DOI: 10.1111/gcb.14529
Scopus记录号: 2-s2.0-85058446282
论文题名: Limited potential of harvest index improvement to reduce methane emissions from rice paddies
作者: 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.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2019
卷: 25, 期: 2 起始页码: 686
结束页码: 698
语种: 英语
英文关键词: climate change
; food security
; greenhouse gases
; meta-analysis
; water management
Scopus关键词: climate change
; emission
; food security
; greenhouse gas
; meta-analysis
; methane
; paddy field
; rice
; water management
英文摘要: 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 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117510
Appears in Collections: 气候变化与战略
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Recommended Citation:
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)