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Effect of the biochar and manure combined application on greenhouse gas intensity and N2O emission factor from vegetable ecosystems*(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2019 06
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Effect of the biochar and manure combined application on greenhouse gas intensity and N2O emission factor from vegetable ecosystems*
JIAJunxiang1 XIONG Zhengqin2** MA Zhiyong1 XU Jianming1 WANG Ling1 & ZHANG Jing1
1 College of Resources and Environment, National Experimental Teaching Demonstration Center for Agricultural and Environment, Shanxi Agricultural University, Taigu 030801, China
2 Jiangsu Key Laboratory of Low Carbon Agriculture and GHGs Mitigation / College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China)
biochar manure vegetable field global warming potential greenhouse gas intensity N2O-N emission factor

A pot experiment was conducted to e xamine nitrous oxygen, methane and carbon dioxide emission, global warming potential, greenhouse gas intensity and N2O-N emission factor following the incorporation of biochar and manure into vegetable fields. The results showed that N2O fluxes drastically ranged from 0.02 to 1559.77μg m-2 h -1while CH 4 fluxes slightly changed from -0.09 to 0.25 mg m-2 h -1. Compared to N2O and CH4 emissions, CO 2 fluxes appeared almost similar fluctuations among the five treatments . The UB and UMB treatments significantly reduced N2O emissions, especially, the UMB treatment represented only 14.1% of N2O emissions in the U treatment. Nitrogen fertilizer, manure or biochar did not affect CH 4 emissions since no significant differences in cumulative CH 4 emissions were observed among five treatments. The biochar addition in the UB and UMB obviously produced higher CO 2 emissions than their corresponding U and UM treatments in in terms of cumulative CO 2 emissions, without obvious difference between the UB and UMB . Moreover, the UMB produced the highest yield in the choy sum and amaranth season, being 25.6% and 29.5% , respectively higher than the U treatment . Thus, the UMB gave the lowest GWP of 919 ± 266 kg/ hm 2 and GHGI of 0.04 ± 0.01 kg/kg except the control. Furthermore, the UMB produced the lowest N2O-N emission factor of 0.37%, being only 11.5% of that in the U treatment. In conclusion, the biochar and manure compost incorporation in the UMB not only suppressed N2O emissions, reduced GWP, GHGI and N2O-N emissions factor, but also decreased chemical N fertilizer input and maintain ed vegetable production , serving as our recommending fertilizer practice. Further studies are still required to explore the net global warming potential for biochar and manure applications considering their higher CO 2 emissions.




Last Update: 2019-04-15