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  • 1
    Electronic Resource
    Electronic Resource
    Spatial heterogeneity of ecosystem carbon fluxes in a broadleaved forest in Northern Germany (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: Carbon fluxes were investigated in a mature deciduous forest, located in Northern Germany (53°47′N–10°36′E), by means of eddy-covariance technique, stand survey and models. This forest has been managed following a concept of nature-oriented forestry since the 1980s. One of the goals of the study was to test whether changed management led to increased carbon sequestration. The forest contains several broadleaved tree species. Depending on wind direction, the fetch-area of the eddy-covariance data was dominated by different tree species. Three subplots dominated by Oak, Beech or Alder/Ash could be distinguished from the tower data. In each of these subplots, 30 × 30 m2 areas were defined to analyse leaf area index, litterfall and the increase of the wood biomass.Eddy-covariance analysis showed that the gross primary productivity (GPP′) was higher in the Oak subplot (−1794 g C m−2 yr−1) in comparison with the Beech plot and the Alder/Ash plot (−1470 and −1595 g C m−2 yr−1, respectively). The total ecosystem respiration (TER) was the highest in the Alder/Ash-dominated subplot (1401 g  C m−2 yr−1) followed by the Oak plot and the Beech plot (1235 and 1174 g C m−2 yr−1, respectively). The resulting net ecosystem productivity (NEP) was −559 g C m−2 yr−1 for the Oak-dominated subplot, −295 g C m−2 yr−1 for the Beech plot and −193 g C m−2 yr−1 for the Alder/Ash plot.From Stand survey and modelling, the net primary productivity was estimated as 1103, 702 and 671 g C m−2 yr−1 in the Oak, Beech and Alder/Ash plot, respectively. Also carbon flux with litterfall was the highest in the Oak plot 343 g C m−2 yr−1 and lowest in Alder/Ash plot (197 g m−2 yr−1) with the Beech plot in between (228 g m−2 yr−1). The observations indicate an increase of the proportion of litterfall with increasing GPP′ and a different ability of carbon sequestration of the three stands in medium temporary scale. Only in the Oak stand that comprised the oldest trees and the most structured canopy the carbon sequestration was increased compared with conventionally managed forests.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2486.2004.00884.x
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  • 2
    Electronic Resource
    Electronic Resource
    Aspects of carbon and nitrogen cycling in soils of the Bornhöved Lake district. I. Microbial characteristics and emissions of carbon dioxide and nitrous oxide of arable and grassland soils (1997)
    Springer
    Biogeochemistry 39 (1997), S. 189-205 
    Details
    ISSN: 1573-515X
    Keywords: agricultural soils ; arginine ammonification ; basal respiration ; CO2 emission ; microbial biomass content ; N2O emission
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Soil microbial biomass content, organic carbonmineralization as well as arginine ammonificationrates were estimated in samples from arable andgrassland soils and carbon dioxide and nitrous oxideemission rates were measured in situ at four sitesalong a catena. Soil microbial biomass contentincreased in the order, maize monoculture 〈 croprotation 〈 dry grassland 〈 wet grassland. The twoarable soils had similar rates of carbonmineralization in the laboratory at 22 °C (basalrespiration) as well as in situ (carbon dioxideemission) at field temperature. Under crop rotation,maize monoculture and dry grassland, the arginineammonification rate significantly correlated to themicrobial biomass content. In contrast, thebiomass-specific ammonification rate was low in wetgrassland soil, as were in situ N2O emission rates.Data from all sites together revealed no generalrelationship between microbial biomass content and Cand N mineralization rates. In addition, there was nogeneral relationship between the quantity of soilmicrobial biomass and the emission rates of thegreenhouse gases CO2 and N2O. The maize monocultureinduced a soil microbial community that was lessefficient in using organic carbon compounds, as shownby the high metabolic quotient (respiration rate perunit of biomass). However, microbial biomass contentwas proportional to basal respiration rate in soilsunder crop rotation, dry and wet grassland. Arginineammonification rate was related to microbial biomasscontent only in fertilized soils. Applications of highquantities of inorganic nitrogen and farmyard manureapparently increase in situ N2O emission rates,particularly under crop rotation. The microbialbiomass in the unfertilized wet grassland soil seemsto be a sink for nitrogen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005867931015
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  • 3
    Electronic Resource
    Electronic Resource
    Aspects of carbon and nitrogen cycling in soils of the Bornhöved Lake district II. Modelling the influence of temperature increase on soil respiration and organic carbon content in arable soils under different managements (1997)
    Springer
    Biogeochemistry 39 (1997), S. 207-224 
    Details
    ISSN: 1573-515X
    Keywords: agricultural soils ; climatic change ; modelling ; Q10-value ; soil organic matter ; soil respiration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Based on field measurements in two agriculturalecosystems, soil respiration and long-term response ofsoil organic carbon content (SOC) was modelled. Themodel predicts the influence of temperature increaseas well as the effects of land-use over a period ofthirty years in a northern German glacial morainelandscape. One of the fields carried a maizemonoculture treated with cattle slurry in addition tomineral fertilizer (“maize monoculture”), the otherwas managed by crop rotation and recieved organicmanure (“crop rotation”). The soils of both fieldswere classified as cambic Arenosols. The soilrespiration was measured in the fields by means of theopen dynamic inverted-box method and an infrared gasanalyser. The mean annual soil respiration rates were 268 (maizemonoculture) and 287 mg CO2 m-2 h-1(crop rotation). Factors controlling soil respirationwere soil temperature, soil moisture, root respirationand carbon input into the soil. Q10-valuesof soil respiration were generally higher in winterthan in summer. This trend is interpreted as anadaptive response of the soil microbial communities.In the model a novel mathematical approach withvariable Q10-values as a result oftemperature and moisture adjustment is proposed. Withthe calibrated model soil respiration and SOC werecalculated for both fields and simulations over aperiod of thirty years were established. Simulationswere based on (1) local climatic data, 1961 until1990, and (2) a regional climate scenario for northernGermany with an average temperature increase of 2.1 K.Over the thirty years period with present climateconditions, the SOC pool under “crop rotation” wasnearly stable due to the higher carbon inputs, whereasabout 16 t C ha-1 were lost under “maizemonoculture”. Under global warming the mean annualsoil respiration for both fields increased and SOCdecreased by ca. 10 t C ha-1 under “croprotation” and by more than 20 t C ha-1 under“maize monoculture”. It was shown that overestimationof carbon losses in long-term prognoses can be avoidedby including a Q10-adjustment in soilrespiration models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005859629197
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  • 4
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    Toward a Comprehensive and Integrated Strategy of the European Marine Research Infrastructures for Ocean Observations (2021)
    Frontiers
    Details
    Publication Date: 2021-05-12
    Description: Research Infrastructures (RIs) are large-scale facilities encompassing instruments, resources, data and services used by the scientific community to conduct high-level research in their respective fields. The development and integration of marine environmental RIs as European Research Vessel Operators [ERVO] (2020) is the response of the European Commission (EC) to global marine challenges through research, technological development and innovation. These infrastructures (EMSO ERIC, Euro-Argo ERIC, ICOS-ERIC Marine, LifeWatch ERIC, and EMBRC-ERIC) include specialized vessels, fixed-point monitoring systems, Lagrangian floats, test facilities, genomics observatories, bio-sensing, and Virtual Research Environments (VREs), among others. Marine ecosystems are vital for life on Earth. Global climate change is progressing rapidly, and geo-hazards, such as earthquakes, volcanic eruptions, and tsunamis, cause large losses of human life and have massive worldwide socio-economic impacts. Enhancing our marine environmental monitoring and prediction capabilities will increase our ability to respond adequately to major challenges and efficiently. Collaboration among European marine RIs aligns with and has contributed to the OceanObs’19 Conference statement and the objectives of the UN Decade of Ocean Science for Sustainable Development (2021–2030). This collaboration actively participates and supports concrete actions to increase the quality and quantity of more integrated and sustained observations in the ocean worldwide. From an innovation perspective, the next decade will increasingly count on marine RIs to support the development of new technologies and their validation in the field, increasing market uptake and produce a shift in observing capabilities and strategies.
    Description: Published
    Description: 180
    Description: 3A. Geofisica marina e osservazioni multiparametriche a fondo mare
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 5
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    The FLUXNET2015 dataset and the ONEFlux processing pipeline for eddy covariance data (2020)
    In:  EPIC3Scientific Data, 7(1), ISSN: 2052-4463
    Details
    Publication Date: 2021-06-29
    Description: The FLUXNET2015 dataset provides ecosystem-scale data on CO2, water, and energy exchange between the biosphere and the atmosphere, and other meteorological and biological measurements, from 212 sites around the globe (over 1500 site-years, up to and including year 2014). These sites, independently managed and operated, voluntarily contributed their data to create global datasets. Data were quality controlled and processed using uniform methods, to improve consistency and intercomparability across sites. The dataset is already being used in a number of applications, including ecophysiology studies, remote sensing studies, and development of ecosystem and Earth system models. FLUXNET2015 includes derived-data products, such as gap-filled time series, ecosystem respiration and photosynthetic uptake estimates, estimation of uncertainties, and metadata about the measurements, presented for the first time in this paper. In addition, 206 of these sites are for the first time distributed under a Creative Commons (CC-BY 4.0) license. This paper details this enhanced dataset and the processing methods, now made available as open-source codes, making the dataset more accessible, transparent, and reproducible.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 6
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    The European carbon balance : part 4 ; integration of carbon and other trace-gas fluxes (2010)
    Wuppertal : Wuppertal Institut für Klima, Umwelt, Energie
    Details
    Publication Date: 2018-11-21
    Description: Overviewing the European carbon (C), greenhouse gas (GHG), and non-GHG fluxes, gross primary productivity (GPP) is about 9.3 Pg yr-1, and fossil fuel imports are 1.6 Pg yr-1. GPP is about 1.25% of solar radiation, containing about 360 × 1018 J energy - five times the energy content of annual fossil fuel use. Net primary production (NPP) is 50%, terrestrial net biome productivity, NBP, 3%, and the net GHG balance, NGB, 0.3% of GPP. Human harvest uses 20% of NPP or 10% of GPP, or alternatively 1‰ of solar radiation after accounting for the inherent cost of agriculture and forestry, for production of pesticides and fertilizer, the return of organic fertilizer, and for the C equivalent cost of GHG emissions. C equivalents are defined on a global warming potential with a 100-year time horizon. The equivalent of about 2.4% of the mineral fertilizer input is emitted as N2O. Agricultural emissions to the atmosphere are about 40% of total methane, 60% of total NO-N, 70% of total N2O-N, and 95% of total NH3-N emissions of Europe. European soils are a net C sink (114 Tg yr−1), but considering the emissions of GHGs, soils are a source of about 26 Tg CO2 C-equivalent yr-1. Forest, grassland and sediment C sinks are offset by GHG emissions from croplands, peatlands and inland waters. Non-GHGs (NH3, NOx) interact significantly with the GHG and the C cycle through ammonium nitrate aerosols and dry deposition. Wet deposition of nitrogen (N) supports about 50% of forest timber growth. Land use change is regionally important. The absolute flux values total about 50 Tg C yr-1. Nevertheless, for the European trace-gas balance, land-use intensity is more important than land-use change. This study shows that emissions of GHGs and non-GHGs significantly distort the C cycle and eliminate apparent C sinks.
    Keywords: ddc:600
    Repository Name: Wuppertal Institut für Klima, Umwelt, Energie
    Language: English
    Type: article , doc-type:article
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  • 7
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    Building a global ecosystem research infrastructure to address global grand challenges for macrosystem ecology (2022)
    American Geophysical Union
    Details
    Publication Date: 2022-10-27
    Description: © The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Loescher, H., Vargas, R., Mirtl, M., Morris, B., Pauw, J., Yu, X., Kutsch, W., Mabee, P., Tang, J., Ruddell, B., Pulsifer, P., Bäck, J., Zacharias, S., Grant, M., Feig, G., Zheng, L., Waldmann, C., & Genazzio, M. Building a global ecosystem research infrastructure to address global grand challenges for macrosystem ecology. Earth’s Future, 10(5), (2022): e2020EF001696, https://doi.org/10.1029/2020ef001696.
    Description: The development of several large-, “continental”-scale ecosystem research infrastructures over recent decades has provided a unique opportunity in the history of ecological science. The Global Ecosystem Research Infrastructure (GERI) is an integrated network of analogous, but independent, site-based ecosystem research infrastructures (ERI) dedicated to better understand the function and change of indicator ecosystems across global biomes. Bringing together these ERIs, harmonizing their respective data and reducing uncertainties enables broader cross-continental ecological research. It will also enhance the research community capabilities to address current and anticipate future global scale ecological challenges. Moreover, increasing the international capabilities of these ERIs goes beyond their original design intent, and is an unexpected added value of these large national investments. Here, we identify specific global grand challenge areas and research trends to advance the ecological frontiers across continents that can be addressed through the federation of these cross-continental-scale ERIs.
    Description: This manuscript is in part the product of several workshops and ongoing GERI development. The first workshop was the Terrestrial Ecosystem Research Network (TERN) sponsored and entitled: “Towards a Global Ecosystem Observatory”, 5–7 March 2017, University of Queensland, Brisbane Australia. Another workshop was sponsored by Chinese Academy of Sciences (CAS) and entitled: “Global Integrated Research Infrastructure component in Next Generation ILTER”, 17–20 April, 2018, South China Botanical Garden, Zhaoqing, Guangdong Province, China. The National Science Foundation (NSF) supported two workshops. The first was entitled: ‘Building a Global Ecological Understanding’ held at the University of Delaware, Newark Delaware, 3–6 June, 2016 (NSF 1347883) and the second entitled: “Global Environmental Research Infrastructure (GERI) Planning Workshop”, held at NEON HQ, Boulder Colorado, 25–27 June 2019 (NSF 1917180). The authors wish to thank the workshop attendees for their thoughtful contributions. NEON is a project sponsored by the NSF and managed under cooperative support agreement (DBI-1029808) to Battelle.
    Keywords: Environmental research infrastructure ; Macrosystem science ; Interoperability ; Societal benefit ; New capabilities ; Federating infrastructure
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 8
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    Steeper declines in forest photosynthesis than respiration explain age-driven decreases in forest growth (2014)
    Details
    Publication Date: 2022-05-26
    Description: Author Posting. © The Author(s), 2014. This is the author's version of the work. It is posted here by permission of National Academy of Sciences for personal use, not for redistribution. The definitive version was published in Proceedings of the National Academy of Sciences of the United States of America 111 (2014): 8856-8860, doi:10.1073/pnas.1320761111.
    Description: The traditional view of forest dynamics originated by Kira, Shidei, and Odum suggests a decline in net primary productivity (NPP) in ageing forests due to stabilized gross primary productivity (GPP) and continuously increased autotrophic respiration (Ra). The validity of these trends in GPP and Ra is, however, very difficult to test because of the lack of long-term ecosystem-scale field observations of both GPP and Ra. Ryan and colleagues have proposed an alternative hypothesis drawn from site-specific results that aboveground respiration and belowground allocation decreased in ageing forests. Here we analyzed data from a recently assembled global database of carbon fluxes and show that the classical view of the mechanisms underlying the age-driven decline in forest NPP is incorrect and thus support Ryan’s alternative hypothesis. Our results substantiate the age-driven decline in NPP, but in contrast to the traditional view, both GPP and Ra decline in ageing boreal and temperate forests. We find that the decline in NPP in ageing forests is primarily driven by GPP, which decreases more rapidly with increasing age than Ra does, but the ratio of NPP/GPP remains approximately constant within a biome. Our analytical models describing forest succession suggest that dynamic forest ecosystem models that follow the traditional paradigm need to be revisited.
    Description: We thank all site investigators, their funding agencies and the various regional flux networks (Afriflux, AmeriFlux, AsiaFlux, CarboAfrica, CarboEurope-IP, ChinaFlux, Fluxnet-Canada, KoFlux, LBA, NECC, OzFlux, TCOS-Siberia, and USCCC) and the Fluxnet project, whose support is essential for obtaining the measurement data without which this synthesis analysis would not be possible. The collection of the original global database was funded by the Research Foundation - Flanders (FWO-Vlaanderen) who supported S.L. with a post-doctoral fellowship and a research grant (FWO 1.5037.07N). J. Tang was partially supported by U.S. Department of Energy the Office of Biological and Environmental Research (DE-SC0006951), and National Science Foundation (DBI-959333 and AGS-1005663).
    Description: 2014-12-02
    Keywords: Succession ; Chronosequence ; Forest dynamics ; Photosynthesis ; Respiration ; Carbon flux ; Carbon use efficiency
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
    Format: application/pdf
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