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Heterotrophic nitrification and denitrification are the main sources of nitrous oxide in two paddy soils
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Heterotrophic nitrification and denitrification are the main sources of nitrous oxide in two paddy soils
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Journal Article
Heterotrophic nitrification and denitrification are the main sources of nitrous oxide in two paddy soils
2019
Overview
Aims
Paddy soil is one of the main sources of global nitrous oxide (N
2
O) emissions via multiple pathways regulated by different microbes. However, the relative contributions of N
2
O production pathways with the addition of organic carbon (C) in different paddy soils are poorly understood.
Methods
15
N-stable isotope and acetylene (C
2
H
2
) inhibition were used to differentiate the relative contributions of autotrophic and heterotrophic nitrification (ANF and HNF) and denitrification (DNF) to N
2
O emissions in two paddy soils (acid vs. neutral soil) with glucose addition.
Results
HNF and DNF were the main N
2
O pathways which contributed between 85% to 100% of the total N
2
O production at 70% water filled pore space. Low soil pH inhibited soil nitrification and the activity of ammonia oxidizers compared with neutral paddy soil. Glucose reduced nitrification rate and stimulated N
2
O production significantly, mainly via DNF in the two paddy soils. Moreover, glucose increased the relative contribution of DNF to total N
2
O production in the first 7 days and total N
2
O amounts from HNF over the 14-day incubation.
Conclusions
HNF and DNF rather than ANF dominated the N
2
O emissions regardless of soil pH. Glucose had a positive effect on N
2
O emissions by influencing HNF and DNF.
