title: Nitrogen contamination in the Yangtze river system, China.
abstract: The data at 570 monitoring stations during 1990 were studied. The results indicate as follows: (i) the contents of nitrogen in the Yangtze mainstream has a raising trend from the upper reaches to the lower reaches; (ii) total nitrogen content at a lot of stations during the middle 1980s is 5-10 times more than that during the 1960s; (iii) seasonal variances of nitrogen content vary with watersheds; and (iv) the difference of nitrogen contamination level is related to the regional population and economic development.
authors.affiliation: Department of Urban and Environmental Science, Peking University, Beijing, China.
authors.forename: C
authors.initials: C
authors.lastname: Jingsheng
authors.forename: G
authors.initials: G
authors.lastname: Xuemin
authors.forename: H
authors.initials: H
authors.lastname: Dawei
authors.forename: X
authors.initials: X
authors.lastname: Xinghui
mesh_terms: D000641:Ammonia / Q000032:analysis; D000704:Analysis of Variance; D002681:China; D004784:Environmental Monitoring; D005308:Fertilizers / Q000032:analysis; D015386:Hazardous Substances / Q000032:analysis; D006801:Humans; D009566:Nitrates / Q000032:analysis; D009573:Nitrites / Q000032:analysis; D009584:Nitrogen / Q000032:analysis*; D011156:Population Density; D012621:Seasons; D012959:Socioeconomic Factors; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D005308:Fertilizers; D015386:Hazardous Substances; D009566:Nitrates; D009573:Nitrites; D014874:Water Pollutants, Chemical; D000641:Ammonia; D009584:Nitrogen