干旱区生态环境知识资源中心(Arid): Assessing passive rehabilitation for carbon gains in rain-filled agricultural wetlands

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DOI	10.1016/j.jenvman.2019.109971
	Assessing passive rehabilitation for carbon gains in rain-filled agricultural wetlands
	Treby, Sarah; Carnell, Paul E.; Trevathan-Tackett, Stacey M.; Bonetti, Giuditta; Macreadie, Peter, I
通讯作者	Treby, Sarah
来源期刊	JOURNAL OF ENVIRONMENTAL MANAGEMENT
ISSN	0301-4797
EISSN	1095-8630
出版年	2020
卷号	256
英文摘要	Wetland ecosystems have a disproportionally large influence on the global carbon cycle. They can act as carbon sinks or sources depending upon their location, type, and condition. Rehabilitation of wetlands is gaining popularity as a nature-based approach to helping mitigate climate change; however, few studies have empirically tested the carbon benefits of wetland restoration, especially in freshwater environments. Here we investigated the effects of passive rehabilitation (i.e. fencing and agricultural release) of 16 semi-arid rain-filled freshwater wetlands in southeastern Australia. Eight control sites were compared with older (>10 year) or newer (2-5 year) rehabilitated sites, dominated by graminoids or eucalypts. Carbon stocks (soils and plant biomass), and emissions (carbon dioxide - CO2; and methane - CH4) were sampled across three seasons, representing natural filling and drawdown, and soil microbial communities were sampled in spring. We found no significant difference in soil carbon or greenhouse gas emissions between rehabilitated and control sites, however, plant biomass was significantly higher in older rehabilitated sites. Wetland carbon stocks were 19.21 t C-org h a(-1) and 2.84 t C-org ha(-1) for soils (top 20 cm; n = 137) and plant biomass (n = 288), respectively. Hydrology was a strong driver of wetland greenhouse gas emissions. Diffusive fluxes (n = 356) averaged 117.63 mmol CO2 m(2) d(-1) and 2.98 mmol CH4 m(2) d(-1) when wet, and 124.01 mmol CO2 m(2) d(-1) and -0.41 mmol CH4 m(2) d(-1) when dry. Soil microbial community richness was nearly 2-fold higher during the wet phase than the dry phase, including relative increases in Nitrososphaerales, Myxococcales and Koribacteraceae and methanogens Methanobacteriales. Vegetation type significantly influenced soil carbon, aboveground carbon, and greenhouse gas emissions. Overall, our results suggest that passive rehabilitation of rain-filled wetlands, while valuable for biodiversity and habitat provisioning, is ineffective for increasing carbon gains within 20 years. Carbon offsetting opportunities may be better in systems with faster sediment accretion. Active rehabilitation methods, particularly that reinstate the natural hydrology of drained wetlands, should also be considered.
英文关键词	Carbon sequestration Depressional Freshwater wetland 16S amplicon sequencing Land use Restoration
类型	Article
语种	英语
国家	Australia
收录类别	SCI-E
WOS记录号	WOS:000515200400034
WOS关键词	GREENHOUSE-GAS EMISSIONS ; FRESH-WATER WETLAND ; 16S RIBOSOMAL-RNA ; CH4 FLUXES ; LONG-TERM ; SOIL PROPERTIES ; CLIMATE-CHANGE ; ECOLOGICAL OUTCOMES ; COMMUNITY STRUCTURE ; METHANE EMISSIONS
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/2XILL650/314939
作者单位	Deakin Univ, Ctr Integrat Ecol, Sch Life & Environm Sci, Geelong, Vic, Australia
推荐引用方式 GB/T 7714	Treby, Sarah,Carnell, Paul E.,Trevathan-Tackett, Stacey M.,et al. Assessing passive rehabilitation for carbon gains in rain-filled agricultural wetlands[J],2020,256.
APA	Treby, Sarah,Carnell, Paul E.,Trevathan-Tackett, Stacey M.,Bonetti, Giuditta,&Macreadie, Peter, I.(2020).Assessing passive rehabilitation for carbon gains in rain-filled agricultural wetlands.JOURNAL OF ENVIRONMENTAL MANAGEMENT,256.
MLA	Treby, Sarah,et al."Assessing passive rehabilitation for carbon gains in rain-filled agricultural wetlands".JOURNAL OF ENVIRONMENTAL MANAGEMENT 256(2020).