Carbon exchange fluxes over peatlands in Western Siberia: Possible feedback between land-use change and climate change

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Title:	Carbon exchange fluxes over peatlands in Western Siberia: Possible feedback between land-use change and climate change
Authors:	柯奧圖;Fleischer, Elisa;Khashimov, Ilhom;Hölzel, Norbert;Klemm, Otto
Contributors:	地球科學學院大氣科學學系
Keywords:	Agricultural sustainable intensification;carbon;Carbon balance;carbon cycle;carbon dioxide;carbon sinks;climate change;drainage;Eddy covariance;emissions;Former Soviet Union;grasslands;Greenhouse gas fluxes;greenhouse gases;Land conversion;land use change;melting;methane;methane production;oats;peat soils;peatlands;plant growth;Siberia;snowmelt;USSR
Date:	2016-03-01
Issue Date:	2026-04-21 14:12:18 (UTC+8)
Publisher:	Elsevier;Netherlands: Elsevier B.V
Abstract:	摘要： The growing demand for agricultural products has been leading to an expansion and intensification of agriculture around the world. More and more unused land is currently reclaimed in the regions of the former Soviet Union. Driven by climate change, the Western Siberian grain belt might, in a long-term, even expand into the drained peatland areas to the North. It is crucial to study the consequences of this land-use change with respect to the carbon cycling as this is still a major knowledge gap. We present for the first time data on the atmosphere-ecosystem exchange of carbon dioxide and methane of an arable field and a neighboring unused grassland on peat soil in Western Siberia. Eddy covariance measurements were performed over one vegetation period. No directed methane fluxes were found due to an effective drainage of the study sites. The carbon dioxide fluxes appeared to be of high relevance for the global carbon and greenhouse gas cycles. They showed very site-specific patterns resulting from the development of vegetation: the persistent plants of the grassland were able to start photosynthesizing soon after snow melt, while the absence of vegetation on the managed field lead to a phase of emissions until the oat plants started to grow in June. The uptake peak of the oat field is much later than that of the grassland, but larger due to a rapid plant growth. Budgeting the whole measurement period, the grassland served as a carbon sink, whereas the oat field was identified to be a carbon source. The conversion from non-used grasslands on peat soil to cultivated fields in Western Siberia is therefore considered to have a positive feedback on climate change. [Display omitted] •Grasslands on drained peat soil can act as carbon sinks.•Arable fields on drained peat act as carbon sources due to long phases of bare soil.•CH4 emissions from drained peatlands seem to play a smaller role than CO2 fluxes.•Conversion from grassland to arable field has a positive feedback on climate change.•Positive feedback between projected land-use change and climate change is suggested. 其他題名： Sci Total Environ 出版者： Netherlands: Elsevier B.V 出版日期： 2016-03-01 出處： The Science of the total environment, 2016-03, Vol.545-546, p.424-433 版權： 2015 Elsevier B.V. 版權： Copyright © 2015 Elsevier B.V. All rights reserved. 識別號： ISSN: 0048-9697 識別號： EISSN: 1879-1026 識別號： DOI: 10.1016/j.scitotenv.2015.12.073 識別號： PMID: 26748007
Appears in Collections:	[Department of Atmospheric Sciences] journal & Dissertation

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