Processes and factors controlling N2O production in an intensively managed low carbon calcareous soil under sub-humid monsoon conditions

Xiaotang Ju, Xing Lu, Zhiling Gao, Xinping Chen, Fang Su, Martin Kogge, Volker Römheld, Peter Christie, Fusuo Zhang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

166 Citations (Scopus)
399 Downloads (Pure)

Abstract

An automated system for continuous measurement of N2O fluxes on an hourly basis was employed to study N2O emissions in an intensively managed low carbon calcareous soil under sub-humid temperate monsoon conditions. N2O emissions occurred mainly within two weeks of application of NH4+-based fertilizer and total N2O emissions in wheat (average 0.35 or 0.21 kg N ha−1 season−1) and maize (average 1.47 or 0.49 kg N ha−1 season−1) under conventional and optimum N fertilization (300 and 50–122 kg N ha−1, respectively) were lower than previously reported from low frequency measurements. Results from closed static chamber showed that N2O was produced mainly from nitrification of NH4+-based fertilizer, with little denitrification occurring due to limited readily oxidizable carbon and low soil moisture despite consistently high soil nitrate-N concentrations. Significant reductions in N2O emissions can be achieved by optimizing fertilizer N rates, using nitrification inhibitors, or changing from NH4+- to NO3ˉ-based fertilizers.

Original languageEnglish
Pages (from-to)1007-1016
JournalEnvironmental Pollution
Volume159
Issue number4
Early online date19 Jan 2011
DOIs
Publication statusPublished - Apr 2011
Externally publishedYes

ASJC Scopus subject areas

  • Pollution
  • Health, Toxicology and Mutagenesis
  • Toxicology

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