Effects of soil type and nitrate concentration on denitrification products (N2O and N2) under flooded conditions in laboratory microcosms

Thi Kim Thanh Ha, Morihiro Maeda, Taku Fujiwara, Hideaki Nagare, Satoshi Akao

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Denitrification products nitrous oxide ((N2O) and nitrogen (N2)) were measured in three flooded soils (paddy soil from Vietnam, PV; mangrove soil from Vietnam, MV; paddy soil from Japan, PJ) with different nitrate (NO3 ) concentrations. Closed incubation experiments were conducted in 100-mL bottles for 7 d at 25°C. Each bottle contained 2 g of air-dried soil and 25 mL solution with NO3 (concentration 0, 5 or 10 mg N L−1) with or without acetylene (C2H2). The N2O + N2 emissions were estimated by the C2H2 inhibition method. Results showed that N2O + N2 emissions for 7 d were positively correlated with those of NO3 removal from solution with C2H2 (R2 = 0.9872), indicating that most removed NO3 was transformed to N2O and N2 by denitrification. In PJ soil, N2O and N2 emissions were increased significantly (P < 0.05) by the addition of greater NO3 concentrations. However, N2O and N2 emissions from PV and MV soils were increased by the addition of 0 to 5 mg N L−1, but not by 5 to 10 mg N L−1. At 10 mg N L−1, N2 emissions for 7 d were greater in PJ soil (pH 7.0) than in PV (pH 5.8) or MV (pH 4.3) soils, while N2O emissions were higher in PV and MV soils than in PJ soil. In MV soil, N2O was the main product throughout the experiment. In conclusion, NO3 concentration and soil pH affected N2O and N2 emissions from three flooded soils.

Original languageEnglish
Pages (from-to)999-1004
Number of pages6
JournalSoil Science and Plant Nutrition
Volume61
Issue number6
DOIs
Publication statusPublished - Nov 2 2015

Keywords

  • acetylene inhibition method
  • denitrification
  • flooded soil
  • nitrate removals
  • nitrous oxide

ASJC Scopus subject areas

  • Soil Science
  • Plant Science

Fingerprint Dive into the research topics of 'Effects of soil type and nitrate concentration on denitrification products (N<sub>2</sub>O and N<sub>2</sub>) under flooded conditions in laboratory microcosms'. Together they form a unique fingerprint.

  • Cite this