Effects of Biochar and Nitrogen Incorporation on Greenhouse Gas Emissions in Double Rice-cropping System
Received date: 2020-10-20
Online published: 2021-01-20
To investigate the effects of nitrogen （N） and biochar amendment on greenhouse gas emissions in double rice-cropping system. Five treatments were conducted: N0B0, no N fertilization without biochar amendment; N0B2, no N fertilization with 40 t/hm2 biochar; N1B0, N fertilization without biochar amendment; N1B1, N fertilization with 20 t/hm2 biochar; N1B2, N fertilization with 40 t/hm2 biochar. Methane （CH4） and nitrous oxide （N2O） emissions were measured using the static chamber-gas chromatography method during rice-growing seasons, and analyzed the effects of biochar and nitrogen fertilizer amendment on CH4 and N2O emissions, global warming potential, annual yield and greenhouse gas intensity. The results indicated that biochar amendment significantly decreased CH4 emission in treatments with or without N fertilizer. Compared with N1B0 treatment, CH4 emissions of N1B1 and N1B2 treatments were decreased by 32.43% and 41.1%, respectively. Biochar amendment significantly increased the cumulative N2O emissions under nitrogen application. Compared with N1B0 treatment, the cumulative emissions of N1B1 and N1B2 treatments were significantly increased by 109.93% and 106.54%, respectively. The global warming potential of each treatment can be ordered as: N1B0> N0B0> N0B2> N1B1> N1B2. After the late rice harvested, the soil pH value, total carbon and C/N showed an increasing trend with the increase of biochar application, and N1B2 treatment increased significantly compared to N1B0. In summary, compared with single application of nitrogen fertilizer and single application of biochar, combined application of biochar and nitrogen fertilizer is more conducive to carbon sequestration and emission reduction in the double-season paddy field in southern China. N1B2 treatment has the best effect among all the treatments. The study provided some references for mitigating greenhouse effect by incorporating biochar into paddy fields.
Key words： biochar; N fertilizer; double-season rice; greenhouse gas emission
Yong WANG, Rujie LÜ, Xing LI, Shuixiu HU, Qingyin SHANG . Effects of Biochar and Nitrogen Incorporation on Greenhouse Gas Emissions in Double Rice-cropping System[J]. China Rice, 2021 , 27(1) : 20 -26 . DOI: 10.3969/j.issn.1006-8082.2021.01.005
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