Abstract
The retention capacity of the flood zone of the River Adour (SWFrance) has been estimated. This zone consists of ca. 1 km2of riparian vegetative strips (rvs) and ca. 16 km2 offloodplain (Barthes). A novel method of sediment collection hasbeen used in both sectors to determine the quantities of sedimenttogether with concentrations of organic nitrogen and carbon. Thestudy indicates that the vegetative strips accumulate largequantities of sediment with total nitrogen and total carbonconcentrations of ca. 4 mg/g dry matter and ca. 30 mg/g drymatter respectively. These concentrations were found to vary asa function of topography and vegetation. The floodplain receivesless sediment but the observed concentrations of nitrogen andcarbon are more variable and found in the range of 1–9 mg/gdry matter and 10–82 mg/g dry matter respectively. Thehighest levels of C and N are generally found in wooded areas ofthe floodplain.
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