Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 650, Issue -, Pages 1787-1794Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2018.09.341
Keywords
Soil acidification; Ammonia-oxidizing archaea (AOA); Ammonia-oxidizing bacteria (AOB); Nitrous oxide; Nitrite
Categories
Funding
- National Natural Science Foundation of China [41471192]
- Special Fund for Agro-Scientific Research in the Public Interest [201503106]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province, China [KYCX18_ 0678]
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Little is known about the effects of nitrogen (N) fertilization rates on ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) and their differential contribution to nitrous oxide (N2O) production, particularly in greenhouse based high N input vegetable soils. Six N treatments (N1, N2, N3, N4, N5 and N6 representing 0, 293, 587, 880, 1173 and 1760 kg N ha(-1) yr(-1), respectively) were continuously managed for three years in a typically intensified vegetable field in China. The aerobic incubation experiment involving these field-treated soils was designed to evaluate the relative contributions of AOA and AOB to N2O production by using acetylene or 1-octyne as inhibitors. The results showed that the soil pH and net nitrification rate gradually declined with increasing the fertilizer N application rates. The AOA were responsible for 44-71% of the N2O production with negligible N2O from AOB in urea unamended control soils. With urea amendment, the AOA were responsible for 48-53% of the N2O production in the excessively fertilized soils, namely the N5-N6 soils, while the AOB were responsible for 42-55% in the conventionally fertilized soils, namely the N1-N4 soils. Results indicated that overdose fertilization induced higher AOA-dependent N2O production than AOB, whereas urea supply led to higher AOB-dependent N2O production than AOA in conventionally fertilized soils. Additionally, a positive relationship existed between N2O production and NO2- accumulation during the incubation. Further mechanisms for NO2--dependent N2O production in intensive vegetable soils therefore deserve urgent attention. (C) 2018 Elsevier B.V. All rights reserved.
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