Journal
SOIL BIOLOGY & BIOCHEMISTRY
Volume 139, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2019.107610
Keywords
Fe plaque; Denitrification; Nitrous oxide; Rhizosphere; Paddy soil
Categories
Funding
- National Natural Science Foundation of China [41771331, 41530859]
- Research Foundation of Education Bureau of Hunan Province [16B122]
- Natural Science Foundation of Fujian Province [2018J06010]
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Iron (Fe) plaque, defined as a film of poorly crystalline Fe oxides deposited on the surface of rice roots, potentially mediates paddy-soil N2O emissions. The aims of this study were to test if, and how, Fe plaque affects N2O production and reduction within a rice paddy soil. Rice seedlings were grown so that Fe plaque was either present or absent. With Fe plaque present, emissions of both N2O and N-2 doubled, with the abundance of both Fe-redox bacteria and denitrifying functional genes elevated at the root-soil interface. Under hydroponic conditions, Fe plaque promoted N2O emissions in the presence of NO3- but not NH4+. In addition, chelating the Fe(II) eliminated the promoting effects of Fe plaque on N2O emission while Fe(II) addition to the Fe plaque-free roots increased N2O emission. These results demonstrate that Fe plaque promotes soil N2O emission and N loss predominately via Fe(II) oxidation-coupled denitrification. Our results indicate that Fe plaque is a hotspot for both N2O emission and N loss from paddy soils. Mitigation of N2O emission and N loss from paddy soils should consider methods to limit Fe plaque effects.
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