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  • 1
    Electronic Resource
    Electronic Resource
    Methane emissions from municipal wastewater treatment processes (1993)
    s.l. : American Chemical Society
    Environmental science & technology 27 (1993), S. 2472-2477 
    Details
    ISSN: 1520-5851
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/es00048a025
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Nitrous Oxide Emissions from Municipal Wastewater Treatment (1995)
    s.l. : American Chemical Society
    Environmental science & technology 29 (1995), S. 2352-2356 
    Details
    ISSN: 1520-5851
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/es00009a027
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Fine root dynamics and trace gas fluxes in two lowland tropical forest soils (2005)
    Oxford, UK : Blackwell Science Ltd
    Global change biology 11 (2005), S. 0 
    Details
    ISSN: 1365-2486
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Geography
    Notes: Fine root dynamics have the potential to contribute significantly to ecosystem-scale biogeochemical cycling, including the production and emission of greenhouse gases. This is particularly true in tropical forests which are often characterized as having large fine root biomass and rapid rates of root production and decomposition. We examined patterns in fine root dynamics on two soil types in a lowland moist Amazonian forest, and determined the effect of root decay on rates of C and N trace gas fluxes. Root production averaged 229 (±35) and 153 (±27) g m−2 yr−1 for years 1 and 2 of the study, respectively, and did not vary significantly with soil texture. Root decay was sensitive to soil texture with faster rates in the clay soil (k=−0.96 year−1) than in the sandy loam soil (k=−0.61 year−1), leading to greater standing stocks of dead roots in the sandy loam. Rates of nitrous oxide (N2O) emissions were significantly greater in the clay soil (13±1 ng N cm−2 h−1) than in the sandy loam (1.4±0.2 ng N cm−2 h−1). Root mortality and decay following trenching doubled rates of N2O emissions in the clay and tripled them in sandy loam over a 1-year period. Trenching also increased nitric oxide fluxes, which were greater in the sandy loam than in the clay. We used trenching (clay only) and a mass balance approach to estimate the root contribution to soil respiration. In clay soil root respiration was 264–380 g C m−2 yr−1, accounting for 24% to 35% of the total soil CO2 efflux. Estimates were similar using both approaches. In sandy loam, root respiration rates were slightly higher and more variable (521±206 g C m2 yr−1) and contributed 35% of the total soil respiration. Our results show that soil heterotrophs strongly dominate soil respiration in this forest, regardless of soil texture. Our results also suggest that fine root mortality and decomposition associated with disturbance and land-use change can contribute significantly to increased rates of nitrogen trace gas emissions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2486.2005.00903.x
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  • 4
    Electronic Resource
    Electronic Resource
    Radon fluxes in tropical forest ecosystems of Brazilian Amazonia: night-time CO2 net ecosystem exchange derived from radon and eddy covariance methods (2004)
    Oxford, UK : Blackwell Science Ltd
    Global change biology 10 (2004), S. 0 
    Details
    ISSN: 1365-2486
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Geography
    Notes: Radon-222 (Rn-222) is used as a transport tracer of forest canopy–atmosphere CO2 exchange in an old-growth, tropical rain forest site near km 67 of the Tapajós National Forest, Pará, Brazil. Initial results, from month-long periods at the end of the wet season (June–July) and the end of the dry season (November–December) in 2001, demonstrate the potential of new Rn measurement instruments and methods to quantify mass transport processes between forest canopies and the atmosphere. Gas exchange rates yield mean canopy air residence times ranging from minutes during turbulent daytime hours to greater than 12 h during calm nights. Rn is an effective tracer for net ecosystem exchange of CO2 (CO2 NEE) during calm, night-time hours when eddy covariance-based NEE measurements are less certain because of low atmospheric turbulence. Rn-derived night-time CO2 NEE (9.00±0.99 μmol m−2 s−1 in the wet season, 6.39±0.59 in the dry season) was significantly higher than raw uncorrected, eddy covariance-derived CO2 NEE (5.96±0.51 wet season, 5.57±0.53 dry season), but agrees with corrected eddy covariance results (8.65±1.07 wet season, 6.56±0.73 dry season) derived by filtering out lower NEE values obtained during calm periods using independent meteorological criteria. The Rn CO2 results suggest that uncorrected eddy covariance values underestimate night-time CO2 loss at this site. If generalizable to other sites, these observations indicate that previous reports of strong net CO2 uptake in Amazonian terra firme forest may be overestimated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2486.2004.00764.x
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of a lowered water table on nitrous oxide fluxes from northern peatlands (1993)
    [s.l.] : Nature Publishing Group
    Nature 366 (1993), S. 51-53 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The sites examined in eastern (site 1, 62° 51' N and 30° 53' E) and central Finland (sites 2, 3, 4 and 5 which are a part of the Lakkasuo mire complex, 61° 47' N and 24° 18' E) differed in their nutrient status and vegetation (Table 1), and represent both ombrotrophic and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/366051a0
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Seasonal variation of methane emissions from a temperate swamp (1989)
    Springer
    Biogeochemistry 8 (1989), S. 55-71 
    Details
    ISSN: 1573-515X
    Keywords: methane flux ; atmospheric CH4 budget ; wetlands ; seasonal variation ; temperature/flux relationship ; porewater chemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Methane flux measurements were made at four sites in a freshwater temperate swamp over the 13 month period of April 1985 through May 1986. Emissions were highly variable both between sites and over time at any one site. Ebullition from sediments was an important component of methane release. Although release of methane through bubbling occurred in only 19% of the measurements made between April and June 1985, when instrumentation allowed us to separate diffusive and bubble fluxes, ebullition accounted for 34% of the total flux during this period. Methane release rates showed a strong seasonal variation, with highest emission rates observed in early spring and again in late summer, which was associated with changes in plant growth and physiology. Emission rates were partially correlated with sediment temperature, but the relationship was not straightforward, and resembled a step function. Emissions responded strongly to temperature change through the range of 10–16°C. At winter sediment temperatures between 4–9°C, CH4 flux continued at low rates (0–28 mg CH4 m−2d−1; average = 7.9 mg CH4m−2d−1) and appeared insensitive to changes in sediment temperature. Annual methane emission from three constantly flooded sites (mean water depth = 35 cm) was 43.7 +/- 7.8 gm−2 (standard error); annual flux from a bank site was 41.4 +/- 20.5 gm−2. A comparison of flux measurements from fresh and saline wetlands in the immediate area of Newport News Swamp emphasizes the importance of edaphic factors in controlling flux.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02180167
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    Paper (German National Licenses)
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  • 7
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    (Table 1) Radiocarbon dating of peat cores LVPS4 and LVPS5B
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Age, 14C AMS; Age, 14C calibrated, OxCal 3; Age, dated; Age, dated material; Age, dated standard deviation; Age, maximum/old; Age, minimum/young; Calendar age; Core; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Laboratory; Lek-Vorkuta; Northeast Russia; PEATC; Peat corer; Sample comment
    Type: Dataset
    Format: text/tab-separated-values, 48 data points
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    DATA PANGAEA
  • 8
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    (Table 2) Major n-alkane homologues and plant macrofossils observed along peat profiles LVPS4 and LVPS5B (2011)
    PANGAEA
    Details
    Publication Date: 2024-02-06
    Keywords: DEPTH, sediment/rock; Lek-Vorkuta; n-Alkane; n-Alkane, carbon maximum number; Northeast Russia; PEATC; Peat corer; Plant debris; Reference/source; Zone
    Type: Dataset
    Format: text/tab-separated-values, 91 data points
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    DATA PANGAEA
  • 9
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    Radiocarbon ages and major n-alkane homologues of peat cores LVPS4 and LVPS5B, Russian Arctic (2011)
    PANGAEA
    In:  Supplement to: Andersson, Rina A; Kuhry, Peter; Meyers, Philip; Zebühr, Yngve; Crill, Patrick; Mörth, Magnus (2011): Impacts of paleohydrological changes on n-alkane biomarker compositions of a Holocene peat sequence in the eastern European Russian Arctic. Organic Geochemistry, 42(9), 1065-1075, https://doi.org/10.1016/j.orggeochem.2011.06.020
    Details
    Publication Date: 2023-12-13
    Description: Coupled analyses of n-alkane biomarkers and plant macrofossils from a peat plateau deposit in the northeast European Russian Arctic were carried out to assess the effects of past hydrology on the molecular contributions of plants to the peat. The n-alkane biomarkers accumulated over 9.6 kyr of local paleohydrological changes in this complex peat profile in which a succession of vegetation changes occurred during a transition from a wet fen to a relatively dry peat plateau bog. This study shows that the contribution of the n-C31 alkane from rootlets to peat layers rich in fine and dark roots is important. The results further indicate that the n-alkane Paq and n-C23/n-C29 biomarker proxies that have been useful to reconstruct past water table levels in many peat deposits can be misleading when the contributions of Betula and Sphagnum fuscum to the peat are large. Under these conditions, the C23/(C27 + C31) n-alkane ratio seems to correct for the presence of Betula and S. fuscum and provides a better description for the relative amounts of moisture. The average chain length (ACL) n-alkane proxy also appears to be a good paleohydrology proxy in having larger values during dry and cold conditions in this Arctic bog setting.
    Keywords: International Polar Year (2007-2008); IPY; Lek-Vorkuta; Northeast Russia; PEATC; Peat corer
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 10
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    Methane transport mechanisms and isotopic fractionation in emergent macrophytes of an Alaskan tundra lake (1992)
    AGU (American Geophysical Union)
    In:  Journal of Geophysical Research - Atmospheres, 97 (D15). pp. 16681-16688.
    Details
    Publication Date: 2018-01-29
    Description: The carbon isotopic composition of methane emitted by the Alaskan emergent aquatic plants Arctophila fulva, a tundra mid-lake macrophyte, and Carex rostrata, a tundra lake margin macrophyte, was −58.6 ± 0.5 (n=2) and −66.6±2.5 (n= 6) ‰ respectively. The methane emitted by these species was found to be depleted in 13C by 12‰ and 18‰, relative to methane withdrawn from plant stems 1 to 2 cm below the waterline. As the macrophyte-mediated methane flux represented approximately 97% of the flux from these sites, these results suggest the more rapid transport of 12CH4 relative to 13CH4 through plants to the atmosphere. This preferential release of the light isotope of methane, possibly combined with CH4 oxidation, caused the buildup of the heavy isotope within plant stems. Plant stem methane concentrations ranged from 0.2 to 4.0% ( math formula, 1.4; standard deviation (sd), 0.9; n=28) in Arctophila, with an isotopic composition of −46.1±4.3 ‰ (n = 8). Carex stem methane concentrations were lower, ranging from 150 to 1200 ppm ( math formula, 500; standard deviation, 360; n = 8), with an isotopic composition of −48.3±1.4‰ (n=3). Comparisons of the observed isotopic fractionations with those predicted from gas phase effusion and diffusion coefficients suggest a combination of one or both of these gas transport mechanisms with bulk (non-fractionationating) flow.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/90JD01542
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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