Article: Fallow season CO2 and CH4 fluxes from U.S. mid-south rice-waterfowl habitats
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. |
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Keywords | drainage ; eddy covariance ; forests ; greenhouse gases ; income ; meteorology ; methane ; migratory birds ; rice ; soil ; water quality ; Arkansas |
Language | English |
Dates of publication | 2019-08 |
Document type | Article |
Note | NAL-AP-2-clean |
ZDB-ID | 409905-9 |
ISSN | 0168-1923 |
ISSN | 0168-1923 |
DOI | 10.2489/jswc.75.3.291 |
Database | NAL-Catalogue (AGRICOLA) |
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