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Nitrate leaching, direct and indirect nitrous oxide fluxes from sloping cropland in the purple soil area, southwestern China.
- Source :
- Environmental Pollution; Mar2012, Vol. 162, p361-368, 8p
- Publication Year :
- 2012
-
Abstract
- This study provides a combined dataset on N loss pathways and fluxes from sloping cropland in the purple soil area, southwestern China. A lysimeter experiment was conducted to quantify nitrate leaching (May 2004–May 2010) and N<subscript>2</subscript>O emission (May 2009–May 2010) losses. Nitrate leaching was the dominant N loss pathway and annual leaching fluxes ranged from 19.2 to 53.4 kg N ha<superscript>−1</superscript>, with significant differences between individual observation years (P < 0.05). Direct N<subscript>2</subscript>O emissions due to N fertilizer use were 1.72 ± 0.34 kg N ha<superscript>−1</superscript> yr<superscript>−1</superscript>, which corresponds to an emission factor of 0.58 ± 0.12%. However, indirect N<subscript>2</subscript>O emissions caused by nitrate leaching and surface runoff N losses, may contribute another 0.15–0.42 kg N ha<superscript>−1</superscript> yr<superscript>−1</superscript>. Our study shows that nitrate leaching lowered direct N<subscript>2</subscript>O emissions, highlighting the importance for a better understanding of the tradeoff between direct and indirect N<subscript>2</subscript>O emissions for the development of meaningful N<subscript>2</subscript>O emission strategies. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 02697491
- Volume :
- 162
- Database :
- Supplemental Index
- Journal :
- Environmental Pollution
- Publication Type :
- Academic Journal
- Accession number :
- 70873867
- Full Text :
- https://doi.org/10.1016/j.envpol.2011.12.001