soil elevation, Spartina patens, marsh organ, mesocosms, plant productivity, Schoenoplectus americanus, Cyperaceae - drug effects, Soil Pollutants - pharmacology, Air Pollutants - pharmacology, Random Allocation, Poaceae - drug effects, Wetlands, Climate Change, Seawater - adverse effects, Nitrogen - pharmacology, Cyperaceae - growth & development, Seasons,...