Jun Shan Xiaoyuan Yan. Effects of crop residue returning on nitrous oxide emissions in agricultural soils. Atmospheric Environment2013 DOI:10.1016-j.atmosenv.2013.02.009

Abstract

Crop residue returning is a common practice in agricultural system that consequently influences nitrous oxide (N₂O) emissions. Much attention has been focused on the effects of crop residue on N₂O release. However no systematic result has yet been drawn because environmental factors among different studies vary. A meta-analysis was described to integrate 112 scientific assessments of crop residue returning on N₂O emissions in this study. Results showed that crop residue returning when averaged across all studies had no statistically significant effect on N₂O release compared with control treatments. However the range of effects of crop residue returning on N₂O emission was significantly affected by synthetic nitrogen (N) fertilizer application type of crop residue specific manner in which crop residue has returned and types of land-use. N₂O release was significantly inhibited by 11.7% and 27.1% (P <0.05) when crop residue was with synthetic N fertilizer and when type of land-use was paddy respectively. While N₂O emissions were significantly enhanced by 42.1% and 23.5% (P <0.05) when crop residue was applied alone and when type of land-use was upland respectively. N₂O emissions were likewise increased when crop residue with lower C-N ratio was used mulching of crop residue was performed and type of land-use was fallow. Our study provides the first quantitative analysis of crop residue returning on N₂O emissions indicating that crop residue returning has no statistically significant effect on N₂O release at regional scale and underlining that the Intergovernmental Panel on Climate Change guidelines should take the opposite effects of crop residue returning on upland and paddy into account when estimating the N₂O emission factor of crop residue for different land-use types. Given that most of data are dominated by certain types of crop residue and specific application methods more field data are required to reduce uncertainty.