title: Effects of environmental factors on nutrients release at sediment-water interface and assessment of trophic status for a typical shallow lake, northwest China.
abstract: Surface sediment and water samples were collected from Daihai Lake to study the biogeochemical characteristics of nitrogen and phosphorus, to estimate the loads of these nutrients, and to assess their effects on water quality. The contents and spatial distributions of total phosphorus (TP), total nitrogen (TN), and different nitrogen forms in sediments were analyzed. The results showed that concentrations of TN and TP in surface sediments ranged from 0.27 to 1.78 g/kg and from 558.31 to 891.29 mg/kg, respectively. Ratios of C:N ranged between 8.2 and 12.1, which indicated that nitrogen accumulated came mainly from terrestrial source. Ratios of N:P in all sampling sites were below 10, which indicated that N was the limiting nutrient for algal growth in this lake. Effects of environment factors on the release of nitrogen and phosphorus in lake sediments were also determined; high pH values could encourage the release of nitrogen and phosphorus. Modified Carlson's trophic state index (TSI(M)) and comprehensive trophic state index (TSI(C)) were applied to ascertain the trophic classification of the studied lake, and the values of TSI(M) and TSI(C) ranged from 53.72 to 70.61 and from 47.73 to 53.67, respectively, which indicated that the Daihai Lake was in the stage of hypereutropher.
authors.affiliation: College of Life Science of Inner Mongolia University, University West Road No. 235, Saihan District, Hohhot, Inner Mongolia 010021, China ; College of Environment and Resource, Inner Mongolia University, University West Road No. 235, Saihan District, Hohhot, Inner Mongolia 010021, China.
authors.forename: Dekun
authors.initials: D
authors.lastname: Hou
authors.forename: Jiang
authors.initials: J
authors.lastname: He
authors.forename: Changwei
authors.initials: C
authors.lastname: Lü
authors.forename: Ying
authors.initials: Y
authors.lastname: Sun
authors.forename: Fujin
authors.initials: F
authors.lastname: Zhang
authors.forename: Khureldavaa
authors.initials: K
authors.lastname: Otgonbayar
mesh_terms: D002244:Carbon / Q000032:analysis; D002681:China; D004777:Environment; D019015:Geologic Sediments / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D060106:Lakes / Q000737:chemistry; D009584:Nitrogen / Q000032:analysis; D010758:Phosphorus / Q000032:analysis; D014867:Water / Q000737:chemistry; D060753:Water Quality
chemical_list: D014867:Water; D010758:Phosphorus; D002244:Carbon; D009584:Nitrogen
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