title: [Distribution characteristics of organic matter and total nitrogen in sediments of lake Wuliangsuhai].
abstract: Lake Wuliangsuhai is one of the representative inland freshwater lakes in grassland areas of China, and its shrinking and eutrophication is becoming more serious. The study on the ecological and environmental effects of the shrinking and eutrophication revealed that the total nitrogen (TN) content in the surface sediment of the lake had an obvious differentiation both in longitudinal and in latitudinal direction, and had a significant correlation with organic matter content. The mean C/N ratio of the sediment ranged from 12.07 to 19.95, which meant that the organic matter was mainly come from the hydrophytes of the lake, and the eutrophication of the lake was mostly caused by its internal load. Both TN and organic matter had a clear grain-size effect in different fractions of grain sizes of surface sediment, and their contents in IV (< 63 microm) were as 3.1 - 7.6 and 2.5 - 8.0 times as those in I (>250 microm), respectively.
authors.affiliation: Department of Ecology and Environment Science, Inner Mongolia University, Huhhot 010021, China. shm@nmg.gov.cn
authors.forename: Huimin
authors.initials: H
authors.lastname: Sun
authors.forename: Jiang
authors.initials: J
authors.lastname: He
authors.forename: Changwei
authors.initials: C
authors.lastname: Lu
authors.forename: Xingdong
authors.initials: X
authors.lastname: Gao
authors.forename: Qingyun
authors.initials: Q
authors.lastname: Fan
authors.forename: Hongxi
authors.initials: H
authors.lastname: Xue
authors.forename: Huijuan
authors.initials: H
authors.lastname: Tian
mesh_terms: D002244:Carbon / Q000032:analysis*; D002681:China; D005068:Eutrophication; D005618:Fresh Water / Q000032:analysis*; D019015:Geologic Sediments / Q000032:analysis*; D009584:Nitrogen / Q000032:analysis*; D009930:Organic Chemicals / Q000032:analysis*
chemical_list: D009930:Organic Chemicals; D002244:Carbon; D009584:Nitrogen