The Responses of Soil N 2 O Emissions to Residue Returning Systems: A Meta-Analysis

Naijuan Hu, Qian Chen and Liqun Zhu
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Naijuan Hu: Institute of Regional Agricultural Research, Nanjing Agricultural University, Nanjing 210095, China
Qian Chen: Institute of Regional Agricultural Research, Nanjing Agricultural University, Nanjing 210095, China
Liqun Zhu: Institute of Regional Agricultural Research, Nanjing Agricultural University, Nanjing 210095, China

Sustainability, 2019, vol. 11, issue 3, 1-17

Abstract: Background: Much attention has been focused on the influences of residue returning on N 2 O emissions. However, comprehensive quantification of the effect size on N 2 O emission following crop residue returning in subtropical, tropical and warm temperate conditions remains untested. Methods: To identify site-specific factors that influence N 2 O emission (kg N 2 O-N ha −1 ) in residue returning systems, we performed a meta-analysis involving 260 comparisons from 72 studies. Results: The data indicated that significant promoting effects were observed under residue returning by rotary tillage, no-tillage and mulch, whereas N 2 O release was significantly inhibited by 8% under residue returning by plough. For other contributors, the stimulatory and significant effects occurred in upland fields, under short- and medium-term residue returning durations, acidic/neutral soils, medium organic C and clay content. Nitrogen fertilizer application significantly stimulated N 2 O emission, even though application rate at 100–150 kg N ha −1 was inhibitory. Although a negative correlation between residue C/N ratio and N 2 O emission has been shown, residue returning could not reduce N 2 O emission with a higher C/N ratio and amount. Conclusions: Some options, such as converting residue returning methods, decreasing N fertilizer application rate, and regulating soil C/N ratio could be adopted to mitigate soil N 2 O emission following residue returning.

Keywords: residue returning; N 2 O emission; land use; soil properties; N fertilizer application; meta-analysis (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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