title: [Effects of forest and swamp on hydrochemical characteristics of streams].
abstract: With the upper reaches of Gongbiela River in the northeast part of Xiaoxing' an Mountains as test area, this paper studied the hydrochemical characteristics of the streams in forest and swamp during the period of June - September 2004. The results indicated that the hydrochemistry of forest and swamp streams belonged to calcium-bicarbonate type I (C1(Ca)). The pH value, mineralization rate, total hardness, and HCO3(-), SO4(2-), Ca(2+), Mg(2+) and Fe concentrations of forest streams were lower than those of swamp streams, while the concentrations of total N, total P, Cl-, K+, and Na+ were in adverse. In both of the streams, the contents of heavy metal elements such as Fe, Mn, Cu, Zn, Cd, Hg and Pb were lower than the class I in Environmental Quality Standards for Surface Water (EQSSW) of China. The concentrations of total N and P in forest streams were (0.27 +/- 0.04) mg x L(-1) and (0.040 +/- 0.005) mg x L(-1), respectively, being significantly higher than those ((0.21 +/- 0.02) mg x L(-1) and (0.025 +/- 0.004) mg x L(-1)) in swamp streams. Swamp wetland had a stronger ability in depositing and adsorbing N and P, with more NH4(+) -N adsorbed than NO3(-) -N, and also had a stronger ability on the reduction and release of Fe, with the Fe content ((0.26 +/- 0.05) mg x L(-1)) in its streams obviously higher than that in forest streams.
authors.affiliation: School of Forestry, Northeast Forestry University, Harbin 150040, China. man-nefu@163.com
authors.forename: Xiuling
authors.initials: X
authors.lastname: Man
authors.forename: Jinfeng
authors.initials: J
authors.lastname: Fan
authors.forename: Xiaojing
authors.initials: X
authors.lastname: Tan
authors.forename: Tijiu
authors.initials: T
authors.lastname: Cai
mesh_terms: D017753:Ecosystem; D004777:Environment; D004784:Environmental Monitoring; D005618:Fresh Water / Q000032:analysis*; D007287:Inorganic Chemicals / Q000032:analysis*; D019216:Metals, Heavy / Q000032:analysis*; D045483:Rivers; D014197:Trees / Q000378:metabolism*
chemical_list: D007287:Inorganic Chemicals; D019216:Metals, Heavy