Saltwater and phosphorus drive unique soil biogeochemical processes in freshwater and brackish wetland mesocosms
نویسندگان
چکیده
Coastal ecosystems are exposed to saltwater intrusion but differential effects on biogeochemical cycling uncertain. We tested how elevated salinity and phosphorus (P) individually interactively affect microbial activities in freshwater brackish wetland soils. In experimental mesocosms, we added crossed gradients of concentrations soluble reactive P (SRP) (0, 20, 40, 60, 80 μg/L) 4, 7, 12, 16 ppt) peat soils (10, 14, 17, 22, 26 for 35 d. quantified changes water chemistry [dissolved organic carbon (DOC), ammonium ( NH 4 + ), nitrate nitrite (N N), SRP concentrations], soil extracellular enzyme activities, respiration rates, biomass C, (%C, %N, %P, C:N, C:P, N:P). DOC, , increased decreased mesocosms with salinity. DOC similarly P, N both mesocosms. soils, column uptake occurred only the absence when was above 40 µg/L. Freshwater EEAs, C were consistently higher compared those from phosphatase rates Elevated arylsulfatase %C, %P C:P N:P %C C:N released more nutrients than salinity, less responsive expected. became nutrient-depleted whereas unaffected by uptake. Microbial inhibited slightly P.
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Introduction Conclusions References
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ژورنال
عنوان ژورنال: Ecosphere
سال: 2021
ISSN: ['2150-8925']
DOI: https://doi.org/10.1002/ecs2.3704