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  • 1
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    Geochemistry of Mannikjarve bog (KOE:ACCROTELM/EST) peat core from Estonia (2021)
    PANGAEA
    Details
    Publication Date: 2023-12-12
    Description: Geochemistry data of a high-resolution peat core from the Past Global Changes - Carbon in Peat on EArth through Time (PAGES_C-PEAT) Project.
    Keywords: Carbon, total; Carbon/nitrogen analyser; Comment; C-PEAT; Density, dry bulk; DEPTH, sediment/rock; Estonia; KOE: ACCROTELM / EST; Mannikjarve_Bog; Nitrogen, total; PAGES_C-PEAT; Past Global Changes - Carbon in Peat on EArth through Time; PEATC; Peat corer; Peatland; Sample thickness; Sample volume
    Type: Dataset
    Format: text/tab-separated-values, 950 data points
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  • 2
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    Calibrated ages of Mannikjarve bog (KOE:ACCROTELM/EST) peat core from Estonia (2021)
    PANGAEA
    Details
    Publication Date: 2023-12-12
    Description: Calibrated ages of a high-resolution peat core from the Past Global Changes - Carbon in Peat on EArth through Time (PAGES_C-PEAT) Project.
    Keywords: Age, 14C calibrated, Bacon 2.2 (Blaauw and Christen, 2011); Age, 14C calibrated, OxCal 4.2.4, P sequence deposition model; Calendar age; Calendar age, maximum/old; Calendar age, minimum/young; C-PEAT; DEPTH, sediment/rock; Estonia; KOE: ACCROTELM / EST; Mannikjarve_Bog; PAGES_C-PEAT; Past Global Changes - Carbon in Peat on EArth through Time; PEATC; Peat corer; Peatland
    Type: Dataset
    Format: text/tab-separated-values, 912 data points
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  • 3
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    Calibrated ages of Kontolanrahka Kontola peat core (2021)
    PANGAEA
    Details
    Publication Date: 2023-12-12
    Keywords: Age, 14C calibrated, Bacon 2.2 (Blaauw and Christen, 2011); Age, 14C calibrated, OxCal 4.2.4, P sequence deposition model; Calendar age; Calendar age, maximum/old; Calendar age, minimum/young; DEPTH, sediment/rock; Finland; Kontolanrahka_coreKontola; PAGES_C-PEAT; Past Global Changes - Carbon in Peat on EArth through Time; PEATC; Peat corer
    Type: Dataset
    Format: text/tab-separated-values, 918 data points
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  • 4
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    Age determination of Mannikjarve bog (KOE:ACCROTELM/EST) peat core from Estonia (2022)
    PANGAEA
    Details
    Publication Date: 2023-12-12
    Description: 14C and 210Pb age determination of a high-resolution peat core from the Past Global Changes - Carbon in Peat on EArth through Time (PAGES_C-PEAT) Project.
    Keywords: Age; Age, 14C uncalibrated; Age, 210Pb; Age, dated; Age, dated material; Age, relative, number of years; Age, uncertainty; calculated, 1 sigma; Calendar age; Comment; C-PEAT; DEPTH, sediment/rock; Estonia; KOE: ACCROTELM / EST; Laboratory code/label; Mannikjarve_Bog; PAGES_C-PEAT; Past Global Changes - Carbon in Peat on EArth through Time; PEATC; Peat corer; Peatland; Sample thickness
    Type: Dataset
    Format: text/tab-separated-values, 112 data points
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  • 5
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    Age determination of Kontolanrahka Kontola peat core (2021)
    PANGAEA
    Details
    Publication Date: 2023-12-12
    Keywords: Age; Age, 14C AMS; Age, dated; Age, dated material; Age, dated standard deviation; DEPTH, sediment/rock; Finland; Kontolanrahka_coreKontola; Laboratory code/label; Method comment; PAGES_C-PEAT; Past Global Changes - Carbon in Peat on EArth through Time; PEATC; Peat corer; Sample thickness; see Method comment
    Type: Dataset
    Format: text/tab-separated-values, 92 data points
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  • 6
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    Geochemistry of Kontolanrahka Kontola peat core (2021)
    PANGAEA
    Details
    Publication Date: 2023-12-12
    Keywords: Carbon, total; Density, dry bulk; DEPTH, sediment/rock; Finland; Kontolanrahka_coreKontola; PAGES_C-PEAT; Past Global Changes - Carbon in Peat on EArth through Time; PEATC; Peat corer; Sample thickness
    Type: Dataset
    Format: text/tab-separated-values, 459 data points
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  • 7
    Electronic Resource
    Electronic Resource
    Greenhouse gas dynamics in boreal, littoral sediments under raised CO2 and nitrogen supply (2003)
    Oxford, UK : Blackwell Science Ltd
    Freshwater biology 48 (2003), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY 1. The effects of increasing CO2 and nitrogen loading and of a change in water table and temperature on littoral CH4, N2O and CO2 fluxes were studied in a glasshouse experiment with intact sediment cores including vegetation (mainly sedges), taken from a boreal eutrophic lake in Finland. Sediments with the water table held at a level of 0 or at −15 cm were incubated in an atmosphere of 360 or 720 p.p.m. CO2 for 18 weeks. The experiment included fertilisation with NO3– and NH4+ (to a total 3 g N m−2).2. Changes in the water table and temperature strongly regulated sediment CH4 and cCO2 fluxes (community CO2 release), but did not affect N2O emissions. Increase in the water table increased CH4 emissions but reduced cCO2 release, while increase in temperature increased emissions of both CO2 and CH4.3. The raised CO2 increased carbon turnover in the sediments, such that cCO2 release was increased by 16–26%. However, CH4 fluxes were not significantly affected by raised CO2, although CH4 production potential (at 22 °C) of the sediments incubated at high CO2 was increased. In the boreal region, littoral CH4 production is more likely to be limited by temperature than by the availability of carbon. Raised CO2 did not affect N2O production by denitrification, indicating that this process was not carbon limited.4. A low availability of NO3– did severely limit N2O production. The NO3– addition caused up to a 100-fold increase in the fluxes of N2O. The NH4+ addition did not increase N2O fluxes, indicating low nitrification capacity in the sediments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2427.2003.01023.x
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  • 8
    Electronic Resource
    Electronic Resource
    Methane (CH4) release from littoral wetlands of Boreal lakes during an extended flooding period (2003)
    Oxford, UK : Blackwell Science Ltd
    Global change biology 9 (2003), S. 0 
    Details
    ISSN: 1365-2486
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Geography
    Notes: Lake littoral zones have a transitional nature and dynamic conditions, which are reflected in their CH4 emissions. Thus, detailed studies are needed to assess the littoral CH4 emissions in a regional scale. In this study, CH4 fluxes were followed during the ice-free seasons in 1998 and 1999 by using the static chamber method in the littoral zone of two lakes in Finland. An exceptionally high water level in 1998 caused an unusually long inundation in otherwise ephemerally flooded zone. The flooding was normal in year 1999. The factors controlling CH4 emissions were examined and statistical response functions were constructed. Further, the effect of extended flooding on the littoral CH4 budged was estimated. The methane flux was primarily regulated by the water level in grass and sedge dominated eulittoral zone, but not in infralittoral reed and water lily stands. Methane emissions in the sedge dominated zone decreased significantly, when the flood was high enough to submerge the venting structures of the plants. Besides water level, sediment temperature determined CH4 emission. The cumulative CH4 emissions from the whole littoral wetlands in wet year were 1.1 times (L. Kevätön), or 0.61 and 0.79 times (L. Mekrijärvi) those in dry year. The crucial factor was the discrepancy between the exceptional and the average water level. The extension of inundated area does not necessarily increase CH4 emissions if the flood reaches infrequently inundated areas, which apparently have low CH4 production potential. This is the case especially, if the emissions in lower zones simultaneously decrease due to high water level. Our study analyses these complex responses between CH4 emissions and water level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2486.2003.00595.x
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  • 9
    Electronic Resource
    Electronic Resource
    The contribution of plant roots to CO2 fluxes from organic soils (1996)
    Springer
    Biology and fertility of soils 23 (1996), S. 126-131 
    Details
    ISSN: 1432-0789
    Keywords: Key words Organic soil ; Root-derived respiration ; Soil respiration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The CO2 released in soil respiration is formed from organic matter which differs in age and stability, ranging from soluble root exudates to more persistent plant remains. The contribution of roots, a relatively fast component of soil cycling, was studied in three experiments. (1) Willows were grown in a greenhouse and CO2 fluxes from the substrate soil (milled peat) and from control peat were measured. (2) CO2 fluxes from various peatland sites were measured at control points and points where the roots were severed from the plants. (3) CO2 fluxes in cultivated grassland established on peatland were measured in grassy subsites and in subsites where the growth of grass was prevented by regular tilling. The root-derived respiration followed the typical annual phenology of the vegetation, being at its maximum in the middle and late summer. All the experiments gave similar results, root-derived respiration accounting for 35–45% of total soil respiration in the middle and late summer at sites with an abundant vegetation. The root-derived respiration from the virgin peatland sites correlated well with the tree biomass, and also partly with the understorey vegetation, but in the drained sites the root effect was greater, even in the presence of less understorey vegetation than at virgin subsites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00336052
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  • 10
    Electronic Resource
    Electronic Resource
    Seasonal variation in CH4 emissions and production and oxidation potentials at microsites on an oligotrophic pine fen (1997)
    Springer
    Oecologia 110 (1997), S. 414-422 
    Details
    ISSN: 1432-1939
    Keywords: Key words Methane ; Microsites ; Production ; Oxidation ; Oligotrophic fen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Temporal and spatial variation in CH4 emissions was studied at hummock, Eriophorum lawn, flark and Carex lawn microsites in an oligotrophic pine fen over the growing season using a static chamber method, and CH4 production and oxidation potentials in peat profiles from hummock and flark were determined in laboratory incubation experiments. Emissions were lowest in the hummocks, and decreased with increasing hummock height, while in the lawns and flarks they increased with increasing sedge cover. Statistical response functions with water table and peat temperature as independent variables were calculated in order to reconstruct seasonal CH4 emissions by reference to the time series for peat temperature and water table specific to each microsite type. Mean CH4 emissions in the whole area in the snow-free period of 1993, weighted in terms of the proportions of the microsites, were 1.7 mol CH4 m–2. Potential CH4 production and oxidation rates were very low in the hummocks rising above the groundwater table, but were relatively similar when expressed per dry weight of peat both in the hummocks and flarks below the water table. The CH4 production potential increased in autumn at both microsites and CH4 oxidation potential seemed to decrease. The decrease in temperature in autumn certainly reduced in situ decomposition processes, possibly leaving unused substrates in the peat, which would explain the increase in CH4 production potential.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004420050176
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