Carbon dynamics and greenhouse gas outgassing in an estuarine mangrove wetland with high input of riverine nitrogen

被引:5
作者
Lu, Zeyang [1 ,2 ]
Wang, Fenfang [1 ,2 ]
Xiao, Kai [3 ]
Wang, Yao [1 ,2 ]
Yu, Qibiao [1 ,2 ]
Cheng, Peng [2 ]
Chen, Nengwang [1 ,2 ,4 ]
机构
[1] Xiamen Univ, Coll Environm & Ecol, Key Lab Coastal & Wetland Ecosyst, Xiamen, Peoples R China
[2] Xiamen Univ, State Key Lab Marine Environm Sci, Xiamen, Peoples R China
[3] Southern Univ Sci & Technol, Sch Environm Sci & Engn, State Environm Protect Key Lab Integrated Surface, Shenzhen, Peoples R China
[4] Xiamen Univ, Natl Observat & Res Stn Taiwan Strait Marine Ecosy, Zhangzhou, Peoples R China
基金
中国国家自然科学基金;
关键词
Coastal wetlands; Blue carbon; Denitrification; CO2-equivalent; Zhangjiang estuary; ORGANIC-CARBON; TIDAL CREEK; GROUNDWATER DISCHARGE; TEMPORAL VARIABILITY; DOMINATED ESTUARY; INORGANIC CARBON; WATER; METHANE; CO2; BIOGEOCHEMISTRY;
D O I
10.1007/s10533-022-00999-5
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The large amounts of organic carbon buried in mangrove wetlands are well recognized, but the lateral dissolved carbon export and greenhouse gas (GHGs) outgassing are often overlooked. In this study, we carried out seasonal observations of dissolved carbon and GHGs in an estuarine mangrove wetland with high input of riverine nitrogen in southeast China in 2019-2020. The results showed that the tidal range and season were the two main factors controlling the lateral dissolved carbon export including total alkalinity (TA), dissolved inorganic carbon (DIC) and dissolved organic carbon (DOC). The positive correlations between the average offsets of DIC, TA, DOC and tidal range confirmed the hydrological controls on the exchange of dissolved carbon between the mangrove creek and the estuary. The seasonal variability in temperature, groundwater export and freshwater input resulted in a larger carbon offset during low tidal range in spring and a smaller offset during high tidal range in fall. The mangrove creek acted as a net source of DIC, DOC, TA and GHGs. When the emissions of GHGs were calculated as CO2-equivalents, the average emission of CO2 was four times higher than that of N2O and the average emission of N2O was six times higher than that of CH4. In contrast with pristine mangroves, denitrification in mangrove wetlands with high input of riverine nitrogen played a crucial role in mineralization processes, leading to the production of DIC, TA and N2O. These biogeochemical processes may not be conducive to the blue carbon sequestration in mangrove soils. These findings suggested that there are mutual benefits between the reduced loss of blue carbon and the mitigation of eutrophication when restoring mangrove wetlands and reducing nitrogen pollution.
引用
收藏
页码:221 / 235
页数:15
相关论文
共 67 条
[1]   The Energetics of Mangrove Forests [J].
Adam, Paul .
AUSTRAL ECOLOGY, 2011, 36 (05) :E18-E19
[2]   Nitrogen Cycling and Mass Balance in the World's Mangrove Forests [J].
Alongi, Daniel M. .
NITROGEN, 2020, 1 (02) :167-189
[3]   Carbon Cycling in the World's Mangrove Ecosystems Revisited: Significance of Non-Steady State Diagenesis and Subsurface Linkages between the Forest Floor and the Coastal Ocean [J].
Alongi, Daniel M. .
FORESTS, 2020, 11 (09)
[4]   Carbon Cycling and Storage in Mangrove Forests [J].
Alongi, Daniel M. .
ANNUAL REVIEW OF MARINE SCIENCE, VOL 6, 2014, 6 :195-219
[5]  
Alongi DanielM., 1998, MAR SCI SER
[6]   Rapid sediment accumulation and microbial mineralization in forests of the mangrove Kandelia candel in the Jiulongjiang Estuary, China [J].
Alongi, DM ;
Pfitzner, J ;
Trott, LA ;
Tirendi, F ;
Dixon, P ;
Klumpp, DW .
ESTUARINE COASTAL AND SHELF SCIENCE, 2005, 63 (04) :605-618
[7]  
Atwood TB, 2017, NAT CLIM CHANGE, V7, P523, DOI [10.1038/nclimate3326, 10.1038/NCLIMATE3326]
[8]   Tidal dynamics and rainfall control N2O and CH4 emissions from a pristine mangrove creek [J].
Barnes, J. ;
Ramesh, R. ;
Purvaja, R. ;
Rajkumar, A. Nirmal ;
Kumar, B. Senthil ;
Krithika, K. ;
Ravichandran, K. ;
Uher, G. ;
Upstill-Goddard, R. .
GEOPHYSICAL RESEARCH LETTERS, 2006, 33 (15)
[9]   Biogeochemistry of nitrous oxide production in the red mangrove (Rhizophora mangle) forest sediments [J].
Bauza, JF ;
Morell, JM ;
Corredor, JE .
ESTUARINE COASTAL AND SHELF SCIENCE, 2002, 55 (05) :697-704
[10]   Spatial and temporal patterns of methane dynamics in the tropical mangrove dominated estuary, NE coast of Bay of Bengal, India [J].
Biswas, H. ;
Mukhopadhyay, S. K. ;
Sen, S. ;
Jana, T. K. .
JOURNAL OF MARINE SYSTEMS, 2007, 68 (1-2) :55-64