摘要:Nutrient pollution, now the leading cause of water quality impairment in the United States, hashad significant impact on the nation's waterways. Excessive nutrient pollution has been linkedto habitat loss, fish kills, blooms of toxic algae, and hypoxia (oxygen depleted water). Thehypoxic 'dead zone' in the Gulf of Mexico is one of the most striking illustrations of what canhappen when too many nutrients from inland watersheds reach coastal areas. Despite the effortsof municipal building programs, industrial wastewater requirements and agricultural programsdesigned to reduce sediment loads in waterways, water quality and nutrient pollution continuesto be a problem.