Article

The release behavior of inorganic nitrogen and phosphorus in sediment during disturbance

North China Sea Branch of the State Oceanic Administration Qingdao 266033 China
Chinese Journal of Oceanology and Limnology (impact factor: 0.5). 04/2008; 26(2):197-202. DOI:10.1007/s00343-008-0197-y pp.197-202

ABSTRACT Sediments and surface water were sampled in a tide flat in the Huiquan Bay, Qingdao, China in January 2004 to simulate the
exchange of NH4-N/NO3-N/PO43− between sediments and surface water. A working system was designed with which samples were shaken at 60, 120 and 150 revolutions
per minute (r/min). Experiment results show that NH4-N concentration in water at shaking rate of 60 r/min decreased gradually, while at 120 r/min increased gradually. In resuspension,
fine-grained sediments contributed most NH4-N to the seawater, followed by medium-grained and coarse-grained sediments. The NO3-N concentration in water had a negative relation with the shaking rate; the medium-grained sediments contributed more NO3-N to seawater than the coarse-and fine-grained sediments. The PO43− concentration is positively related with the shaking rate, the fine-grained sediments were the main N and P contributor to
the seawater, followed by medium-and coarse-grained sediments.

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Keywords

150 revolutions
 
coarse-and fine-grained sediments
 
coarse-grained sediments
 
Experiment results
 
fine-grained sediments
 
main N
 
medium-and coarse-grained sediments
 
medium-grained sediments
 
negative relation
 
NH4-N concentration
 
NO3-N
 
NO3-N concentration
 
P contributor
 
PO43− concentration
 
Qingdao
 
sediments
 
shaking rate
 
surface water
 
tide flat
 
working system
 

Pibo Wang