Abstract: In this study, the stormwater samples of 4 storm events occurred in April and May 2005 were collected from different representative sites including road, roof, and residential, commercial and industrial districts in Xiamen Island. All the samples were delivered to laboratory within 24 h, and their NO₃^--N, NH₄⁺-N, dissolved total nitrogen (TN), and total phosphorus (TP) contents were analyzed. The water quality data showed there was a significant difference in the nitrogen and phosphorous concentrations of the stormwater runoff from different sites,with the mean value of TN, NO₃^--N, NH₄⁺-N and TP ranged as 1.96-6.77, 0.62-4.89, 0.35-1.18 and 0.04-0.66 mg·L^-1, respectively. In general, the nitrogen and phosphorus concentrations decreased gradually in the process of precipitation due to water dilution, but the nitrogen concentration fluctuated more intensively than phosphorus. Many factors such as precipitation intensity, land cover and vehicle exhaust affected the patterns of nitrogen and phosphorus transportation. The urban stormwater runoff collected from road and commercial and industrial districts contributed a higher nutrient loading, and thus, the management of urban stormwater runoff should be focused on these sites.

Key words: Environmental factors, Recrudescence of gonad, Ovulation, Spawning