Water table depth, experimental warming, and reduced precipitation impact on litter decomposition in a temperate Sphagnum-peatland

Górecki, Krzysztof; Rastogi, Anshu; Stróżecki, Marcin; Gąbka, Maciej; Lamentowicz, Mariusz; Łuców, Dominika; Kayzer, Dariusz; Juszczak, Radosław

doi:10.1016/j.scitotenv.2021.145452

Cited by 41 publications

(25 citation statements)

References 71 publications

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“…Due to different water uptake mechanism, mosses and vascular plants might be affected differently. In temperate regions, OTCs have been less employed and it could be possible that the warming effect is less pronounced compared to studies from high latitude areas (Johnson et al 2013) or limited to air temperatures (Górecki et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Experimental warming increased greenhouse gas emissions of a near-natural peatland and Sphagnum farming sites

et al. 2022

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Aims Drained peatlands are a major source of greenhouse gases (GHG). Paludiculture is the production of biomass under wet and peat preserving conditions. Despite the growing recognition as GHG mitigation measure, the potential influence of climate warming on paludiculture is still unknown. Methods For two years, we quantified the exchange of carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) using manual chambers and surveyed the vegetation composition of warmed and control sites at a near-natural bog and two Sphagnum farming areas in North-Western Germany. Passive warming was achieved using Open Top Chambers (OTC). Results OTCs significantly increased air and soil temperatures, while soil moisture, humidity and light availability differed only marginally. The latter was considered when calculating gross primary production. Warming tended to increase vascular plant cover, but differences to the control plots were still small after two years. Emissions of CO2 and CH4 increased with warming, dominated by CH4 at the near-natural bog and by CO2 at the paludiculture areas, where vegetation was in a successional stage and topsoils temporarily dried out during summer. N2O emissions were negligible at the near-natural bog and ceased with increasing biomass at the paludiculture sites. Interannual variability was high due to a heatwave in the second measurement year. Conclusions Climate warming could increase GHG emissions from near-natural bogs and Sphagnum farming. In the latter case, this puts even more emphasis on water management systems ensuring high water table depths during dry periods. Further, control of vascular plants might both reduce CH4 emissions and improve biomass quality.

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Section: Introductionmentioning

confidence: 99%

Experimental warming increased greenhouse gas emissions of a near-natural peatland and Sphagnum farming sites

et al. 2022

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“…Literature on the hierarchy among the multiple potential constraints for litter decomposition tends to be site-specific. Water table depth was found to have a strong effect on the decomposition of an external litter source (tea bag method) introduced to temperate Sphagnum peatland [85]. The effectiveness of external nutrient enrichment and litter sources richer in the limiting nutrient on decomposition has been compared [86] in oligotrophic, P-limited herbaceous wetlands of northern Belize.…”

Section: Discussionmentioning

confidence: 99%

Litter Decomposition in Wet Rubber and Fruit Agroforests: Below the Threshold for Tropical Peat Formation

et al. 2022

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Peatlands are shaped by slow litter decomposition, but threshold decomposition rates that allow peat formation remain unclear. Can agroforestry in the tropics be compatible with paludiculture that allows peat formation? We explored the determinants of litter decomposition in wet agroforests adjacent to tropical peatlands in Central Kalimantan (Indonesia) by litterbag studies (up to 16 weeks) with standing litter sources to estimate rate constants, characterize litter quality (especially lignin (L), polyphenolics (Pp) and nitrogen (N)), and monitor temperature and groundwater levels. In litter transfer experiments we tested for home-field advantage (HFA) effects between land cover types. Mean residence times around 85 weeks at 27 °C were associated with a high (L + Pp)/N ratio. However, in the crossover treatments, mean residence times varied from 30 to 180 weeks and strong HFA effects (up to 80% faster decomposition at “home”) were found when litter from other sources was tested in old fruit-based agroforests. HFA indicates a local decomposer community well-adapted to its normal litter diet. Litter residence times of around two years are below the apparent peat formation threshold. Maintaining wet agroforest conditions adjacent to peat domes supports peatland rewetting and restoration but does not contribute to on-site peat formation processes.

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“…Longer and warmer growing seasons may increase interspecific competitive interactions and benefit species with high growth rates. The effect is intensified by increasing nutrient availability, promoted by a high temperature that increases decomposition rates directly (Djukic et al, 2018) and indirectly by lowering the water table if precipitation sum does not increase enough (Górecki et al, 2021; Ise et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

“…Increasing evapotranspiration decreases the water table if rainfall does not increase enough (Gong et al, 2012; Michel et al, 2020). Increasing temperature and decreasing water table accelerate nutrient cycling by increased decomposition of soil organic matter (Friberg et al, 2009; Górecki et al, 2021). A warming climate is further associated with the growing season length and growing degree day sum in Europe (Ruosteenoja et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Rising temperature modulates pH niches of fen species

Hájek

Těšitel

Tahvanainen

et al. 2021

Global Change Biology

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Rising temperatures may endanger fragile ecosystems because their character and key species show different habitat affinities under different climates. This assumption has only been tested in limited geographical scales. In fens, one of the most endangered ecosystems in Europe, broader pH niches have been reported from cold areas and are expected for colder past periods. We used the largest European-scale vegetation database from fens to test the hypothesis that pH interacts with macroclimate temperature in forming realized niches of fen moss and vascular plant species. We calibrated the data set (29,885 plots after heterogeneity-constrained resampling) with temperature, using two macroclimate variables, and with the adjusted pH, a variable combining pH and calcium richness. We modelled temperature, pH and water level niches for one hundred species best characterizing European fens using generalized additive models and tested the interaction between pH and temperature. Fifty-five fen species showed a statistically significant interaction between pH and temperature (adj p ˂ .01). Forty-six of them (84%) showed a positive interaction manifested

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Water table depth, experimental warming, and reduced precipitation impact on litter decomposition in a temperate Sphagnum-peatland

Cited by 41 publications

References 71 publications

Experimental warming increased greenhouse gas emissions of a near-natural peatland and Sphagnum farming sites

Experimental warming increased greenhouse gas emissions of a near-natural peatland and Sphagnum farming sites

Litter Decomposition in Wet Rubber and Fruit Agroforests: Below the Threshold for Tropical Peat Formation

Rising temperature modulates pH niches of fen species

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