Impact of Elevated Atmospheric CO2 in Spartina maritima Rhizosphere Extracellular Enzymatic Activities

Atmospheric CO2 enrichment, which is caused to a large extent by anthropogenic activities, known interfere with sediment microbial communities via plant rhizospheres. The present work aimed evaluate this interaction in Spartina maritima ((Curtis) Fernald.) rhizosediments, aiming depict the impacts of atmospheric increase biogeochemical processes occurring rhizosphere pioneer and highly abundant Mediterranean halophyte. For purpose, mesocosms trials were conducted, exposing salt marsh cores S. its sediments 410 700 ppm while assessing rhizosediment extracellular enzymatic activities. An evident dehydrogenase activity was observed directly linked activity, indicating priming effect community under increased CO2. Phosphatase showed marked rhizosediments exposed elevated CO2, denoting higher requirement phosphate for maintaining biological rates. High sulphatase suggests possible S-limitation (microbial or plant) due probably sulphur needs protein synthesis, thus increasing need acquire more labile forms sulphur. With synthesize amino acids, decrease protease detected. Most carbon-related enzymes suffered an Overall, shift could be upon fertilization, mostly effects not changes quality carbon substrates, as shown stable isotope signatures. altered recycling organic C, N, P compounds may lead unbalance these cycles, shifting ecosystem function, inevitable services level.