| The physical and chemical characteristics, various phosphorus forms from 10 sites in Yellow River's sediments were analyzed, and their relations were discussed. The results showed that, the values of total phosphorus, organic matter and active Fe， Al are 97.86-129.33 mg·kg-1, 0.11%-1.96%, 2.02-7.40 mg·g-1, 0.29-0.90 mg·g-1, respectively. The main mineral compositions of the sediments are quartz and albite; the main clay minerals are montmorillonate, illite, chlorite and kaolinite. Inorganic-P is the main form of phosphorus speciation. Ca-P is 37.61-64.04 mg·kg-1 and is the main form of IP. The cation exchange capacity was linearly correlated with the sum of clay and silt (R2=0.76). Also, the organic matter was linearly correlated with inorganic sedimentary phosphorus (R2=0.66). Moreover, the linear relationship between the sum of NaOH-P and BD-P and the sum of active Fe and active Al content was observed within the ten sediments investigated (R2=0.80). |
