RT Journal Article
SR Electronic
T1 Acclimation of methane emissions from rice paddy fields to straw addition
JF Science Advances
JO Sci Adv
FD American Association for the Advancement of Science
SP eaau9038
DO 10.1126/sciadv.aau9038
VO 5
IS 1
A1 Jiang, Yu
A1 Qian, Haoyu
A1 Huang, Shan
A1 Zhang, Xingyue
A1 Wang, Ling
A1 Zhang, Li
A1 Shen, Mingxing
A1 Xiao, Xiaoping
A1 Chen, Fu
A1 Zhang, Hailin
A1 Lu, Changying
A1 Li, Chao
A1 Zhang, Jun
A1 Deng, Aixing
A1 van Groenigen, Kees Jan
A1 Zhang, Weijian
YR 2019
UL http://advances.sciencemag.org/content/5/1/eaau9038.abstract
AB Straw incorporation is a common long-term practice to improve soil fertility in croplands worldwide. However, straw amendments often increase methane (CH4) emissions from rice paddies, one of the main sources of anthropogenic CH4. Intergovernmental Panel on Climate Change (IPCC) methodologies to estimate CH4 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 CH4 emissions acclimate. Effects of long-term (>5 years) straw application on CH4 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 CH4 oxidation rates through improved O2 transport into the rhizosphere. Our results suggest that recent model projections may have overestimated CH4 emissions from rice agriculture and that CH4 emission estimates can be improved by considering the duration of straw incorporation and other management practices.