Effects of Biochar on the Net Greenhouse Gas Emissions under Continuous Flooding and Water-Saving Irrigation Conditions in Paddy Soils

Le Qi, Hai-Dong Niu, Peng Zhou, Rui-Jie Jia and Ming Gao
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Le Qi: College of Resources and Environment, Southwest University, Chongqing 400716, China
Hai-Dong Niu: College of Resources and Environment, Southwest University, Chongqing 400716, China
Peng Zhou: College of Resources and Environment, Southwest University, Chongqing 400716, China
Rui-Jie Jia: College of Resources and Environment, Southwest University, Chongqing 400716, China
Ming Gao: College of Resources and Environment, Southwest University, Chongqing 400716, China

Sustainability, 2018, vol. 10, issue 5, 1-17

Abstract: In this study, we investigated the greenhouse gas emission under different application of biochar in the conditions of continuous flooding and water-saving irrigation in paddy fields, whereas, plant and soil carbon sequestration were considered in the calculation of net greenhouse gas emissions. The emission rates of methane (CH 4 ), carbon dioxide (CO 2 ), and nitrous oxide (N 2 O) gases were simultaneously monitored once every 7–10 days using the closed-chamber method. As a whole, the net greenhouse gas emission in the water-saving irrigation was more than that of the continuous flooding irrigation conditions. Compared with the water-saving irrigation, the continuous flooding irrigation significantly increased the CH 4 in the control (CK) and chemical fertilizer treatments (NPK). The CO 2 emissions increased in each treatment of the water-saving irrigation condition, especially in the chemical fertilizer treatments (NPK FW ). Similarly, the soil N 2 O emission was very sensitive to the water-saving irrigation condition. An interesting finding is that the biochar application in soils cut down the soil N 2 O emission more significantly than NPK FW in the water-saving irrigation condition while the effect of biochar increased under the continuous flooding irrigation condition.

Keywords: biochar; water-saving irrigation; net greenhouse gas emissions; paddy soil (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (6)

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