A 3-year continuous record on the influence of daytime, season, and fertilizer treatment on methane emission rates from an Italian rice paddy

Journal Article · Mon Nov 20 00:00:00 EST 1989 · Journal of Geophysical Research; (USA)

DOI:https://doi.org/10.1029/JD094iD13p16405· OSTI ID:7169728

Schuetz, H; Holzapfel-Pschorn, A; Conrad, R; Rennenberg, H; Seiler, W ^[1]

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1. Fraunhofer-Institut fuer Atmosphaerische Umweltforschung, Garmisch-Partenkirchen, Federal Republic of Germany (DE)

CH{sub 4} emission rates have been measured in an Italian rice paddy between 1984 and 1986, covering three vegetation periods. For these measurements a fully automated, computerized sampling and analyzing system was developed which allowed the simultaneous determination of CH{sub 4} emission rates at 16 different field plots. CH{sub 4} emission rates showed strong diurnal and seasonal variations. Diurnal changes correlated with changes in soil temperature. During the season, CH{sub 4} emission rates showed a first maximum in May--June before tillering and a second maximum in July during the reproductive stage of the rice plants. In 1985 and 1986 two maxima were observed during summer in addition to the first maximum in the rate of CH{sub 4} emission during spring. Application of mineral and/or organic fertilizer application. Thus the rates decreased by at most 40% and 60% after fertilization by deep incorporation with 200 kg N/ha urea and 200 kg N/ha ammonium sulfate, respectively. Application of 200 kg N/ha calcium cyanamide led to a reduction of the first maximum of CH{sub 4} emission but caused the second maximum to increase, the overall result being that the seasonally averaged CH{sub 4} emission rate was comparable to that observed in unfertilized fields. Application of rice straw at a rate of 12t/ha enhanced the rate of CH{sub 4} emission by a factor of 2 compared with the control. Higher application rates of rice straw did not cause a further increase in CH{sub 4} emission.

• OSTI ID: 7169728
• Journal Information: Journal of Geophysical Research; (USA), Vol. 94:D13; ISSN 0148-0227
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
ITALY
ATMOSPHERIC CHEMISTRY
METHANE
EMISSION
TROPOSPHERE
DAILY VARIATIONS
ENVIRONMENTAL IMPACTS
FERTILIZERS
OXIDATION
OZONE
POLLUTION SOURCES
SEASONAL VARIATIONS
SOILS
STRATOSPHERE
TEMPERATURE DEPENDENCE
ALKANES
CHEMICAL REACTIONS
CHEMISTRY
EARTH ATMOSPHERE
EUROPE
HYDROCARBONS
ORGANIC COMPOUNDS
VARIATIONS
WESTERN EUROPE
540120* - Environment
Atmospheric- Chemicals Monitoring & Transport- (1990-)