TY - JOUR
T1 - Experimental research on the impact of Corbicula fluminea on DIN exchange at a tidal flat sediment-water interface
AU - Liu, Jie
AU - Chen, Zhenlou
AU - Xu, Shiyuan
AU - Zheng, Xiangmin
PY - 2007/10
Y1 - 2007/10
N2 - Based on a simulative experiment and a comparison analysis, the effect of bivalve Corbicula fluminea activity on sediment-water exchange of dissolved inorganic nitrogen (DIN) is studied. The areas included three intertidal flat sites of the Changjiang (Yangtze) River estuary in China. The interface exchange flux of ammonium, nitrate and nitrite in the short experiment (6 h) was -46.4-40, -74.8-929. 1 and 2.5-14.6 μmol/(m2·h), respectively. It was found that the burrowing activities of C. fluminea increased NH4+ and NO3- release from sediments to overlying water in the short-term experiment. During long-term incubation, NH4+ and NO3- released in turn from the sediments. At the beginning of incubation, bioturbation by C. fluminea could accelerate NH4+ release from sediments 2-17 times in different sites, resulting in stronger nitrification and increased NO3- concentrations in the overlying water. Sediment profile analysis post-incubation shows that organic matter mineralization and sediment-water NH4+ exchange had been stimulated by C. fluminea bioturbation and bioirrigation during the experiment. Therefore, C. fluminea activities such as excretion, burrowing, irrigation and turbation can effectively alter nitrogen dynamics and accelerate and stimulate nitrogen exchange and cycling at the sediment-water interface.
AB - Based on a simulative experiment and a comparison analysis, the effect of bivalve Corbicula fluminea activity on sediment-water exchange of dissolved inorganic nitrogen (DIN) is studied. The areas included three intertidal flat sites of the Changjiang (Yangtze) River estuary in China. The interface exchange flux of ammonium, nitrate and nitrite in the short experiment (6 h) was -46.4-40, -74.8-929. 1 and 2.5-14.6 μmol/(m2·h), respectively. It was found that the burrowing activities of C. fluminea increased NH4+ and NO3- release from sediments to overlying water in the short-term experiment. During long-term incubation, NH4+ and NO3- released in turn from the sediments. At the beginning of incubation, bioturbation by C. fluminea could accelerate NH4+ release from sediments 2-17 times in different sites, resulting in stronger nitrification and increased NO3- concentrations in the overlying water. Sediment profile analysis post-incubation shows that organic matter mineralization and sediment-water NH4+ exchange had been stimulated by C. fluminea bioturbation and bioirrigation during the experiment. Therefore, C. fluminea activities such as excretion, burrowing, irrigation and turbation can effectively alter nitrogen dynamics and accelerate and stimulate nitrogen exchange and cycling at the sediment-water interface.
KW - Changjiang (Yangtze) River estuary
KW - Corbicula fluminea
KW - DIN
KW - impact
KW - sediment-water interface
UR - https://www.scopus.com/pages/publications/70349587938
U2 - 10.1007/s00343-007-0434-9
DO - 10.1007/s00343-007-0434-9
M3 - 文章
AN - SCOPUS:70349587938
SN - 0254-4059
VL - 25
SP - 434
EP - 443
JO - Chinese Journal of Oceanology and Limnology
JF - Chinese Journal of Oceanology and Limnology
IS - 4
ER -