Analysis on Causes for Yearly Increment of Content of the Inorganic Phosphorus in the Nearshore Sea Area of yantai

摘要

Detailed analyses of the monitored data provided by the Yantai Ocean Administration Office between 1989 and 1996 show that, the fluctuation regularities of content of the inorganic phosphorus are as follows: the content of inorganic phosphorus fluctuated near the class-1 standard line basically from 1989 to 1993, trened to increase rapidly from 1993, and increased continuously, causing water quality to be deteriorated from the class-2 to calss-3 standard by 1996. Causes for increment of the content of inorganic phosphorus are also analyzed. The results show that, the flux of phosphorus entering Yantial nearshore sea area increases at an annual rate of 16.5 percent, in which the increment rates of the phosphorus contained in washing powder and in phosphate fertilizer are 12.9 and 17.5 percent respectively. Both of them kept a positive interrelationship with their fluxes into the sea. In addition the migraine and regeneration mechanism of the phosphorus within the nearshore area also lead to the inorganic phosphorus accumulating in the nearshore area of Yantiai.