Effects of steel slag and biochar amendments on CO2, CH4, and N2O flux, and rice productivity in a subtropical Chinese paddy field
Publication in refereed journal

香港中文大學研究人員
替代計量分析
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其它資訊
摘要Steel slag, a by-product of the steel industry, contains high amounts of active iron oxide and silica which can act as an oxidizing agent in agricultural soils. Biochar is a rich source of carbon, and the combined application of biochar and steel slag is assumed to have positive impacts on soil properties as well as plant growth, which are yet to be validated scientifically. We conducted a field experiment for two rice paddies (early and late paddy) to determine the individual and combined effects of steel slag and biochar amendments on CO2, CH4, and N2O emission, and rice productivity in a subtropical paddy field of China. The amendments did not significantly affect rice yield. It was observed that CO2 was the main greenhouse gas emitted from all treatments of both paddies. Steel slag decreased the cumulative CO2 flux in the late paddy. Biochar as well as steel slag + biochar treatment decreased the cumulative CO2 flux in the late paddy and for the complete year (early and late paddy), while steel slag + biochar treatment also decreased the cumulative CH4 flux in the early paddy. The biochar, and steel slag + biochar amendments decreased the global warming potential (GWP). Interestingly, the cumulative annual GWP was lower for the biochar (55,422 kg CO2-eq ha(-1)), and steel slag + biochar (53,965 kg CO2-eq ha(-1)) treatments than the control (68,962 kg CO2-eq ha(-1)). Total GWP per unit yield was lower for the combined application of steel slag + biochar (8951 kg CO2-eq Mg-1 yield) compared to the control (12,805 kg CO2-eq Mg-1 yield). This study suggested that the combined application of steel slag and biochar could be an effective long-term strategy to reduce greenhouse gases emission from paddies without any detrimental effect on the yield.
著者Wang C, Wang W, Sardans J, Singla A, Zeng CS, Lai DYF, Peñuelas J
期刊名稱Environmental Geochemistry and Health
出版年份2019
月份6
卷號41
期次3
出版社Springer
頁次1419 - 1431
國際標準期刊號0269-4042
電子國際標準期刊號1573-2983
語言英式英語

上次更新時間 2021-06-12 於 23:35