Chinese Journal OF Rice Science >
Effects of Water Regime on Yield-scaled Global Warming Potential Under Double Rice-Cropping System With Straw Returning
Received date: 2014-08-19
Revised date: 2014-11-06
Online published: 2015-03-10
This study provided an insight into a complete green house gases(GHG) accounting of global warming potential(GWP) as affected by water regime in typical double rice-cropping system with crop residue returning. The three water treatments included continuous flooding (F), flooding-midseason drainage-reflooding (F-D-F) and flooding-midseason drainage-reflooding-moist intermittent irrigation (F-D-F-M) in rice growing seasons. Methane and N2O fluxes were measured using static chamber method. The results showed that annual CH4 emissions ranged from 208.3 kg/hm2 for the F-D-F-M plots to 678.2 kg/hm2 for the F plots, being 60.6%-71.7% from late-rice season. The CH4 emission was significantly reduced by midseason drainage and intermittent irrigation in comparison with continuous flooding. Annual N2O emission was 4.75-8.19 kg/hm2 in the double rice-cropping system. Compared with the F plots, the N2O emission slightly reduced in the F-D-F plots, while it was remarkably increased in the F-D-F-M plots. Among treatments, the grain yields of early-rice and late-rice were 7.76-8.02 t/hm2 and 7.22-8.69 t/hm2, respectively. The GWP ranged from 7648.8 kg/hm2 for the F-D-F-M plots to 18471.8 kg/hm2 for the F plots in double rice-cropping system with crop residue returning. The GWP ranged from 0.48 kg/kg to 1.12 kg/kg, significantly reduced for the F-D-F and F-D-F-M plots as compared to F plots. Therefore, agricultural economic viability and GHGs mitigation can be simultaneously achieved by midseason drainage and intermittent irrigation instead of continuous waterlogging in the double rice-cropping system with crop residue returing.
Key words： water regime; methane; nitrous oxide; GWP; rice paddy
Qing-yin SHANG, Xiu-xia YANG, Chen CHENG, Kang LUO, Shan HUANG, Qing-hua SHI, Xiao-hua PAN, Yong-jun ZENG . Effects of Water Regime on Yield-scaled Global Warming Potential Under Double Rice-Cropping System With Straw Returning[J]. Chinese Journal OF Rice Science, 2015 , 29(2) : 181 -190 . DOI: 10.3969/j.issn.1001-7216.2015.02.010
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