Combined effects of nitrogen fertilizer and biochar on greenhouse gas emissions and net ecosystem economic budget from a coastal saline rice field in southeastern China

Environmental Science and Pollution Research International
Liying SunYinglie Liu

Abstract

Biochar amendment has complex impacts on greenhouse gas emissions, crop production and economic benefit. However, few studies have comprehensively investigated the effects of biochar amendment in coastal saline rice fields. Thus, a biochar amendment field experiment was established in a coastal saline rice field in China to estimate the CH4 and N2O emissions, global warming potential (GWP), greenhouse gas intensity (GHGI), and net ecosystem economic budget (NEEB) of the biochar amendment during the rice growing season in 2017. There were six treatments (N0B0, N0B1, N0B2, N1B0, N1B1, N1B2) with different N fertilizer levels of 0 and 300 kg N ha-1 and biochar rates of 0, 20, and 40 t ha-1. The results showed that the application of N fertilizer increased N2O emissions and rice yield by 128.3% (p < 0.001) and 44.4% (p < 0.001), respectively, while decreased the GHGI by 20.5% (p < 0.01); additionally, there were no significant effects on the CH4 emissions and GWP compared with the treatments without N fertilizer. Although biochar amendment significantly increased the N2O emissions and rice yield by 13.7-38.1% and 31.5-34.9%, respectively, biochar amendment had no significant effects on CH4 emissions, GWP, and GHGI relative to the t...Continue Reading

References

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Jan 11, 2019·The Science of the Total Environment·Xiang LiuJie Ma

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