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| Titel |
Impacts of rice varieties and management on yield-scaled greenhouse gas emissions from rice fields in China: A meta-analysis |
| VerfasserIn |
H. Zheng, H. Huang, L. Yao, J. Liu, H. He, J. Tang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 11, no. 13 ; Nr. 11, no. 13 (2014-07-10), S.3685-3693 |
| Datensatznummer |
250117510
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| Publikation (Nr.) |
 copernicus.org/bg-11-3685-2014.pdf |
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| Zusammenfassung |
| Increasing numbers of studies have suggested that a comprehensive assessment
of the impacts of cropping practices on greenhouse gas (GHG) emissions per
unit yield (yield-scaled), rather than by land area (area-scaled), is needed
to inform trade-off decisions to increase yields and reduce GHG emissions. We
conducted a meta-analysis to quantify impacts of rice varieties on the global
warming potential (GWP) of GHG emissions at the yield scale in China. Our
results showed that significantly higher yield-scaled GWP occurred with
indica rice varieties (1101.72 kg CO2 equiv. Mg−1) than
japonica rice varieties (711.38 kg CO2 equiv. Mg−1). Lower
yield-scaled GHG emissions occurred within 120–130 days of growth duration
after transplanting (GDAT; 613.66 kg CO2 equiv. Mg−1), followed
by 90–100 days of GDAT (749.72 kg CO2 equiv. Mg−1, 100–110
days of GDAT (794.29 kg CO2 equiv. Mg−1), and 70–80 days of
GDAT (800.85 kg CO2 equiv. Mg−1). The fertilizer rate of
150–200 kg N ha−1 resulted in the lowest yield-scaled GWP.
Consequently, appropriate cultivar choice and pairs were of vital importance
in the rice cropping system. A further life cycle assessment of GHG emissions
among rice varieties at the yield scale is urgently needed to develop
win–win policies for rice production to achieve higher yield with lower
emissions. |
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