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| Effects of Different Fertilization Practices on Greenhouse Gas Emissions from Paddy Soil |
| Received:November 05, 2014 |
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| KeyWord:greenhouse gas emission;CH4;CO2;N2O;soil microbial biomass C and N |
| Author Name | Affiliation | E-mail | | XIE Yi-qin | College of Resources and Environment, Sichuan Agricultural University, Chengdu 611130, China | | | ZHANG Jian-feng | Institute of Agricultural Resources and Regional Planning, CAAS, National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, China | | | JIANG Hui-min | Institute of Agricultural Resources and Regional Planning, CAAS, National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, China | | | YANG Jun-cheng | Institute of Agricultural Resources and Regional Planning, CAAS, National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, China | yangjuncheng@caas.cn | | DENG Shi-huai | College of Resources and Environment, Sichuan Agricultural University, Chengdu 611130, China | shdeng8888@163.com | | LI Xian | Hunan Academy of Agricultural Sciences, Changsha 410125, China | | | GUO Jun-mei | Institute of Agricultural Resources and Regional Planning, CAAS, National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, China | | | LI Ling-ling | Institute of Agricultural Resources and Regional Planning, CAAS, National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, China | | | LIU Xiao | Institute of Agricultural Resources and Regional Planning, CAAS, National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, China | | | ZHOU Gui-yu | Environment College, Liaoning University, Shenyang 110036, China | |
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| Abstract: |
| Paddy soil is an important source of greenhouse gases. Different fertilization methods may impact greenhouse gas emissions. In a pot experiment, a paddy soil of red soil under double cropping in Jiangxi Province was used to examine the emissions of greenhouse gases under local farmer fertilization practice(FP), organic nitrogen substitution for 20% of chemical nitrogen in FP(T1), Si, Zn and S additions to T1(T2), and slow release nitrogen substitution for 40% of chemical nitrogen in T2(T3). Soil microbial biomass carbon(SMBC), soil microbial biomass nitrogen(SMBN) and rice yield were also investigated. The results showed that total emission fluxes of CO2 were not significantly different between treatments. However, the total emission fluxes of N2O in T1, T2 and T3 treatments were significantly reduced(P<0.05) by 31.72%, 27.17%, and 43.65%, respectively, compare to that in FP. In the T1, T2, and T3 treatments, the total emission fluxes of CH4 were respectively 13.06%, 13.9% and 21.97% higher than in the FP treatment. Compared with FP, the SMBC and SMBN contents were increased by 18.91%, 19.30%, and 20.07%, and 28.95%, 31.66%, and 29.96%, respectively, for T1, T2 and T3. The rice yields did not show significant difference in T1, T2 and T3 treatments. The emission fluxes of CH4 and N2O in paddy soil had a significant correlation with SMBC and SMBN (P<0.01). Totally, T3 could significantly reduce the total emission fluxes of N2O and improve the soil SMBC and SMBN contents. |
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