globalchange  > 气候变化与战略
DOI: 10.1111/gcb.14529
Scopus ID: 2-s2.0-85058446282
Limited potential of harvest index improvement to reduce methane emissions from rice paddies
Author: Jiang Y.; Qian H.; Wang L.; Feng J.; Huang S.; Hungate B.A.; van Kessel C.; Horwath W.R.; Zhang X.; Qin X.; Li Y.; Feng X.; Zhang J.; Deng A.; Zheng C.; Song Z.; Hu S.; van Groenigen K.J.; Zhang W.
Source Publication: Global Change Biology
ISSN: 13541013
Publishing Year: 2019
Volume: 25, Issue:2
pages begin: 686
pages end: 698
Language: 英语
Keyword: climate change ; food security ; greenhouse gases ; meta-analysis ; water management
Scopus Keyword: climate change ; emission ; food security ; greenhouse gas ; meta-analysis ; methane ; paddy field ; rice ; water management
English Abstract: Rice is a staple food for nearly half of the world's population, but rice paddies constitute a major source of anthropogenic CH 4 emissions. Root exudates from growing rice plants are an important substrate for methane-producing microorganisms. Therefore, breeding efforts optimizing rice plant photosynthate allocation to grains, i.e., increasing harvest index (HI), are widely expected to reduce CH 4 emissions with higher yield. Here we show, by combining a series of experiments, meta-analyses and an expert survey, that the potential of CH 4 mitigation from rice paddies through HI improvement is in fact small. Whereas HI improvement reduced CH 4 emissions under continuously flooded (CF) irrigation, it did not affect CH 4 emissions in systems with intermittent irrigation (II). We estimate that future plant breeding efforts aimed at HI improvement to the theoretical maximum value will reduce CH 4 emissions in CF systems by 4.4%. However, CF systems currently make up only a small fraction of the total rice growing area (i.e., 27% of the Chinese rice paddy area). Thus, to achieve substantial CH 4 mitigation from rice agriculture, alternative plant breeding strategies may be needed, along with alternative management. © 2018 John Wiley & Sons Ltd
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Document Type: 期刊论文
Appears in Collections:气候变化与战略

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Jiang Y.,Qian H.,Wang L.,et al. Limited potential of harvest index improvement to reduce methane emissions from rice paddies[J]. Global Change Biology,2019-01-01,25(2)
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