The characteristics of NH<sub>4</sub><sup>+</sup>-N adsorption on intertidal sediments of the Changjiang Estuary in China

LIU Min; HOU Li-jun; XU Shi-yuan; JIANG Hai-yan; OU Dong-ni; YU Jie; WANG Qing

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Article Navigation > Haiyang Xuebao > 2005 > 27(5): 60-66

LIU Min, HOU Li-jun, XU Shi-yuan, JIANG Hai-yan, OU Dong-ni, YU Jie, WANG Qing. The characteristics of NH4+-N adsorption on intertidal sediments of the Changjiang Estuary in China[J]. Haiyang Xuebao, 2005, 27(5): 60-66.

Citation:

LIU Min, HOU Li-jun, XU Shi-yuan, JIANG Hai-yan, OU Dong-ni, YU Jie, WANG Qing. The characteristics of NH₄⁺-N adsorption on intertidal sediments of the Changjiang Estuary in China[J]. Haiyang Xuebao, 2005, 27(5): 60-66.

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The characteristics of NH₄⁺-N adsorption on intertidal sediments of the Changjiang Estuary in China

1.
Key Laboratory of Geo-information Science of the Ministry of Education, Department of Geography, East China Normal University, Shanghai 200062, China
2.
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China

Received Date: 2004-09-17
Rev Recd Date: 2005-06-27

Abstract

Abstract

Adsorption of sediments on NH₄⁺-N is one of the key biogeochemical processes,which plays an important role in the cycle of nitrogen in an estuary and tidalflats.NH₄⁺-N adsorbed by intertidal surface sediments was studied with simulation experiment from the Changjiang Estuary.It is indicated that the adsorption of sediments on NH₄⁺-N shows linear Changes in the possible range of NH₄⁺-N in overlying waters and porewaters from the intertidal flat of the Changjiang Estuary.The adsorption coefficients of NH₄⁺-N vary from 3.81 to 9.00,and are closely related to sedimentary organic carbon,showing that or ganic matter may control NH₄⁺-N adsorption behavior.Compared with the in situ measured data,it is concluded that NH₄⁺-N adsorption is under the non-thermodynamic balance status under natural conditions in the Changjiang Estuary.In addition,it is also showed that salinity has an important effect on NH₄⁺-N adsorption,and that the little change of salinity has a pronounced influence on NH₄⁺-N adsorption in sediments within the range of lower salinity.
- ammonium,
- adsorption,
- sediments,
- intertidal flat,
- Changjiang Estuary

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References(14)

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