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Biochar-Induced Mitigation Potential of Greenhouse Gas Emissions Was Enhanced under High Soil Nitrogen Availability in Intensively-Irrigated Vegetable Cropping Systems.
- Source :
- Agronomy; Oct2022, Vol. 12 Issue 10, pN.PAG-N.PAG, 13p
- Publication Year :
- 2022
-
Abstract
- Intensive irrigation coupled with excessive nitrogen (N) fertilizer input has resulted in high soil greenhouse gas (GHG) emissions in vegetable cropping systems. Biochar as a soil amendment has been advocated as a desirable option to reduce GHG emissions in agricultural systems, but its interactive effects with soil N availability in vegetable systems have yet to be clarified. We performed a field study to examine how biochar interacts with N fertilizer in driving annual methane (CH<subscript>4</subscript>) and nitrous oxide (N<subscript>2</subscript>O) emissions from an intensively-irrigated greenhouse vegetable cropping system acting as both sources of atmospheric CH<subscript>4</subscript> and N<subscript>2</subscript>O in subtropical China. Biochar amendment significantly increased soil CH<subscript>4</subscript> emissions by 33% and 85%, while it decreased soil N<subscript>2</subscript>O emissions by 22% and 12% with and without N fertilizer input, respectively. Fertilizer N combination weakened the positive response of CH<subscript>4</subscript> to biochar while it enhanced the mitigation potential of biochar for N<subscript>2</subscript>O. Annual direct emission factors of fertilizer N for N<subscript>2</subscript>O were estimated to be 1.35% and 1.94% for the fields with and without biochar amendment, respectively. Annual flux-sustained global warming potential (SGWP) and greenhouse gas intensity (GHGI) were significantly decreased by biochar amendment, and this mitigation effect was enhanced with fertilizer N combination. Altogether, we highlight that biochar can reconcile higher yield and lower climatic impact in intensive vegetable cropping systems in subtropical China, particularly in vegetable soils with high N availability. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20734395
- Volume :
- 12
- Issue :
- 10
- Database :
- Complementary Index
- Journal :
- Agronomy
- Publication Type :
- Academic Journal
- Accession number :
- 159870761
- Full Text :
- https://doi.org/10.3390/agronomy12102249