DOI: 10.1016/j.still.2020.104598
论文题名: Straw recycling in rice paddy: Trade-off between greenhouse gas emission and soil carbon stock increase
作者: Lee J.H. ; Lee J.G. ; Jeong S.T. ; Gwon H.S. ; Kim P.J. ; Kim G.W.
刊名: Soil and Tillage Research
ISSN: 1671987
出版年: 2020
卷: 199 语种: 英语
英文关键词: Greenhouse gas intensity
; Methane
; Net ecosystem carbon budget
; Nitrous oxide
Scopus关键词: Budget control
; Economic and social effects
; Ecosystems
; Global warming
; Grain (agricultural product)
; Greenhouse gases
; Methane
; Mixing
; Nitrogen oxides
; Organic carbon
; Soils
; Aerobic decomposition
; Ecosystem carbons
; Global warming potential
; Heterotrophic respiration
; Net primary production
; Nitrous oxide
; Soil organic carbon
; Straw incorporations
; Magnesium
; carbon budget
; decomposition
; fallow
; global warming
; greenhouse gas
; methane
; nitrous oxide
; organic carbon
; paddy field
; primary production
; soil carbon
; soil respiration
; trade-off
英文摘要: A two-year field study was conducted in rice paddy to determine how straw incorporation influences net global warming potential (GWP) using the sum of methane (CH4) and nitrous oxide (N2O) fluxes and net ecosystem carbon budget (NECB), and greenhouse gas intensity (GHGI) using net GWP per unit of grain yield. Straw was applied by spreading over soil or mixing with soil during the dry fallow season and plowed right before flooding. In the control treatment, straw was removed for comparison. Soil organic carbon (SOC) stock changes were estimated by NECB, which means the difference between C input and output. Net primary production and applied straw were considered as C input source, and harvest C removal and heterotrophic respiration C loss were counted as C output. Straw removal depleted SOC stock at a range of 0.24–1.12 Mg C ha−1 yr−1, but straw application significantly increased SOC stock with the rate of 1.48–2.82 Mg C ha-1 yr-1. Straw spreading over soil was more effective than straw mixing with soil to increase SOC stock. However, straw application markedly increased GHG emission, in particular, CH4 emission by 27–263 % over straw removal. Between two straw treatments, annual CH4 fluxes were 25–50 % higher in straw spreading over soil than straw mixing with soil. However, the net GWP did not largely differ between straw spreading and straw removal, due to increased SOC stock. In comparison, straw mixing with soil could reduce the net GWP by 50–55 % over straw removal. Straw application increased grain yields by 7–26 % over straw removal. As a result, GHGI did not differ between straw spreading and straw removal, but was significantly lower in straw mixing with soil. Conclusively, straw application could be essential to increase SOC stock without GWP increase in rice paddy. In particular, the aerobic decomposition of straw during the dry fallow season by mixing with soil could reduce the net GWP by approximately 50–52 % over straw removal. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158296
Appears in Collections: 气候变化与战略
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作者单位: Division of Applied Life Science (BK 21+ Program), Gyeongsang National University, Jinju, 660-701, South Korea; Institute of Agriculture and Life Sciences, Gyeongsang National University, Jinju, 660-701, South Korea
Recommended Citation:
Lee J.H.,Lee J.G.,Jeong S.T.,et al. Straw recycling in rice paddy: Trade-off between greenhouse gas emission and soil carbon stock increase[J]. Soil and Tillage Research,2020-01-01,199