Interaction between nitrification, denitrification and nitrous oxide production in fumigated soils. (February 2015)

• Record Type: Journal Article
• Authors: Yan, Dongdong; Wang, Qiuxia; Mao, Liangang; Ma, Taotao; Li, Yuan; Ouyang, Canbin; Guo, Meixia; Cao, Aocheng
• Is Part Of: Atmospheric environment. Volume 103(2015)
• Page Start: 82
• Page End: 86
• Publication Date: 2015-02
• Subjects: Soil fumigation -- Nitrification -- Denitrification -- Nitrous oxide -- Dissolved nitrogen; Pic chloropicrin -- 1, 3-D 1, 3-dichloropropene -- DMDS dimethyl disulfide -- DZ dazomet -- MBN microbial biomass nitrogen -- DAA dissolved amino acids -- PN potential nitrification -- PDN potential denitrification -- WAF week after fumigation -- wk week; Air -- Pollution -- Periodicals; Air -- Pollution -- Meteorological aspects -- Periodicals; 551.51
• DOI: 10.1016/j.atmosenv.2014.09.079
• Languages: English
• ISSNs: 1352-2310

Abstract

Abstract: Soil fumigation can increase mineral nitrogen due to the mineralization of soil microbial biomass killed during the fumigation, and as a result nitrous oxide (N2 O) emission would increase. In addition, a fumigant's impact on soil nitrification and denitrification would also alter the dynamics of N2 O production in fumigated soils. Laboratory incubation studies were conducted to quantify the dynamic changes in N2 O production following various fumigant treatments, and to determine the interaction between nitrification, denitrification and N2 O production in fumigated soils. Results showed a substantial increase in NH4 + –N and dissolved amino acids (DAA) during 7 days fumigation at 1WAF (week after fumigation). The application of fumigants caused significant inhibition of nitrification. However the results relating to potential denitrification were quite different. The rates of potential denitrification in chloropicrin (Pic) and dazomet (DZ) treatments at 1WAF were 3.5 and 5.6 times higher than the untreated control. Potential denitrification was greatly stimulated after Pic and DZ fumigation. The N2 O production rates in Pic and DZ fumigated soil were significantly higher than the untreated control at 1WAF in the tested soil type. The cumulative N2 O emissions in Pic and DZ fumigated soil were also significantly higher than the untreated control, but there were no significant differences among 1, 3-dichloropropene (1, 3-D), dimethyl disulfide (DMDS) and untreated control. A positive relationship between N2 O production and potential denitrification (PDN) was observed ( r = 0.951, P < 0.01). Pic and DZ are both nitrogenous compounds. The breakdown products of Pic and DZ would be available for microbial-aided denitrification reactions as nitrogen sources leading to N2 O production, indicating that Pic and DZ degradation stimulated denitrification activity responsible for soil N2 O production. Highlights: Fumigation increased soil ammonium content and inhibited nitrification process. Denitrification was greatly stimulated by the breakdown products of Pic and DZ. N2 O emissions in Pic and DZ fumigated soils are predominantly due to denitrification.