[Forms and bioavailability of phosphorus in surface sediments from Sungo Bay].
Forms and bioavailability of phosphorus in the sediments of eight sampling sites from Sungo Bay were analyzed by means of sequential extraction method (SEDEX).


RESULTS
showed that: (1) The main form of total phosphorus (TP) in sediments was inorganic phosphorus (IP), which accounted for 73.33% and organic phosphorus (OP) was only the minor part. (2) Among different forms of inorganic phosphorus, calcium phosphorus (Ca-P) was the dominant forms, accounted for 45.22% of total phosphorus while organic phosphorus, adsorbed-phosphorus (Ads-P), iron-phosphorus (Fe-P) and detritus-phosphorus (Detr-P) was 26.67%, 9.92%, 4.74% and 13.46% respectively. (3) The correlation analysis among different phosphorus forms suggested that the concentrations and distribution of total phosphorus were mainly controlled by organic phosphorus (p < 0.05), while inorganic phosphorus was affected by calcium-phosphorus (p < 0.01). (4) Bioavailable phosphorus in sediments ranged from 358.05 microg/g to 448.39 microg/g and occupied 86.54% of the total phosphorus pool.
Jiang
Zeng-jie
ZJ
Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266003, China. jiangzj@ysfri.ac.cn
Fang
Jian-guang
JG
Zhang
Ji-hong
JH
Mao
Yu-ze
YZ
Wang
Wei
W
D002130:Calcium Phosphates / Q000032:analysis*; D002681:China; D019015:Geologic Sediments / Q000737:chemistry*; D007287:Inorganic Chemicals / Q000032:analysis / Q000737:chemistry; D009792:Oceans and Seas; D010710:Phosphates / Q000032:analysis / Q000737:chemistry*; D010758:Phosphorus / Q000032:analysis / Q000737:chemistry*; D012623:Seawater / Q000032:analysis
D002130:Calcium Phosphates; D007287:Inorganic Chemicals; D010710:Phosphates; D010758:Phosphorus; C020243:calcium phosphate