title: Ecological risk assessments and context-dependence analysis of heavy metal contamination in the sediments of mangrove swamp in Leizhou Peninsula, China.
abstract: Sediments in eight types of mangroves were sampled in the Leizhou Peninsula. Heavy metals were analyzed to investigate the effects on metal distribution of mangrove communities, to evaluate contamination levels, identify sources and relationships between the two. Results showed that mangrove communities have effects on most heavy metal distributions in sediments, especially in the sediment with shrub communities of Aegiceras corniculatum where the contents of many metals are highest. As, Cr and Ni were identified as metal pollutants of primary concern, while Cd was of no concern. Zn, Pb, As mainly originated from anthropogenic source while the other metals are geogenic. Heavy metal distributions were affected by the independent and joint effects of landscape and sediment context; landscape context explains more variations in heavy metals than does sediment physicochemical variables. Total sulfur, total phosphorus and total potassium in sediment, and the existence of paddy field and forest land within 2000m around the sampling sites are significant variables also.
authors.affiliation: State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Graduate University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. Electronic address: mkm@rcees.ac.cn.
authors.forename: Keming
authors.initials: K
authors.lastname: Ma
authors.affiliation: State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
authors.forename: Laiye
authors.initials: L
authors.lastname: Qu
mesh_terms: D002681:China; D004463:Ecology / Q000379:methods; D004784:Environmental Monitoring / Q000379:methods; D019015:Geologic Sediments / Q000032:analysis* / Q000737:chemistry; D019216:Metals, Heavy / Q000032:analysis*; D015999:Multivariate Analysis; D010758:Phosphorus / Q000032:analysis; D011188:Potassium / Q000032:analysis; D018570:Risk Assessment / Q000379:methods*; D013455:Sulfur / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000032:analysis*; D053833:Wetlands
chemical_list: D019216:Metals, Heavy; D014874:Water Pollutants, Chemical; D010758:Phosphorus; D013455:Sulfur; D011188:Potassium
keywords: Ecological risk; Heavy metals; Mangrove swamp; Multivariate analysis; Vegetation community