PIE LTER study of marsh vegetation percent cover and biomass at the end of the growing season at Greenwood Creek, Ipswich, MA effluent enrichment and Clubhead Creek, Rowley, MA reference sites

End of growing season vegetation percent cover and biomass data for effluent enrichment vs. reference  marsh sites. Nutrient enrichment comes from the Ipswich Wastewater Treatment Facility on Greenwood Creek in Ipswich.  The marsh around Clubhead Creek, Rowley, MA was used as a reference.