Data/hora: 07/06/2024 00:57:42

Provedor de dados: | 27
País: | Belgium
Título: | Uptake of dissolved inorganic nitrogen in turbid, tidal estuaries
Autores: | Middelburg, J.J.; Nieuwenhuize, J.
Data: | 2000
Ano: | 2000
Palavras-chave: | ANE; Ems Estuary ANE; France; Gironde Estuary ANE; France; Pays de Loire; Loire Estuary ANE; Netherlands; Rhine estuary ANE; Netherlands; Westerschelde ANE; Portugal; Douro Estuary.
Resumo: | Ammonium and nitrate uptake was measured in 6 European tidal estuaries (Ems, Rhine, Scheldt, Loire, Gironde and Douro) using &lt;sup&gt;15&lt;/sup&gt;N-tracer techniques. Uptake rates of ammonium and nitrate ranged from 0.005 to 1.56 µmol N l&lt;sup&gt;-1&lt;/sup&gt;h&lt;sup&gt;-1&lt;/sup&gt; and 0.00025 to 0.25 µmol N l&lt;sup&gt;-1&lt;/sup&gt; h&lt;sup&gt;-1&lt;/sup&gt;, respectively, and differed significantly between and within estuaries. Analysis of nitrogen uptake using the relative preferential index (RPI) indicated ammonium to be the preferred substrate. The turnover times of particulate nitrogen (0.7 to 31 d) and dissolved ammonium (0.1 to 27 d) were similar to or shorter than estuarine-water residence times, whereas turnover times of dissolved nitrate (19 to 2160 d) were longer than residence times. Assimilation of nitrate in the water column of estuaries consequently does not influence its distribution, and most nitrate entering or produced in estuaries flushes through unless significant denitrification and/or burial in the sediment occur. As ammonium and particulate nitrogen are efficiently recycled, most allochthonous organic matter is extensively microbially modified before export, burial, or consumption by higher trophic levels.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.vliz.be/imisdocs/publications/144317.pdf

Relação:

info:eu-repo/semantics/altIdentifier/wos/000085578000006

info:eu-repo/semantics/dataset/url/www.vliz.be/imis?dasid=128

info:eu-repo/semantics/dataset/url/www.vliz.be/imis?dasid=1811

Formato: | application/pdf
Fonte: | %3Ci%3EMar.+Ecol.+Prog.+Ser.+192%3C%2Fi%3E%3A+79-88.+%3Ca+href%3D%22https%3A%2F%2Fhdl.handle.net%2F10.3354%2Fmeps192079%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fhdl.handle.net%2F10.3354%2Fmeps192079%3C%2Fa%3E
Fonte: | info:eu-repo/semantics/openAccess