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Simulated Nitrogen Deposition Reduces CH4 Uptake and Increases N2O Emission from a Subtropical Plantation Forest Soil in Southern China.
- Source :
- PLoS ONE; Apr2014, Vol. 9 Issue 4, p1-10, 10p
- Publication Year :
- 2014
-
Abstract
- To date, few studies are conducted to quantify the effects of reduced ammonium (NH<subscript>4</subscript><superscript>+</superscript>) and oxidized nitrate (NO<subscript>3</subscript><superscript>−</superscript>) on soil CH<subscript>4</subscript> uptake and N<subscript>2</subscript>O emission in the subtropical forests. In this study, NH<subscript>4</subscript>Cl and NaNO<subscript>3</subscript> fertilizers were applied at three rates: 0, 40 and 120 kg N ha<superscript>−1</superscript> yr<superscript>−1</superscript>. Soil CH<subscript>4</subscript> and N<subscript>2</subscript>O fluxes were determined twice a week using the static chamber technique and gas chromatography. Soil temperature and moisture were simultaneously measured. Soil dissolved N concentration in 0–20 cm depth was measured weekly to examine the regulation to soil CH<subscript>4</subscript> and N<subscript>2</subscript>O fluxes. Our results showed that one year of N addition did not affect soil temperature, soil moisture, soil total dissolved N (TDN) and NH<subscript>4</subscript><superscript>+</superscript>-N concentrations, but high levels of applied NH<subscript>4</subscript>Cl and NaNO<subscript>3</subscript> fertilizers significantly increased soil NO<subscript>3</subscript><superscript>−</superscript>-N concentration by 124% and 157%, respectively. Nitrogen addition tended to inhibit soil CH<subscript>4</subscript> uptake, but significantly promoted soil N<subscript>2</subscript>O emission by 403% to 762%. Furthermore, NH<subscript>4</subscript><superscript>+</superscript>-N fertilizer application had a stronger inhibition to soil CH<subscript>4</subscript> uptake and a stronger promotion to soil N<subscript>2</subscript>O emission than NO<subscript>3</subscript><superscript>−</superscript>-N application. Also, both soil CH<subscript>4</subscript> and N<subscript>2</subscript>O fluxes were driven by soil temperature and moisture, but soil inorganic N availability was a key integrator of soil CH<subscript>4</subscript> uptake and N<subscript>2</subscript>O emission. These results suggest that the subtropical plantation soil sensitively responses to atmospheric N deposition, and inorganic N rather than organic N is the regulator to soil CH<subscript>4</subscript> uptake and N<subscript>2</subscript>O emission. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 19326203
- Volume :
- 9
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- PLoS ONE
- Publication Type :
- Academic Journal
- Accession number :
- 95818216
- Full Text :
- https://doi.org/10.1371/journal.pone.0093571