Anthropogenic discharges of nitrogen(N)and phosphorus(P)have caused widespread threats to coastal ecosystems.Bacterioplankton play crucial roles in N/P cycling,but little is known about how bacterioplankton community responds to N-P co-enrichment in coastal waters.We used 16S amplicon pyrosequencing to investigate the spatial variation in bacterioplankton communities of 5 sites across a N-P gradient in coastal East China Sea.