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Impact of macrofaunal activities on the DIN exchange at the sediment-water interface along the tidal flat of Yangtze River estuary
Ist Teil von
Huanjing kexue, 2005-11, Vol.26 (6), p.43
Ort / Verlag
China
Erscheinungsjahr
2005
Link zum Volltext
Quelle
MEDLINE
Beschreibungen/Notizen
The macrofaunal activities exert intensive and extensive influences on the accumulation, transportation, exchange and geochemistry processes of pollutants and redox sensitive elements around the sediment-water interface. Based on the simulated and contrastive analysis method, effects of bivalve Corbicula fluminea activities on dissolved inorganic nitrogen (DIN) exchange between sediment-water interface in different experimental conditions and nitrogen biogeochemical cycling along the tidal flats of Yangtze River estuary are discussed. In short time experiment, Corbicula fluminea burrowing activities increased NH4+ release from sediments, and NO3- efflux to overlying water was much more in Corbicula fluminea inhabiting core. During long time incubation, NH4- and N released in turn from the sediments, bioturation can facilitate NH4- release from the sediments at the beginning of incubation, and stronger nmistrification derived from bioturbation witin the sediments enlarge Nsedim concentration. Disturbance and b