M
Martha J. Shearer
Researcher at Portland State University
Publications - 19
Citations - 1227
Martha J. Shearer is an academic researcher from Portland State University. The author has contributed to research in topics: Paddy field & Greenhouse gas. The author has an hindex of 16, co-authored 18 publications receiving 1138 citations.
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Journal ArticleDOI
Inventorying emissions from nature in Europe
David Simpson,Wilfried Winiwarter,Gunnar Börjesson,Steve Cinderby,Antonio Ferreiro,Alex Guenther,C. Nicholas Hewitt,Robert W. Janson,M. Aslam K. Khalil,Susan M. Owen,Tom Pierce,Hans Puxbaum,Martha J. Shearer,Ute Skiba,Rainer Steinbrecher,Leonor Tarrasón,Mats G. Öquist +16 more
TL;DR: In this paper, a new set of guidelines has been developed for assessing the emissions of sulphur, nitrogen oxides, NH3, CH4, and nonmethane volatile organic compounds (NMVOC) from biogenic and other natural sources in Europe.
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Atmospheric nitrous oxide: patterns of global change during recent decades and centuries.
TL;DR: The ice core data show that N2O started increasing only during the 20th century and that concentrations have now risen by about 27 ppbv or 9.4% over the last century.
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Emissions of Anaerobically Produced Methane by Trees
Andrew L. Rice,Christopher L. Butenhoff,Martha J. Shearer,Doaa Galal Mohammed Teama,Todd N. Rosenstiel,M. Aslam K. Khalil +5 more
TL;DR: In this article, the authors report results from a greenhouse mesocosm study that indicate significant emissions of anaerobically produced CH4 transmitted to the atmosphere through broadleaf riparian tree species grown under flooded conditions.
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Emissions of Methane, Nitrous Oxide, and other Trace Gases from Rice fields in China
TL;DR: In this paper, the emissions of methane, nitrous oxide, and other environmentally important trace gases from rice fields in China were measured using a series of experiments over a period of 5 years between 1992 and 1996.
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Factors affecting methane emissions from rice fields
TL;DR: In this paper, a 7-year data set on methane emissions from rice fields in Tu Zu, China, was analyzed to delineate the relationships between emissions and a number of variables that were measured at the same time.