Soil microbial communities regulate the threshold effect of salinity stress on SOM decomposition in coastal salt marshes
Salinity stress is one of the critical environmental drivers of soil organic matter (SOM) decomposition in coastal ecosystems. Although the temperature sensitivity (Q10) of SOM decomposition has been widely applied in Earth system models to forecast carbon processes, the impact of salinity on SOM de...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co. Ltd.
2023-11-01
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| Series: | Fundamental Research |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2667325823000766 |
| _version_ | 1797454301808820224 |
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| author | Guangliang Zhang Junhong Bai Jia Jia Wei Wang Dawei Wang Qingqing Zhao Chen Wang Guozhu Chen |
| author_facet | Guangliang Zhang Junhong Bai Jia Jia Wei Wang Dawei Wang Qingqing Zhao Chen Wang Guozhu Chen |
| author_sort | Guangliang Zhang |
| collection | DOAJ |
| description | Salinity stress is one of the critical environmental drivers of soil organic matter (SOM) decomposition in coastal ecosystems. Although the temperature sensitivity (Q10) of SOM decomposition has been widely applied in Earth system models to forecast carbon processes, the impact of salinity on SOM decomposition by restructuring microbial communities remains uncovered. Here, we conducted a microcosm experiment with soils collected from the coastal salt marsh in the Yellow River Estuary, which is subjected to strong dynamics of salinity due to both tidal flooding and drainage. By setting a gradient of salt solutions, soil salinity was adjusted to simulate salinity stress and soil carbon emission (CO2) rate was measured over the period. Results showed that as salinity increased, the estimated decomposition constants based on first-order kinetics gradually decreased at different temperatures. Below the 20‰ salinity treatments, which doubled the soil salinity, Q10 increased with increasing salinity; but higher salinity constrained the temperature-related response of SOM decomposition by inhibiting microbial growth and carbon metabolisms. Soil bacteria were more sensitive to salinity stress than fungi, which can be inferred from the response of microbial beta-diversity to changing salinity. Among them, the phylotypes assigned to Gammaproteobacteria and Bacilli showed higher salt tolerance, whereas taxa affiliated with Alphaproteobacteria and Bacteroidota were more easily inhibited by the salinity stress. Several fungal taxa belonging to Ascomycota had higher adaptability to the stress. As the substrate was consumed with the incubation, bacterial competition intensified, but the fungal co-occurrence pattern changed weakly during decomposition. Collectively, these findings revealed the threshold effect of salinity on SOM decomposition in coastal salt marshes and emphasized that salt stress plays a key role in carbon sequestration by regulating microbial keystone taxa, metabolisms, and interactions. |
| first_indexed | 2024-03-09T15:35:19Z |
| format | Article |
| id | doaj.art-b50d089414fa49ba913c1b26d2a6e9e9 |
| institution | Directory Open Access Journal |
| issn | 2667-3258 |
| language | English |
| last_indexed | 2024-03-09T15:35:19Z |
| publishDate | 2023-11-01 |
| publisher | KeAi Communications Co. Ltd. |
| record_format | Article |
| series | Fundamental Research |
| spelling | doaj.art-b50d089414fa49ba913c1b26d2a6e9e92023-11-26T05:14:31ZengKeAi Communications Co. Ltd.Fundamental Research2667-32582023-11-0136868879Soil microbial communities regulate the threshold effect of salinity stress on SOM decomposition in coastal salt marshesGuangliang Zhang0Junhong Bai1Jia Jia2Wei Wang3Dawei Wang4Qingqing Zhao5Chen Wang6Guozhu Chen7State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China; Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai 519087, ChinaState Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China; Corresponding author.Henan Key Laboratory of Ecological Environment Protection and Restoration of Yellow River Basin, Yellow River Institute of Hydraulic Research, Zhengzhou 450003, ChinaState Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, ChinaState Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, ChinaShandong Provincial Key Laboratory of Applied Microbiology, Ecology Institute, Qilu University of Technology (Shandong Academy of Sciences), Ji'nan 250103, ChinaState Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, ChinaState Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, ChinaSalinity stress is one of the critical environmental drivers of soil organic matter (SOM) decomposition in coastal ecosystems. Although the temperature sensitivity (Q10) of SOM decomposition has been widely applied in Earth system models to forecast carbon processes, the impact of salinity on SOM decomposition by restructuring microbial communities remains uncovered. Here, we conducted a microcosm experiment with soils collected from the coastal salt marsh in the Yellow River Estuary, which is subjected to strong dynamics of salinity due to both tidal flooding and drainage. By setting a gradient of salt solutions, soil salinity was adjusted to simulate salinity stress and soil carbon emission (CO2) rate was measured over the period. Results showed that as salinity increased, the estimated decomposition constants based on first-order kinetics gradually decreased at different temperatures. Below the 20‰ salinity treatments, which doubled the soil salinity, Q10 increased with increasing salinity; but higher salinity constrained the temperature-related response of SOM decomposition by inhibiting microbial growth and carbon metabolisms. Soil bacteria were more sensitive to salinity stress than fungi, which can be inferred from the response of microbial beta-diversity to changing salinity. Among them, the phylotypes assigned to Gammaproteobacteria and Bacilli showed higher salt tolerance, whereas taxa affiliated with Alphaproteobacteria and Bacteroidota were more easily inhibited by the salinity stress. Several fungal taxa belonging to Ascomycota had higher adaptability to the stress. As the substrate was consumed with the incubation, bacterial competition intensified, but the fungal co-occurrence pattern changed weakly during decomposition. Collectively, these findings revealed the threshold effect of salinity on SOM decomposition in coastal salt marshes and emphasized that salt stress plays a key role in carbon sequestration by regulating microbial keystone taxa, metabolisms, and interactions.http://www.sciencedirect.com/science/article/pii/S2667325823000766Salt marshesSalinity stressSoil organic matter decompositionTemperature sensitivityThreshold effectMicrobial community |
| spellingShingle | Guangliang Zhang Junhong Bai Jia Jia Wei Wang Dawei Wang Qingqing Zhao Chen Wang Guozhu Chen Soil microbial communities regulate the threshold effect of salinity stress on SOM decomposition in coastal salt marshes Fundamental Research Salt marshes Salinity stress Soil organic matter decomposition Temperature sensitivity Threshold effect Microbial community |
| title | Soil microbial communities regulate the threshold effect of salinity stress on SOM decomposition in coastal salt marshes |
| title_full | Soil microbial communities regulate the threshold effect of salinity stress on SOM decomposition in coastal salt marshes |
| title_fullStr | Soil microbial communities regulate the threshold effect of salinity stress on SOM decomposition in coastal salt marshes |
| title_full_unstemmed | Soil microbial communities regulate the threshold effect of salinity stress on SOM decomposition in coastal salt marshes |
| title_short | Soil microbial communities regulate the threshold effect of salinity stress on SOM decomposition in coastal salt marshes |
| title_sort | soil microbial communities regulate the threshold effect of salinity stress on som decomposition in coastal salt marshes |
| topic | Salt marshes Salinity stress Soil organic matter decomposition Temperature sensitivity Threshold effect Microbial community |
| url | http://www.sciencedirect.com/science/article/pii/S2667325823000766 |
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