| DOI: | 10.1016/j.jclepro.2020.120643
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| 论文题名: | Double paddy rice conversion to maize–paddy rice reduces carbon footprint and enhances net carbon sink |
| 作者: | Jiang Z.; Lin J.; Liu Y.; Mo C.; Yang J.
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| 刊名: | Journal of Cleaner Production
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| ISSN: | 9596526
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| 出版年: | 2020
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| 卷: | 258 | | 语种: | 英语
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| 英文关键词: | C sink
; CH4
; GHG emissions
; Upland–paddy rotation
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| Scopus关键词: | Budget control
; Carbon dioxide
; Gas emissions
; Global warming
; Grain (agricultural product)
; Greenhouse gases
; Manufacture
; Nitrogen fertilizers
; Comprehensive assessment
; Cropping systems
; Direct carbons
; Ecosystem carbons
; GHG emission
; Methane emissions
; Southeastern china
; Water scarcity
; Carbon footprint
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| 英文摘要: | Increasing water scarcity and demand for biofuels and fodder has resulted in a change to traditional farming cropping system from double paddy rice (early rice–late rice, sign as ERLR) to maize–paddy rice (spring maize–late rice, sign as SMLR) in Asia. Whether the introduction of SMLR would induce lower greenhouse gas (GHG) emissions and higher net carbon (C) sink remains unclear. The objective of this study is to conduct a comprehensive assessment of the C footprint and net ecosystem carbon budget (NECB) for ERLR and SMLR systems, based on a two–year (2017–2018) paddy field experiment in southeastern China. Results showed that introducing SMLR resulted in a slight decrease of grain yield by 3.78% in 2017 and a pronounced increase by 17.6% in 2018. The introduction of SMLR into ERLR significantly reduced the C footprint by 35.1–41.7%. This was attributed to spring maize having a 60.1–64.5% lower C footprint relative to early rice and the C footprint of later rice in SMLR being 17.7–19.0% lower than in ERLR. Methane emissions were the largest contributor to the C footprint in both cropping systems, accounting for 52.7–54.4% and 37.2–39.6% in ERLR and SMLR, respectively. This composition of C footprint was similar to that of early rice in ERLR and late rice in ERLR and SMLR. However, GHG emissions from the manufacture of nitrogen fertilizers were the largest fraction of the C footprint in spring maize production, accounting for 40.0–49.3%. Although SMLR resulted in a greater C output due to increased direct carbon dioxide emissions from soils (by 60.1–142%), the introduction of SMLR produced a higher C input. Furthermore, the increase of C input outweighed the increase of C output, leading to a significant increase of NECB by 80.1–147%. Results from this study demonstrate that the introduction of SMLR into ERLR is highly effective strategy for reducing C footprint and enhancing the net C sink as well as maintaining high grain yield. © 2020 Elsevier Ltd |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/158099
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| Appears in Collections: | 气候变化与战略
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作者单位: | Institute of Environment Pollution Control and Treatment, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China
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| Recommended Citation: | |
Jiang Z.,Lin J.,Liu Y.,et al. Double paddy rice conversion to maize–paddy rice reduces carbon footprint and enhances net carbon sink[J]. Journal of Cleaner Production,2020-01-01,258
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