期刊
MARINE POLLUTION BULLETIN
卷 64, 期 3, 页码 574-586出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2011.12.016
关键词
Ammonium; Phytoplankton; Wastewater; San Francisco Estuary; Eutrophication; Nitrification
资金
- Federal and California State Water Contractors
- San Luis and Delta-Mendota Water Authority
Primary production in the Northern San Francisco Estuary (SFE) has been declining despite heavy loading of anthropogenic nutrients. The inorganic nitrogen (N) loading comes primarily from municipal wastewater treatment plant (WTP) discharge as ammonium (NH4). This study investigated the consequences for river and estuarine phytoplankton of the daily discharge of 15 metric tons NH4-N into the Sacramento River that feeds the SFE. Consistent patterns of nutrients and phytoplankton responses were observed during two 150-km transects made in spring 2009. Phytoplankton N productivity shifted from NO3 use upstream of the WTP to productivity based entirely upon NH4 downstream. Phytoplankton NH4 uptake declined downstream of the WTP as NH4 concentrations increased, suggesting NH4 inhibition. The reduced total N uptake downstream of the WTP was accompanied by a 60% decline in primary production. These findings indicate that increased anthropogenic NH4 may decrease estuarine primary production and increase export of NH4 to the coastal ocean. (C) 2011 Elsevier Ltd. All rights reserved.
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