Find in Library
Search millions of books, articles, and more
Indexed Open Access Databases
Trade-offs between high yields and greenhouse gas emissions in irrigation wheat cropland in China
oleh: Z. L. Cui, L. Wu, Y. L. Ye, W. Q. Ma, X. P. Chen, F. S. Zhang
Format: | Article |
---|---|
Diterbitkan: | Copernicus Publications 2014-04-01 |
Deskripsi
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 (<i>Triticum aestivum</i> 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<sup>−1</sup>) 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<sup>−1</sup> and 4783 kg CO<sub>2</sub> eq ha<sup>−1</sup>, respectively; however, this system can be transformed to maintain yields while reducing GHG emissions by 26% (6077 kg ha<sup>−1</sup>, and 3555 kg CO<sub>2</sub> eq ha<sup>−1</sup>). Further, the HY system was found to increase grain yield by 39% with a simultaneous reduction in GHG emissions by 18% (8429 kg ha<sup>−1</sup>, and 3905 kg CO<sub>2</sub> eq ha<sup>−1</sup>, 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.