À1818 to À2409 g CO 2 -C m À2 ), ER (1071 to 1738 g CO 2 -C m À2 ), net ecosystem exchange (NEE, À669 to À949 g CO 2 -C m À2 ) and biomass yield (556 to 1044 g CO 2 -C m À2 ). Net ecosystem carbon balance (NECB), as the sum of NEE and biomass carbon export, was only slightly negative to positive in all crop/management combinations. NECBs, interpreted as emission factors, tended to favour the least biomass producing systems as the best management options in relation to climate saving carbon balances. Yet, considering the down-stream advantages of biomass for fossil fuel replacement, yieldscaled carbon fluxes are suggested to be given additional considerations for comparison of management options in terms of atmospheric impact.

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Full carbon and greenhouse gas balances of fertilized and nonfertilized reed canary grass cultivations on an abandoned peat extraction area in a dry year

Cited by 17 publications

References 63 publications

Refining the role of phenology in regulating gross ecosystem productivity across European peatlands

Refining the role of phenology in regulating gross ecosystem productivity across European peatlands

Land use of drained peatlands: Greenhouse gas fluxes, plant production, and economics

Annual balances and extended seasonal modelling of carbon fluxes from a temperate fen cropped to festulolium and tall fescue under two‐cut and three‐cut harvesting regimes

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