TITLE

优化施氮对宁夏引黄灌区稻田CO2、CH4和 N2O通量的影响

AUTHOR(S)
王永生; 张爱平; 刘汝亮; 杨世琦; 李存军
PUB. DATE
June 2016
SOURCE
Journal of Agro-Environment Science;2016, Vol. 35 Issue 6, p1218
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Excessive nitrogen(N) fertilizer application is a widespread practice in Yellow River water irrigation region of Ningxia. Previous studies have demonstrated that optimized N fertilization can not only improve rice yield but also reduce nitrogen leaching. However, there was little information available about the responses of soil greenhouse gas fluxes to optimized N fertilization in this region. A field experiment was conducted to evaluate the effects of different N fertilization on carbon dioxide(CO2), methane(CH4) and nitrous oxide(N2O) fluxes and global warming potential(GWP) in paddy field in Yellow River water irrigation region of Ningxia, using static chamber technique and gas chromatography. Treatments included conventional N fertilization(N300), optimized N fertilization(N240) and no N fertilization(N0). Our results showed obvious differences in greenhouse gas fluxes during the rice growth period. Higher CO2 emissions appeared at filling and mature stages, but CH4 emissions mainly occurred at booting stage. However, the peak of N2O emissions was observed at tillering and elongation stages. Applying nitrogen significantly increased soil CO2, CH4, and N2O emissions and the global warming potential. During the experimental period, average CO2, CH4, and N2O fluxes were 18 446.87 kg C·hm-2, 146.57 kg C·hm-2, and 2.93 kg N·hm-2, respectively. One-season optimized N fertilization did not affect CO2 emissions, but significantly reduced CH4 and N2O emissions by 24.42% and 36.28%, respectively, as compared with conventional N fertilization. Overall, our results indicate that the global warming potential of paddy field was significantly reduced by 26.70% by optimized N fertilization in Yellow River water irrigation region of Ningxia. Further research is needed to analyze the mechanisms of soil greenhouse gas fluxes under long-term optimized N fertilization by integrating the variations of soil organic carbon and N availability and soil microbiology methods.
ACCESSION #
118016666

 

Related Articles

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics