HatalaDettoSonnentagEtAl2012

Référence

Hatala, J.A., Detto, M., Sonnentag, O., Deverel, S.J., Verfaillie, J. and Baldocchi, D.D. (2012) Greenhouse gas (CO 2, CH 4, H 2O) fluxes from drained and flooded agricultural peatlands in the Sacramento-San Joaquin Delta. Agriculture, Ecosystems and Environment, 150:1-18. (Scopus )

Résumé

The Sacramento-San Joaquin Delta in California was drained and converted to agriculture more than a century ago, and since then has experienced extreme rates of soil subsidence from peat oxidation. To reverse subsidence and capture carbon there is increasing interest in converting drained agricultural land-use types to flooded conditions. Rice agriculture is proposed as a flooded land-use type with CO 2 sequestration potential for this region. We conducted two years of simultaneous eddy covariance measurements at a conventional drained and grazed degraded peatland and a newly converted rice paddy to evaluate the impact of drained to flooded land-use change on CO 2, CH 4, and evaporation fluxes.We found that the grazed degraded peatland emitted 175-299g-Cm -2yr -1 as CO 2 and 3.3g-Cm -2yr -1 as CH 4, while the rice paddy sequestered 84-283g-Cm -2yr -1 of CO 2 from the atmosphere and released 2.5-6.6g-Cm -2yr -1 as CH 4. The rice paddy evaporated 45-95% more water than the grazed degraded peatland. Annual photosynthesis was similar between sites, but flooding at the rice paddy inhibited ecosystem respiration, making it a net CO 2 sink. The rice paddy had reduced rates of soil subsidence due to oxidation compared with the drained peatland, but did not completely reverse subsidence. © 2012 Elsevier B.V.

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@ARTICLE { HatalaDettoSonnentagEtAl2012,
    AUTHOR = { Hatala, J.A. and Detto, M. and Sonnentag, O. and Deverel, S.J. and Verfaillie, J. and Baldocchi, D.D. },
    TITLE = { Greenhouse gas (CO 2, CH 4, H 2O) fluxes from drained and flooded agricultural peatlands in the Sacramento-San Joaquin Delta },
    JOURNAL = { Agriculture, Ecosystems and Environment },
    YEAR = { 2012 },
    VOLUME = { 150 },
    PAGES = { 1-18 },
    NOTE = { cited By 80 },
    ABSTRACT = { The Sacramento-San Joaquin Delta in California was drained and converted to agriculture more than a century ago, and since then has experienced extreme rates of soil subsidence from peat oxidation. To reverse subsidence and capture carbon there is increasing interest in converting drained agricultural land-use types to flooded conditions. Rice agriculture is proposed as a flooded land-use type with CO 2 sequestration potential for this region. We conducted two years of simultaneous eddy covariance measurements at a conventional drained and grazed degraded peatland and a newly converted rice paddy to evaluate the impact of drained to flooded land-use change on CO 2, CH 4, and evaporation fluxes.We found that the grazed degraded peatland emitted 175-299g-Cm -2yr -1 as CO 2 and 3.3g-Cm -2yr -1 as CH 4, while the rice paddy sequestered 84-283g-Cm -2yr -1 of CO 2 from the atmosphere and released 2.5-6.6g-Cm -2yr -1 as CH 4. The rice paddy evaporated 45-95% more water than the grazed degraded peatland. Annual photosynthesis was similar between sites, but flooding at the rice paddy inhibited ecosystem respiration, making it a net CO 2 sink. The rice paddy had reduced rates of soil subsidence due to oxidation compared with the drained peatland, but did not completely reverse subsidence. © 2012 Elsevier B.V. },
    AFFILIATION = { Ecosystem Science Division, Department of Environmental Science, Policy and Management, University of California 130, Mulford Hall #3114, Berkeley, CA 94720, United States; Smithsonian Tropical Research Institute, Panama City, Panama; Département de Géographie, Université de Montréal, Montreal, Canada; Hydrofocus, Inc., Davis, CA, United States },
    AUTHOR_KEYWORDS = { Carbon flux; Eddy covariance; Evaporation; Peatland; Rice },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1016/j.agee.2012.01.009 },
    SOURCE = { Scopus },
    URL = { https://www.scopus.com/inward/record.uri?eid=2-s2.0-84856499396&doi=10.1016%2fj.agee.2012.01.009&partnerID=40&md5=e398b10087f411abf089606c5eb75b4e },
}

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