首页|Responses of nitrogen cycling and related microorganisms to brackish wetlands formed by evapotranspiration

Responses of nitrogen cycling and related microorganisms to brackish wetlands formed by evapotranspiration

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Elevated evapotranspiration due to warmer air temperature could raise salinity and nutrient levels of some inland wetlands,potentially impacting nitrogen cycling.To characterize the impact of high evapotranspiration on soil microbial nitrogen cycling in inland wetlands,we compared freshwater and brackish marsh(or non-marsh)wetlands in terms of sediment ammonia-oxidizing rate(AOR),denitrifying rate(DR),and related microbial communities in a typical inland basin,the Hulun Lake basin,in China.Results showed that marsh ecosystems(ME)exhibited 31％higher AOR and 65％higher DR than non-marsh ecosystems(NE).For NE,freshwater non-marsh wetland exhibited 12％higher AOR than brackish non-marsh wetland.This was probably due to the inhibitory effects of high NH4+and salinity levels on ammonia-oxidizing archaea in brackish non-marsh wetland.Conversely,DR in brackish non-marsh wetland was 23％higher than that in freshwater non-marsh wetland,with total organic carbon(TOC)significantly influencing this difference,suggesting that the higher DR in brackish non-marsh wetland was mainly due to its higher TOC level.For ME,due to the direct and indirect interference of salinity,brackish marsh wetland displayed 26％lower AOR and 19％lower DR than freshwater marsh wetland.Besides,brackish wetlands harbored distinct ammonia-oxidizing and denitrifying microbial communities compared to freshwater wetlands.The assembly of these communities was dominated by stochastic processes,while brackish wetlands exhibited more prominent deterministic processes than freshwater wetlands.Overall,high evapotranspiration altered activities and community characteristics of ammonia oxidizers and denitrifiers in inland brackish wetlands by enhancing salinity and nutrient levels,while emergent plants occurring in ME could mitigate the adverse effects of salt stress of inland brackish wetlands on nitrogen cycling.

ammonia-oxidizing archaeaammonia-oxidizing bacteriaaquatic plantsdenitrifying bacterianitrogen transformationinland wetlands

Jiaohui FANG、Tianshu Lü、Jian LIU、Shangbin HE、Xiufeng YANG、Huashan DOU、Honghai ZHANG

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School of Life Sciences,Qufu Normal University,Qufu 273100(China)

Environment Research Institute,Shandong University,Qingdao 266237(China)

Hulunbuir Academy of Inland Lakes in Northern Cold & Arid Areas,Hulunbuir 021000(China)

山东省自然科学基金山东省自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金Colleges and Universities Youth Innovation Science and Technology Teams Support Program of Shandong Province,China

ZR2022QC146ZR2021YQ22318722423207040532270444322003492021KJ015

2024

10.1016/j.pedsph.2023.07.007

土壤圈(英文版)
中国土壤学会,中科院南京土壤研究所和土壤与农业可持续发展国家重点实验室

土壤圈(英文版)

CSTPCD
影响因子：0.477
ISSN：1002-0160
年,卷(期)：2024.34(1)
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