首页 | 本学科首页   官方微博 | 高级检索  
   检索      


Effect of nutrient loading on biogeochemical and microbial processes in a New England salt marsh
Authors:Jane M Caffrey  Michael C Murrell  Cathleen Wigand  Richard McKinney
Institution:(1) Center for Environmental Diagnostics and Bioremediation, University of West Florida, 11000 University Parkway, Pensacola, FL 32514, USA;(2) Office of Research and Development, National Health and Environmental Effects Research Laboratory, Gulf Ecology Division, US EPA, 1 Sabine Island Dr., Gulf Breeze, FL 32561, USA;(3) Office of Research and Development, National Health and Environmental Effects Research Laboratory, Atlantic Ecology Division, US EPA, 27 Tarzwell Dr, Narragansett, RI 02882, USA
Abstract:Coastal marshes represent an important transitional zone between uplands and estuaries. One important function of marshes is to assimilate nutrient inputs from uplands, thus providing a buffer for anthropogenic nutrient loads. We examined the effects of nitrogen (N) and phosphorus (P) fertilization on biogeochemical and microbial processes during the summer growing season in a Spartina patens (Aiton (Muhl.)) marsh in the Narragansett Bay National Estuarine Research Reserve on Prudence Island (RI). Quadruplicate 1 m2 plots were fertilized with N and P additions, N-only, P-only, or no additions. N-only addition significantly stimulated bacterial production and increased pore water NH4+ and NO3 concentrations. Denitrification rates ranged from 0 to 8 mmol m−2 day−1. Fertilization had no apparent effect on soil oxygen consumption or denitrification measured in the summer in intact cores due to high core-to-core variation. P fertilization led to increased pore water dissolved inorganic phosphorus (DIP) concentrations and increased DIP release from soils. In contrast the control and N-only treatments had significant DIP uptake across the soil-water interface. The results suggest that in the summer fertilization has no apparent effect on denitrification rates, stimulates bacterial productivity, enhances pore water nutrient concentrations and alters some nutrient fluxes across the marsh surface.
Keywords:Bacterial production  Fertilization  Denitrification  Nitrogen  Phosphorus  Salt marsh
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号