Substrate quality overrides soil salinity in mediating microbial respiration in coastal wetlands

As productive and essential ecosystems, coastal wetlands have experienced increased environmental impacts such as saltwater intrusion and eutrophication, resulting in significant shifts in microbially mediated ecosystem functions, such as carbon sequestration and nutrient transformations. The soil m...

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Bibliographic Details
Published in:Land degradation & development 2023-09, Vol.34 (15), p.4546-4560
Main Authors: Li, Qiang, Song, Zhaoliang, Xia, Shaopan, Guo, Laodong, Singh, Bhupinder Pal, Shi, Yu, Wang, Weiqi, Luo, Yu, Li, Yongchun, Chen, Junhui, Zhang, Jianchao, Sun, Shaobo, Wang, Hailong
Format: Article
Language:English
Subjects:
Aquatic ecosystems
Biomass
Carbon
Carbon sequestration
Coastal ecosystems
Ecosystems
Environmental changes
Environmental impact
Enzymatic activity
Estuaries
Eutrophication
Metabolites
Microbiota
Microorganisms
Nutrient dynamics
Phosphorus
Respiration
Saline soils
Saline water
Saline water intrusion
Salinity
Salinity effects
Salt water intrusion
Secondary metabolites
Soil dynamics
Soil salinity
Substrates
Wetlands
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Summary:As productive and essential ecosystems, coastal wetlands have experienced increased environmental impacts such as saltwater intrusion and eutrophication, resulting in significant shifts in microbially mediated ecosystem functions, such as carbon sequestration and nutrient transformations. The soil microbial respiration, a primary process in the transfer of carbon from soil to the atmosphere, is susceptible to environmental changes. However, studies on how salinity affects soil microbial respiration in coastal wetlands have not been fully explored. Soil samples were systematically collected from divergent sampling sites covering medium‐ and extremely‐saline wetlands along a river‐estuary‐coast continuum to investigate mechanisms controlling soil microbial respiration in coastal wetlands. According to the results, the microbial biomass and carbon‐related extracellular enzyme activities were significantly lower in extremely saline (ECe >15 ds m −1 , ES) than medium and highly saline soils (ECe
ISSN:1085-3278
1099-145X
DOI:10.1002/ldr.4792