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  1. Artikel: Fallow season CO2 and CH4 fluxes from U.S. mid-south rice-waterfowl habitats

    Reba, Michele L / Fong, Bryant N / Rijal, Ishara

    Agricultural and forest meteorology. 2019 Aug., v. 75, no. 3

    2019  

    Abstract: Flooding rice fields in the U.S. mid-south during the fallow season (November-March) for migratory bird habitats provides revenue from hunting-related activities and helps with soil retention and water quality. However, flooding has the potential to ... ...

    Abstract Flooding rice fields in the U.S. mid-south during the fallow season (November-March) for migratory bird habitats provides revenue from hunting-related activities and helps with soil retention and water quality. However, flooding has the potential to increase greenhouse gas (GHG) emissions. Research on GHG emissions during this time has been limited. Eddy covariance (EC) systems measuring CO(2)nd CH4 fluxes were installed during the 2015-2016, 2016-2017, and 2017-2018 fallow seasons and during the previous growing seasons at paired fields in NE Arkansas. The paired fields consisted of one field flooded (F) with precipitation by installing barriers to prevent drainage and the other field allowed to drain or non-flooded (NF). Emissions from the fallow season accounted for 32-34% of the growing season CO( 2missions and 20-22% of growing season CH4 emissions, with fallow flooding contributing roughly 2% more than NF fields. Flooding did not influence CO(2)missions significantly. However, considering only the fallow season, F fields emitted 45±2% more CH4 than NF fields. The three-year fallow season average was 1355±132 kg CO(2) ha(-1)eason(-1)nd 8.6±1.4 kg CH4-C ha(-1)eason(-1)n NF fields, and 1408±185 kg CO(-) ha(-1)eason(-1)nd 12.5±2.0 kg CH4-C ha(-1)eason(-1)n F fields. Methane contributed on average 7±1% to total fallow season global warming potential (GWP), reported as CO( 2)uivalents from CO(2) and H4 measurements. The three-year fallow season average GWP was not different by treatment. Increases in fallow season GWP were noted to increase after rice cultivation. These findings will improve our overall understanding and modeling of GHG emissions from agricultural fields during an understudied but important period of the year.
    Schlagwörter drainage ; eddy covariance ; forests ; greenhouse gases ; income ; meteorology ; methane ; migratory birds ; rice ; soil ; water quality ; Arkansas
    Sprache Englisch
    Erscheinungsverlauf 2019-08
    Dokumenttyp Artikel
    Anmerkung NAL-AP-2-clean
    ZDB-ID 409905-9
    ISSN 0168-1923
    ISSN 0168-1923
    DOI 10.2489/jswc.75.3.291
    Datenquelle NAL Katalog (AGRICOLA)

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  2. Artikel: Fallow season CO2 and CH4 fluxes from US mid-south rice-waterfowl habitats

    Reba, Michele L / Fong, Bryant N / Rijal, Ishara

    Agricultural and forest meteorology. 2019 Aug. 14,

    2019  

    Abstract: Flooding rice fields in the US mid-south during the fallow season (November-March) for migratory waterfowl habitats provides revenue from hunting-related activities and helps with soil retention and water quality. However, flooding has the potential to ... ...

    Abstract Flooding rice fields in the US mid-south during the fallow season (November-March) for migratory waterfowl habitats provides revenue from hunting-related activities and helps with soil retention and water quality. However, flooding has the potential to increase greenhouse gas (GHG) emissions. Research on GHG emissions in US mid-south during the fallow season has been limited. Eddy covariance (EC) systems measuring CO2 and CH4 fluxes were installed during the 2015-2016, 2016-2017, and 2017-2018 fallow seasons at paired production-sized fields in NE Arkansas. Rice residue was burned after harvest at both field locations. The paired fields were separated by an access road and consisted of one field flooded (F) with precipitation by installing barriers to prevent drainage and the other field allowed to drain or non-flooded field (NF). Flooding did not influence CO2 emissions during the fallow season significantly. However, F fields emitted 45±2% more CH4 than NF fields. The three-year fallow season average was 1408±185 kg CO2-C ha-1 season-1 and 12.5±2.0 kg CH4-C ha-1 season-1 in F fields and 1355±132 kg CO2-C ha-1 season-1 and 8.6±1.4 kg CH4-C ha-1 season-1 in NF fields. Methane contributed 5 to 10% global warming potential (GWP), reported as CO2 equivalents from CO2 and CH4 measurements. The three-year fallow season average GWP was not different by treatment. Increases in fallow season GWP were noted to increase after rice cultivation. These findings will improve our overall understanding and modeling of GHG emissions from agricultural fields during an understudied but important period of the year.
    Schlagwörter carbon dioxide ; crop production ; drainage ; eddy covariance ; fallow ; global warming potential ; greenhouse gas emissions ; greenhouse gases ; habitats ; income ; methane ; methane production ; migratory birds ; models ; Oryza sativa ; paddies ; rice ; soil ; water quality ; Arkansas
    Sprache Englisch
    Erscheinungsverlauf 2019-0814
    Erscheinungsort Elsevier B.V.
    Dokumenttyp Artikel
    Anmerkung Pre-press version
    ZDB-ID 409905-9
    ISSN 0168-1923
    ISSN 0168-1923
    DOI 10.1016/j.agrformet.2019.107709
    Datenquelle NAL Katalog (AGRICOLA)

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  3. Artikel: Fate of environmental pollutants: A review

    Aryal, Niroj / Wood, Jonae / Rijal, Ishara / Deng, Dongyang / Jha, Manoj K. / Ofori‐Boadu, Andrea

    Water environment research. 2020 Oct., v. 92, no. 10

    2020  

    Abstract: A review of the literature published in 2019 on topics associated with the fate of environmental pollutants is presented. Environmental pollutants covered include pharmaceuticals, antibiotic‐resistant bacteria and genes, pesticides and veterinary ... ...

    Abstract A review of the literature published in 2019 on topics associated with the fate of environmental pollutants is presented. Environmental pollutants covered include pharmaceuticals, antibiotic‐resistant bacteria and genes, pesticides and veterinary medicines, personal care products and emerging pollutants, PFAS, microplastics, nanomaterials, heavy metals and radionuclides, nutrients, pathogens and indicator organisms, and oil and hydrocarbons. For each pollutant, the occurrence in the environment and/or their fate in engineered as well as natural systems in matrices including water, soil, wastewater, stormwater, runoff, and/or manure is presented based on the published literature. The review includes current developments in understanding pollutants in natural and engineered systems, and relevant physico‐chemical processes, as well as biological processes.
    Schlagwörter antibiotic resistance ; drugs ; environment ; microplastics ; oils ; pollutants ; research ; soil ; stormwater ; wastewater
    Sprache Englisch
    Erscheinungsverlauf 2020-10
    Umfang p. 1587-1594.
    Erscheinungsort John Wiley & Sons, Ltd
    Dokumenttyp Artikel
    Anmerkung REVIEW
    ZDB-ID 1098976-6
    ISSN 1554-7531 ; 1047-7624 ; 1061-4303
    ISSN (online) 1554-7531
    ISSN 1047-7624 ; 1061-4303
    DOI 10.1002/wer.1404
    Datenquelle NAL Katalog (AGRICOLA)

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  4. Artikel ; Online: Fate of environmental pollutants: A review.

    Aryal, Niroj / Wood, Jonae / Rijal, Ishara / Deng, Dongyang / Jha, Manoj K / Ofori-Boadu, Andrea

    Water environment research : a research publication of the Water Environment Federation

    2020  Band 92, Heft 10, Seite(n) 1587–1594

    Abstract: A review of the literature published in 2019 on topics associated with the fate of environmental pollutants is presented. Environmental pollutants covered include pharmaceuticals, antibiotic-resistant bacteria and genes, pesticides and veterinary ... ...

    Abstract A review of the literature published in 2019 on topics associated with the fate of environmental pollutants is presented. Environmental pollutants covered include pharmaceuticals, antibiotic-resistant bacteria and genes, pesticides and veterinary medicines, personal care products and emerging pollutants, PFAS, microplastics, nanomaterials, heavy metals and radionuclides, nutrients, pathogens and indicator organisms, and oil and hydrocarbons. For each pollutant, the occurrence in the environment and/or their fate in engineered as well as natural systems in matrices including water, soil, wastewater, stormwater, runoff, and/or manure is presented based on the published literature. The review includes current developments in understanding pollutants in natural and engineered systems, and relevant physico-chemical processes, as well as biological processes.
    Mesh-Begriff(e) Environmental Monitoring ; Environmental Pollutants/analysis ; Plastics ; Waste Water ; Water Pollutants, Chemical/analysis
    Chemische Substanzen Environmental Pollutants ; Plastics ; Waste Water ; Water Pollutants, Chemical
    Sprache Englisch
    Erscheinungsdatum 2020-08-06
    Erscheinungsland United States
    Dokumenttyp Journal Article ; Review
    ZDB-ID 1098976-6
    ISSN 1554-7531 ; 1047-7624 ; 1061-4303
    ISSN (online) 1554-7531
    ISSN 1047-7624 ; 1061-4303
    DOI 10.1002/wer.1404
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  5. Artikel: Methane flux measurements in rice by static flux chamber and eddy covariance

    Reba, Michele L. / Fong, Bryant N. / Rijal, Ishara / Adviento‐Borbe, M. Arlene / Chiu, Yin‐Lin / Massey, Joseph H.

    Agrosystems, geosciences & environment. 2020, v. 3, no. 1

    2020  

    Abstract: Understanding methane (CH₄) fluxes from rice (Oryza sativa L.) at the field scale is paramount to reducing environmental impacts while ensuring global food security. Greenhouse gas (GHG) measurements at the plot scale using static flux chambers (SFC) ... ...

    Abstract Understanding methane (CH₄) fluxes from rice (Oryza sativa L.) at the field scale is paramount to reducing environmental impacts while ensuring global food security. Greenhouse gas (GHG) measurements at the plot scale using static flux chambers (SFC) have long informed the understanding of flux dynamics and have largely been the basis of global flux estimates. However, in many parts of the world, the landscapes where agricultural fluxes are generated come from larger fields. Eddy covariance (EC) can measure trace gases on larger fields, but there are few studies available quantifying CH₄ emissions under typical practices at a field scale. Furthermore, few of these studies are from the U.S. Midsouth, the largest producer of U.S. rice. This study compares and quantifies field‐scale SFC and EC flux measurements on a large commercial system in northeastern Arkansas during the 2015 and 2016 growing seasons, following typical producer practices. Daily measured SFC CH₄ fluxes did not differ from EC‐daily CH₄ fluxes (p = .108). Total season CH₄ emissions, calculated as the sum of daily fluxes ranged from 50 to 156 kg CH₄ ha⁻¹ season⁻¹, with SFC reporting greater emissions than EC. Although SFC and EC‐daily flux measurements were similar early (p = .382) and late (p = .543) in the season, they differed mid‐season (p < .001) with SFC consistently reporting greater fluxes than EC. The findings of this study help unify season long plot‐scale and field‐scale flux measurements and signify an advancement of our understanding of GHG fluxes from rice systems.
    Schlagwörter Oryza sativa ; eddy covariance ; environment ; food security ; greenhouse gases ; methane ; methane production ; rice ; Arkansas
    Sprache Englisch
    Erscheinungsort John Wiley & Sons, Ltd
    Dokumenttyp Artikel
    Anmerkung JOURNAL ARTICLE
    ISSN 2639-6696
    DOI 10.1002/agg2.20119
    Datenquelle NAL Katalog (AGRICOLA)

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