Marine Metapopulations     

Celeste Benham  Alison M. Cawood  Geoffrey S. Cook  Ange Darnell  Peter C. Davison  Miriam C. Goldstein  Ayana Elizabeth Johnson  Talina Konotchick  Elisa M. Maldonado  Alexis L. Pasulka  Jennifer C. Prairie  Serena M. Moseman  Vera Tai  Christina A. Tanner  Tali Vardi  Tara S. Whitty  & Lisa A. Levin 《Marine Ecology》2008,29(2):319-320

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Assessment of As and Cd contamination in topsoils of Northern Ghorveh (Western Iran): role of parent material, land use and soil properties     

Mohammad Tahsin Karimi Nezhad  Manijeh Ghahroudi Tali  Mohammad Hashemi Mahmoudi  Ebrahim Pazira 《Environmental Earth Sciences》2011,64(5):1203-1213

The aim of this study was to investigate the influences of land use, parent materials (rock types) and soil properties on total arsenic and cadmium concentrations in the agricultural soils. A total of 87 surface (0–20 cm) soil samples were collected from four types of land use: irrigated farming, rangeland, dry farming and orchard. The average concentrations of the analyzed elements in topsoil were 84.426 mg As/kg and 3.289 mg Cd/kg. In addition, the pH, organic matter (OM), cation exchange capacity (CEC), soil grain sizes and CaCO₃ were measured for each sample. The results indicated that land use had no significant effect on As and Cd concentrations. Our findings indicated that the Cd concentrations were influenced by bedrock composition, but for As there were no significant differences between various soil parent materials (bedrocks). Soil pollution was assessed on the basis of pollution index (PI), comprehensive pollution index (P _n ) and geoaccumulation index (I _geo). Calculated indices showed high-pollution levels for As and low- to moderate-pollution levels for Cd.  相似文献