In:
Science Advances, American Association for the Advancement of Science (AAAS), Vol. 5, No. 1 ( 2019-01-04)
Abstract:
Straw incorporation is a common long-term practice to improve soil fertility in croplands worldwide. However, straw amendments often increase methane (CH 4 ) emissions from rice paddies, one of the main sources of anthropogenic CH 4 . Intergovernmental Panel on Climate Change (IPCC) methodologies to estimate CH 4 emissions from rice agriculture assume that the effect of straw addition remains constant over time. Here, we show through a series of experiments and meta-analysis that these CH 4 emissions acclimate. Effects of long-term ( 〉 5 years) straw application on CH 4 emissions were, on average, 48% lower than IPCC estimates. Long-term straw incorporation increased soil methanotrophic abundance and rice root size, suggesting an increase in CH 4 oxidation rates through improved O 2 transport into the rhizosphere. Our results suggest that recent model projections may have overestimated CH 4 emissions from rice agriculture and that CH 4 emission estimates can be improved by considering the duration of straw incorporation and other management practices.
Type of Medium:
Online Resource
ISSN:
2375-2548
DOI:
10.1126/sciadv.aau9038
Language:
English
Publisher:
American Association for the Advancement of Science (AAAS)
Publication Date:
2019
detail.hit.zdb_id:
2810933-8
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