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| Titel |
Trade-offs between high yields and greenhouse gas emissions in irrigation wheat cropland in China |
| VerfasserIn |
Z. L. Cui, L. Wu, Y. L. Ye, W. Q. Ma, X. P. Chen, F. S. Zhang |
| 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. 8 ; Nr. 11, no. 8 (2014-04-24), S.2287-2294 |
| Datensatznummer |
250117374
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| Publikation (Nr.) |
 copernicus.org/bg-11-2287-2014.pdf |
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| Zusammenfassung |
| Although the concept of producing higher yields with reduced greenhouse gas
(GHG) emissions is a goal that attracts increasing public and scientific
attention, the trade-off between high yields and GHG emissions in intensive
agricultural production is not well understood. Here, we hypothesize that
there exists a mechanistic relationship between wheat grain yield and GHG
emission, and that could be transformed into better agronomic management. A
total 33 sites of on-farm experiments were investigated to evaluate the
relationship between grain yield and GHG emissions using two systems
(conventional practice, CP; high-yielding systems, HY) of intensive winter
wheat (Triticum aestivum L.) in China. Furthermore, we discussed the
potential to produce higher yields with lower GHG emissions based on a survey
of 2938 farmers. Compared to the CP system, grain yield was 39%
(2352 kg ha−1) higher in the HY system, while GHG emissions increased
by only 10%, and GHG emission intensity was reduced by 21%. The
current intensive winter wheat system with farmers' practice had a median
yield and maximum GHG emission rate of 6050 kg ha−1 and
4783 kg CO2 eq ha−1, respectively; however, this system can be
transformed to maintain yields while reducing GHG emissions by 26%
(6077 kg ha−1, and 3555 kg CO2 eq ha−1). Further, the HY
system was found to increase grain yield by 39% with a simultaneous
reduction in GHG emissions by 18% (8429 kg ha−1, and
3905 kg CO2 eq ha−1, respectively). In the future, we suggest
moving the trade-off relationships and calculations from grain yield and GHG
emissions to new measures of productivity and environmental protection using
innovative management technologies. |
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