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Nitrous Oxide and Methane Emissions in Spring Maize Field in the Semi-Arid Regions of Loess Plateau.
- Source :
- CLEAN: Soil, Air, Water; Jan2017, Vol. 45 Issue 1, pn/a-N.PAG, 13p
- Publication Year :
- 2017
-
Abstract
- A 2-year field study was conducted to measure nitrous oxide (N<subscript>2</subscript>O) and methane (CH<subscript>4</subscript>) in a rain-fed spring maize cropland in the Loess Plateau, P. R. China, and to determine the effects of optimized nitrogen (N) fertilization practices on urea-derived N<subscript>2</subscript>O emission factor (EF), grain yield, net greenhouse gas (NGHG) emission, and net greenhouse gas intensity (NGHGI). Five treatments were considered, including control (CK), conventional N fertilization (Con), optimal N fertilization (Opt), optimal N fertilization plus nitrification inhibitor (Opt + DCD), and optimal N fertilization with slow release urea (Opt + SR). Soil acted as a small sink for atmospheric CH<subscript>4</subscript>. Nitrogen fertilization and heavy rainfall events (>40 mm) were the main factors controlling N<subscript>2</subscript>O emissions. The annual mean EF ranged from 0.12 to 0.55%. Compared to conventional N fertilizer, nitrification inhibitor decreased the annual cumulative N<subscript>2</subscript>O, NGHG, and NGHGI emissions by 45, 52, and 48%, respectively, without decreasing grain yield. In conclusion, nitrification inhibitor addition was the most effective practice to reduce N<subscript>2</subscript>O emissions in the rain-fed regions of Loess Plateau. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 18630650
- Volume :
- 45
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- CLEAN: Soil, Air, Water
- Publication Type :
- Academic Journal
- Accession number :
- 120688978
- Full Text :
- https://doi.org/10.1002/clen.201500271