title: [Effects of both single and combined pollution of Cd and Nh4+ on Hydrilla verticillata and Myriophyllum spicatum].
abstract: Combined pollution is more ubiquitous than the single pollution in water and soil environment. Iodine method was used to study the effects of both single and combined pollution of Cd and NH4+ on Hydrilla verticillata and Myriophyllurn spicatum. Results came out that H. verticillata was distinctly stressed at 4.0 mg x L(-1) concentration of NHI4+, oxygen production of photosynthesis and oxygen depletion of respiration all declined, but for M. spicatum ,it was not be stressed. If treated with 0.2 mg x L(-1) Cd, H. verticillata and M. spicatum all were stressed, and H. verticillata was stressed more seriously. Combined pollution of Cd and NH4+ produced cooperative adverse effects on H. verticillata. But for M. spicatum, the stress was less severe comparatively. The main reason was that M. spicatum made of less crude cellulose. So it had less combined pathway with heavy mental than H. wvrticillata. It demonstrated that M. spicatum is suit for pioneer plant comparatively during the process of lake restoration.
authors.affiliation: Research Center of Lake Eco-Environment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China. xu.qiujin@yahoo.com.cn
authors.forename: Qiu-jin
authors.initials: QJ
authors.lastname: Xu
authors.forename: Xiang-can
authors.initials: XC
authors.lastname: Jin
authors.forename: Xing-min
authors.initials: XM
authors.lastname: Wang
authors.forename: Shu-qin
authors.initials: SQ
authors.lastname: Chen
authors.forename: Chang-zhou
authors.initials: CZ
authors.lastname: Yan
mesh_terms: D002104:Cadmium / Q000737:chemistry* / Q000633:toxicity; D031321:Hydrocharitaceae / Q000378:metabolism / Q000502:physiology*; D019684:Magnoliopsida / Q000378:metabolism / Q000502:physiology*; D010788:Photosynthesis / Q000187:drug effects / Q000502:physiology; D000644:Quaternary Ammonium Compounds / Q000737:chemistry* / Q000633:toxicity; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000633:toxicity
chemical_list: D000644:Quaternary Ammonium Compounds; D014874:Water Pollutants, Chemical; D002104:Cadmium