Methane emissions from dairy lagoons in the western United States.

Autor: Leytem AB; USDA-Agricultural Research Service, Northwest Irrigation and Soils Research Laboratory, Kimberly, ID 83341. Electronic address: April.leytem@ars.usda.gov., Bjorneberg DL; USDA-Agricultural Research Service, Northwest Irrigation and Soils Research Laboratory, Kimberly, ID 83341., Koehn AC; USDA-Agricultural Research Service, Northwest Irrigation and Soils Research Laboratory, Kimberly, ID 83341., Moraes LE; Department of Animal Sciences, The Ohio State University, Columbus 43210., Kebreab E; Department of Animal Science, University of California-Davis, Davis 95616., Dungan RS; USDA-Agricultural Research Service, Northwest Irrigation and Soils Research Laboratory, Kimberly, ID 83341.
Jazyk: angličtina
Zdroj: Journal of dairy science [J Dairy Sci] 2017 Aug; Vol. 100 (8), pp. 6785-6803. Date of Electronic Publication: 2017 Jun 07.
DOI: 10.3168/jds.2017-12777
Abstrakt: Methane generation from dairy liquid storage systems is a major source of agricultural greenhouse gas emissions. However, little on-farm research has been conducted to estimate and determine the factors that may affect these emissions. Six lagoons in south-central Idaho were monitored for 1 yr, with CH 4 emissions estimated by inverse dispersion modeling. Lagoon characteristics thought to contribute to CH 4 emissions were also monitored over this time period. Average emissions from the lagoons ranged from 30 to 126 kg/ha per day or 22 to 517 kg/d. Whereas we found a general trend for greater emissions during the summer, when temperatures were greater, events such as pumping, rainfall, freeze or thaw of lagoon surfaces, and wind significantly increased CH 4 emissions irrespective of temperature. Lagoon physicochemical characteristics, such as total solids, chemical oxygen demand, and volatile solids, were highly correlated with emission. Methane prediction models were developed using volatile solids, wind speed, air temperature, and pH as independent variables. The US Environmental Protection Agency methodology for estimating CH 4 emissions from manure storage was used for comparison of on-farm CH 4 emissions from 1 of the lagoon systems. The US Environmental Protection Agency method underestimated CH 4 emissions by 48%. An alternative methodology, using volatile solids degradation factor, provided a more accurate estimate of annual emissions from the lagoon system and may hold promise for applicability across a range of dairy lagoon systems in the United States.
(The Authors. Published by the Federation of Animal Science Societies and Elsevier Inc. on behalf of the American Dairy Science Association®. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/).)
Databáze: MEDLINE
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