DOI: 10.1111/gcb.14477
Scopus记录号: 2-s2.0-85056779432
论文题名: Punching above their weight: Large release of greenhouse gases from small agricultural dams
作者: Ollivier Q.R. ; Maher D.T. ; Pitfield C. ; Macreadie P.I.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2019
卷: 25, 期: 2 起始页码: 721
结束页码: 732
语种: 英语
英文关键词: agriculture
; carbon dioxide
; dam
; emissions
; impoundment
; lake
; methane
Scopus关键词: agriculture
; carbon cycle
; carbon dioxide
; dam
; freshwater ecosystem
; greenhouse gas
; impoundment
; lake
; methane
英文摘要: Freshwater ecosystems play a major role in global carbon cycling through the breakdown of organic material and release of greenhouse gases (GHGs). Carbon dioxide (CO 2 ) and methane (CH 4 ) emissions from lakes, wetlands, reservoirs and small natural ponds have been well studied, however, the GHG emissions of highly abundant, small-scale (<0.01 km 2 ) agricultural dams (small stream and run-off impoundments) are still unknown. Here, we measured the diffusive CO 2 and CH 4 flux of 77 small agricultural dams within south-east Australia. The GHG emissions from these waterbodies, which are currently unaccounted for in GHG inventories, amounted to 11.12 ± 2.59 g CO 2 -equivalent m 2 /day, a value 3.43 times higher than temperate reservoir emissions. Upscaling these results to the entire state of Victoria, Australia, resulted in a farm dam CO 2 -equivalent/day emission rate of 4,853 tons, 3.1 times higher than state-wide reservoir emissions in spite of farm dams covering only 0.94 times the comparative area. We also show that CO 2 and CH 4 emission rates were both significantly positively correlated with dissolved nitrate concentrations, and significantly higher in livestock rearing farm dams when compared to cropping farm dams. The results from this study demonstrate that small agricultural farm dams can be a major source of greenhouse gas emissions, thereby justifying their inclusion in global carbon budgets. © 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/117529
Appears in Collections: 气候变化与战略
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Recommended Citation:
Ollivier Q.R.,Maher D.T.,Pitfield C.,et al. Punching above their weight: Large release of greenhouse gases from small agricultural dams[J]. Global Change Biology,2019-01-01,25(2)