Whole-Ecosystem Warming Increases Plant-Available Nitrogen and Phosphorus in an Ombrotrophic Bog

Iversen, Colleen M.; Latimer, John; Brice, Deanne J.; Childs, Joanne; Stel, Holly Vander; Defrenne, Camille E.; Graham, Jake D.; Griffiths, Natalie A.; Malhotra, Avni; Norby, Richard J.; Oleheiser, Keith C.; Phillips, Jana R.; Salmon, V. G.; Sebestyen, Stephen D.; Hanson, Paul J.

doi:10.1007/s10021-022-00744-x

Cited by 22 publications

(38 citation statements)

References 104 publications

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“…Therefore, whether future peatlands become more nutrient rich depends on the balance between the positive effect of higher temperature and the negative effect of lower soil moisture. A site-level study on an ombrotrophic bog has found increased plant-available ammonium under multi-year warming treatment (Iversen et al, 2022). The negative effect of drier soil overwhelms the influence of temperature and thereby net N mineralization rate decrease under RCP 8.5 after 2100 (Supplement Fig.…”

Section: Future Productivity and Decomposition In Northern Peatlandsmentioning

confidence: 99%

Peatlands and their carbon dynamics in northern high latitudes from 1990 to 2300: a process-based biogeochemistry model analysis

Zhao

Zhuang²

2023

Biogeosciences

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Abstract. Northern peatlands have been a large C sink during the Holocene, but whether they will keep being a C sink under future climate change is uncertain. This study simulates the responses of northern peatlands to future climate until 2300 with a Peatland version Terrestrial Ecosystem Model (PTEM). The simulations are driven with two sets of CMIP5 climate data (IPSL-CM5A-LR and bcc-csm1-1) under three warming scenarios (RCPs 2.6, 4.5 and 8.5). Peatland area expansion, shrinkage, and C accumulation and decomposition are modeled. In the 21st century, northern peatlands are projected to be a C source of 1.2–13.3 Pg C under all climate scenarios except for RCP 2.6 of bcc-csm1-1 (a sink of 0.8 Pg C). During 2100–2300, northern peatlands under all scenarios are a C source under IPSL-CM5A-LR scenarios, being larger sources than bcc-csm1-1 scenarios (5.9–118.3 vs. 0.7–87.6 Pg C). C sources are attributed to (1) the peatland water table depth (WTD) becoming deeper and permafrost thaw increasing decomposition rate; (2) net primary production (NPP) not increasing much as climate warms because peat drying suppresses net N mineralization; and (3) as WTD deepens, peatlands switching from moss–herbaceous dominated to moss–woody dominated, while woody plants require more N for productivity. Under IPSL-CM5A-LR scenarios, northern peatlands remain as a C sink until the pan-Arctic annual temperature reaches −2.6 to −2.89 ∘C, while this threshold is −2.09 to −2.35 ∘C under bcc-csm1-1 scenarios. This study predicts a northern peatland sink-to-source shift in around 2050, earlier than previous estimates of after 2100, and emphasizes the vulnerability of northern peatlands to climate change.

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Section: Future Productivity and Decomposition In Northern Peatlandsmentioning

confidence: 99%

Peatlands and their carbon dynamics in northern high latitudes from 1990 to 2300: a process-based biogeochemistry model analysis

Zhao

Zhuang²

2023

Biogeosciences

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“…Yet in our study we observed decreased carbon and increased nitrogen concentrations in S. angustifolium and S. magellanicum under ambient CO 2 (Fig. 1a, b) implying increased plant-available nutrients due to warming-induced mineralization (Iversen et al, 2022) and/or enhanced accumulation of low C metabolic products (Yang et al, 2011;Sytiuk et al, 2022).…”

Section: Species-specific Response To Whole-ecosystem Warmingmentioning

confidence: 44%

“…We observed increased leaf nitrogen (Fig. 1b) in these deciduous and evergreen conifers trees, implying higher nitrogen availability due to warming-induced nutrient mineralization (Hanson et al, 2020;Iversen et al, 2022). A decline in tree productivity cannot be entirely ruled out as these species are likely to evoke conservative strategy including lowering their nitrogen use efficiency to enhance their survival (Wright et al, 2004;Zhang et al, 2020).…”

Section: Species-specific Response To Whole-ecosystem Warmingmentioning

confidence: 85%

“…This wholeecosystem study adopts a multifactor regression design and incorporates above-and below-ground warming to five warming levels (+0, +2.25, +4.5, +6.75 and +9 • C), which is broader than that used in other warming experiments, repeated at both ambient and elevated CO 2 concentrations (+500 ppm) (Hanson et al, 2017). To date, findings at SPRUCE experiment suggest that warming and associated peat drying have extended the aboveground active season (Richardson et al, 2018), increased shrub net primary productivity (McPartland et al, 2019) and decreased Sphagnum moss annual productivity (Norby et al, 2019), and increased plant-available nutrients (Iversen et al, 2022), and above-and belowground growth in shrubs (Defrenne et al, 2020;Hanson et al, 2020;Malhotra et al, 2020), and tree leaf nitrogen content (Dusenge et al, 2021). Few effects of elevated CO 2 concentration on net primary productivity and root growth (e.g., Malhotra et al, 2020) have been observed.…”

Section: Introductionmentioning

confidence: 89%

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Warming and elevated CO2 induced shifts in carbon partitioning and lipid composition within an ombrotrophic bog plant community

Ofiti¹,

Altermatt²,

Petibon³

et al. 2023

Environmental and Experimental Botany

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“…Warming greatly affects soil microbial and enzyme activity, which stimulates soil nutrient availability (Liu et al, 2015;Osanai et al, 2015;Wang et al, 2016). Warming increased nutrient mineralization, which leads to the stimulation of nutrient availability and increases nutrient assimilation by plants (Zuccarini et al, 2020;Iversen et al, 2022). In contrast, canopy warming did not significantly alter soil nutrient availability under elevated [CO 2 ] (Table 3).…”

Section: Effects Of Elevated [Co 2 ] and Canopy Warming On Soil Nutri...mentioning

confidence: 99%

Changes in plant nutrient status following combined elevated [CO2] and canopy warming in winter wheat

Wang

Lam

et al. 2023

Front. Plant Sci.

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Projected global climate change is a potential threat to nutrient utilization in agroecosystems. However, the combined effects of elevated [CO2] and canopy warming on plant nutrient concentrations and translocations are not well understood. Here we conducted an open-air field experiment to investigate the impact of factorial elevated [CO2] (up to 500 μmol mol-1) and canopy air warming (+2°C) on nutrient (N, P, and K) status during the wheat growing season in a winter wheat field. Compared to ambient conditions, soil nutrient status was generally unchanged under elevated [CO2] and canopy warming. In contrast, elevated [CO2] decreased K concentrations by 11.0% and 11.5% in plant shoot and root, respectively, but had no impact on N or P concentration. Canopy warming increased shoot N, P and K concentrations by 8.9%, 7.5% and 15.0%, but decreased root N, P, and K concentrations by 12.3%, 9.0% and 31.6%, respectively. Accordingly, canopy warming rather than elevated [CO2] increased respectively N, P and K transfer coefficients (defined as the ratio of nutrient concentrations in the shoot to root) by 22.2%, 27.9% and 84.3%, which illustrated that canopy warming played a more important role in nutrient translocation from belowground to aboveground than elevated [CO2]. These results suggested that the response of nutrient dynamics was more sensitive in plants than in soil under climate change.

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Whole-Ecosystem Warming Increases Plant-Available Nitrogen and Phosphorus in an Ombrotrophic Bog

Cited by 22 publications

References 104 publications

Peatlands and their carbon dynamics in northern high latitudes from 1990 to 2300: a process-based biogeochemistry model analysis

Peatlands and their carbon dynamics in northern high latitudes from 1990 to 2300: a process-based biogeochemistry model analysis

Warming and elevated CO2 induced shifts in carbon partitioning and lipid composition within an ombrotrophic bog plant community

Changes in plant nutrient status following combined elevated [CO2] and canopy warming in winter wheat

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