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Effects of biochar combined with nitrification/urease inhibitors on soil active nitrogen emissions from subtropical paddy soils.
- Source :
- Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao; Apr2022, Vol. 33 Issue 4, p1027-1036, 10p
- Publication Year :
- 2022
-
Abstract
- We examined the effects of biochar and urease inhibitors/nitrification inhibitors on nitrification process, ammonia and N<subscript>2</subscript>O emission in subtropical soil, and determined the best combination of biochar with nitrification and urease inhibitors. This work could provide a theoretical basis for the mitigation of the negative environmental risk caused by reactive nitrogen gas in the application of nitrogen fertilizer. A indoor aerobic culture test was conducted with seven treatments [ urea+biochar (NB ), urea+nitrification inhibitor (N + NI), urea+urease inhibitor (N+UI), urea+nitrification inhibitor+urease inhibitor (N+NIUI), urea+nitrification inhibitor+biochar (NB+NI), urea+urease inhibitor+biochar (NB+UI), urea+nitrification inhibitor+urease inhibitor+biochar (NB+NIUI) ] and urea (N) as the control. The dynamics of soil inorganic nitrogen content, N<subscript>2</subscript>O emission and the volatility of ammonia volatilization were observed under combined application of biochar with urease inhibitor (NBPT) /nitrification inhibitor (DMPP). The results showed that: 1) Compared to the control (5.11 mg N · kg<superscript>-1</superscript> · d<superscript>-1</superscript>) during the incubation period, NB treatment significantly increased the rate constant of nitrification by 33.9%, and N+NI treatment significantly reduced the nitrification rate constant by 22.9%. NB treatment significantly increased the abundance of ammonia oxidizing bacteria (AOB) by 56.0%. 2) Compared with N treatment, N+NI and NB+NI treatments significantly enhanced the cumulative emission of NH<subscript>3</subscript> by 49%. The N + UI treatment reduced the cumulative loss of NH<subscript>3</subscript>. The inhibition effect of NB+UI treatment was more significant. 3) The emission rate of N<subscript>2</subscript>O was highest in the first 10 days after fertilization. The N<subscript>2</subscript>O emission under NB treatment was the earliest, and that of N treatment was the highest (5.87 µg · kg<superscript>-1</superscript> · h<superscript>-1</superscript>). The combined application of DMPP and NBPT performed the best in reducing soil N<subscript>2</subscript>O emission. We estimated global warming potential (GWP) of the direct N<subscript>2</subscript>O and indirect N<subscript>2</subscript>O (NH<subscript>3</subscript>) emissions. Compared with N treatments, N+NI and NB+NI treatments increased the GWP by 34.8% and 40.9%, respectively. While the NB and NB+UI treatments significantly reduced the GWP by 45.9% and 60.5%, the combination of biochar and urease inhibitor had the best effect on reduction of GWP of soil active nitrogen emissions. [ABSTRACT FROM AUTHOR]
Details
- Language :
- Chinese
- ISSN :
- 10019332
- Volume :
- 33
- Issue :
- 4
- Database :
- Supplemental Index
- Journal :
- Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao
- Publication Type :
- Academic Journal
- Accession number :
- 156570737
- Full Text :
- https://doi.org/10.13287/j.1001-9332.202204.017