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Influences of two irrigation systems on soil N2O emissions from vineyards in Ningxia, China
Received date: 2015-03-05
Revised date: 2015-10-26
Online published: 2016-03-15
Supported by
Supported by the Poverty and Environment Fund of Asian Development Bank(RETA-6422)
The system of furrow irrigation which can dissolve solid fertilisers in irrigation water (FIS) is widely applied in vineyards in Ningxia Hui autonomous region. Meanwhile the system of drip irrigation and fertigation (DIS) has also been employed in some areas. These irrigation systems may affect nitrous oxide (N2O) emissions from the soil. Therefore, it is important to study the differences in N2O emissions and identify farmland management methods that limit N2O emissions. During the July-August 2012 and July-September 2013 growing seasons, this study was conducted by using the static chamber-gas chromatograph technique to observe the soil N2O emissions from vineyards in Ningxia. The results showed that: the annual N2O emission reductions reached (18.24±2.79) kg/(hm-2 ·a-1) (61.1%) in 2012 and (3.37±0.37) kg/(hm-2 ·a-1) (78.9%) in 2013 by changing FIS for DIS. The annual reduction amounts of N2O emissions, estimated by using emission factor, were approximately 704 264-770 756 kg and 215 550-223 920 kg in 2012 and 2013, respectively, after changing FIS for DIS in the vineyards in Ningxia. In conclusion, DIS has greater reduction potential for N2O emissions in Ningxia vineyards.
Key words： drip irrigation; furrow irrigation; emission factor; vineyard; nitrous oxide
ZHANG Yajie , NIU Haishan . Influences of two irrigation systems on soil N2O emissions from vineyards in Ningxia, China[J]. Journal of University of Chinese Academy of Sciences, 2016 , 33(2) : 178 -186 . DOI: 10.7523/j.issn.2095-6134.2016.02.006
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