干旱区生态环境知识资源中心(Arid): Reducing Emissions From Degraded Floodplain Wetlands

Arid

DOI	10.3389/fenvs.2020.00008
	Reducing Emissions From Degraded Floodplain Wetlands
	Limpert, Katy E.; Carnell, Paul E.; Trevathan-Tackett, Stacey M.; Macreadie, Peter I.
通讯作者	Limpert, Katy E.
来源期刊	FRONTIERS IN ENVIRONMENTAL SCIENCE
EISSN	2296-665X
出版年	2020
卷号	8
英文摘要	Globally, freshwater wetlands are significant carbon sinks; however, altering a wetland's hydrology can reduce its ability to sequester carbon and may lead to the release of previously stored soil carbon. Rehabilitating a wetland's water table has the potential to restore the natural process of wetland soil carbon sequestration and storage. Further, little is known about the role of microbial communities that mediate carbon cycling during wetland rehabilitation practices. Here, we examined the carbon emissions and microbial community diversity during a wetland rehabilitation process known as environmental watering (rewetting) in an Australian, semi-arid freshwater floodplain wetland. By monitoring carbon dioxide (CO2) and methane (CH4) emissions during dry and wet phases of an environmental watering event, we determined that adding water to a degraded semi-arid floodplain wetland reduces carbon emissions by 28-84%. The watering event increased anoxic levels and plant growth in the aquatic zone of the wetland, which may correlate with lower carbon emissions during and after environmental watering due to lower anaerobic microbial decomposition processes and higher CO2 sequestration by vegetation. During the watering event, areas with higher inundation had lower CO2 emissions (5.15 +/- 2.50 g CO2 m(-2) day(-1)) compared to fringe areas surrounding the wetland (11.89 +/- 4.25 g CO2 m(-2) day(-1)). CH4 flux was inversely correlated with CO2 emissions during inundation periods, showing a 38% (0.013 +/- 0.061 g CO2-e m(-2) day(-1)) increase when water was present in the wetland. During the dry phases of environmental watering, there was CH4 uptake within the fringe and aquatic zones (-0.013 +/- 0.063 g CO2-e m(-2) day(-1)). A clear succession of soil microbial community was observed during the dry-wet phases of the environmental watering process. This suggests that wetland hydrology plays a large role in the microbial community structure of these wetland ecosystems, and is consequently linked to CO2 and CH4 emissions. Overall, the total carbon emissions (CO2 + CH4) were reduced within the wetland during and after the environmental watering event, due to increasing vegetative growth and subsequent CO2 sequestration. We, therefore, recommend environmental watering practices in this degraded arid wetland ecosystem to improve conditions for wetland carbon sequestration and storage. Further use of this management practice may improve wetland carbon storage across other arid freshwater wetland ecosystems with similar hydrologic regimes.
英文关键词	16S diversity carbon sequestration environmental watering floodplains greenhouse gas emissions microbial communities soil organic carbon
类型	Article
语种	英语
国家	Australia
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000517177000001
WOS关键词	GREENHOUSE-GAS EMISSIONS ; FRESH-WATER WETLANDS ; ORGANIC-CARBON ; METHANE EMISSIONS ; LONG-TERM ; SOIL RESPIRATION ; FLUXES ; DYNAMICS ; COMMUNITY ; NITROGEN
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/314543
作者单位	Deakin Univ, Ctr Integrat Ecol, Sch Life & Environm Sci, Burwood, Vic, Australia
推荐引用方式 GB/T 7714	Limpert, Katy E.,Carnell, Paul E.,Trevathan-Tackett, Stacey M.,et al. Reducing Emissions From Degraded Floodplain Wetlands[J],2020,8.
APA	Limpert, Katy E.,Carnell, Paul E.,Trevathan-Tackett, Stacey M.,&Macreadie, Peter I..(2020).Reducing Emissions From Degraded Floodplain Wetlands.FRONTIERS IN ENVIRONMENTAL SCIENCE,8.
MLA	Limpert, Katy E.,et al."Reducing Emissions From Degraded Floodplain Wetlands".FRONTIERS IN ENVIRONMENTAL SCIENCE 8(2020).