ARTÍCULO
TITULO

Benthic Nutrient Fluxes from Mangrove Sediments of an Anthropogenically Impacted Estuary in Southern China

David Kaiser    
Nicole Kowalski    
Michael E. Böttcher    
Bing Yan and Daniela Unger    

Resumen

Mangroves serve as either sinks or sources for inorganic and organic nutrients and can mitigate anthropogenic nutrient pollution, control the production in adjacent systems, and prevent eutrophication. To better understand the nutrient dynamics in a subtropical mangrove, we employed a three-way approach in the Nanliu River Estuary, southern China: Pore water profiles and sediment incubations revealed benthic early diagenesis as well as sediment?water exchange of dissolved nutrients and oxygen, while tidal sampling of estuarine and mangrove water identified source and sink functions of the entire mangrove forest. Fluxes of oxygen during incubations were always directed into the sediment, indicating heterotrophy of the system. There was a net uptake of dissolved inorganic nitrogen, mainly caused by nitrate influx, while ammonium and nitrite showed variable flux direction. Despite high pore water concentrations, phosphate and silica showed net uptake. Fluxes of dissolved organic carbon were generally low except for high efflux in the dark following a storm event. Due to the combination of small forest area and strong anthropogenic nutrient input, the net sink function for dissolved nitrogen and phosphorus provides no significant buffer against the eutrophication of coastal waters.

 Artículos similares

       
 
Simone Cappello, Francesco Smedile, Gabriella Caruso, Sabrina Patania, Alessia Lunetta and Maurizio Azzaro    
Within the Svalbard archipelago, Kongsfjorden is an important marine ecosystem that is recognised as one of the main representative Arctic glacial fjords. Prokaryotic organisms are key drivers of important ecological processes such as carbon fluxes, nutr... ver más

 
Stephanie Mangan, Andrew M. Lohrer, Simon F. Thrush, Joanne I. Ellis and Conrad A. Pilditch    
Biogeochemical cycling in the marine coastal zone regulates the availability of nitrogen and carbon within soft sediment habitats. However, these pathways are being fundamentally altered by anthropogenic increases in nutrient delivery. Few studies have i... ver más

 
Jean-Claude Dauvin, Jean-Philippe Pezy, Emmanuel Poizot, Sophie Lozach and Alain Trentesaux    
About 80% of the seabed of the English Channel (EC) is covered by coarse sediment, from coarse sand to pebbles. Quantitative data on the benthic macrofauna in these types of sediment remains are rare due to the difficulty of using grab corers in such har... ver más

 
Jane B. Weinstock, Lourdes Vargas and Rachel Collin    
Ocean deoxygenation, warming, and acidification resulting from global change and increasing nutrient inputs are major threats to marine ecosystems. Despite this, spatial and temporal patterns of oxygen availability and their impacts on marine life are un... ver más

 
Sung-Han Kim, Jae-Seong Lee, Kyung-Tae Kim, Hyung-Chul Kim, Won-Chan Lee, Dongmun Choi, Sang-Hwa Choi, Jae-Hoon Choi, Hyo-Jin Lee and Jae-Hyuk Shin    
Sediment oxygen demand (SOD) and benthic nutrient fluxes (BNFs) were measured using an in situ benthic chamber at a fish farm (FF), oyster farm (OF), and controls (FF-C and OF-C) to assess the impact of aquaculture activities on organic carbon (OC) and n... ver más