Cadmium in insects after ash fertilization  

作　　者：Martin Lodenius Jussi Josefsson Kari Heliovaara Esa Tulisalo Matti Nummelin 

机构地区：[1]Department of Biological and Environmental Sciences [2]Department of Forest Ecology, University of Helsinki, Finland

出　　处：《Insect Science》2009年第1期93-98,共6页昆虫科学（英文版）

摘　　要：Ash fertilization of forests returns nutrients to forest ecosystems and has a positive effect on soil pH, but it also may elevate Cd concentrations of forest biota. Cadmium concentrations of some forest insects （Formica ants, carabids and Coleopteran larvae from decaying wood） were investigated in southern Finland, where two plots were fertilized with wood ash, while two other plots represented unfertilized control plots. In ants, mean Cd concentration was 3.6 ± 1.4 mg/kg, with nest workers having significantly higher concentrations than workers trapped in pitfall traps. Concentrations at fertilized and unfertilized plots were similar. In carabid beetles, the average Cd concentration of Carabus glabratus was 0.44 ±0.36 mg/kg, with no significant difference between control plots and fertilized plots. In another carabid beetle, Pterostichus niger, mean Cd concentration was higher at fertilized plots compared to control plots. We conclude that the variation of Cd concentrations in the insects studied is more efficiently controlled by species-specific differences than fertilization history of the forest floor.Ash fertilization of forests returns nutrients to forest ecosystems and has a positive effect on soil pH, but it also may elevate Cd concentrations of forest biota. Cadmium concentrations of some forest insects （Formica ants, carabids and Coleopteran larvae from decaying wood） were investigated in southern Finland, where two plots were fertilized with wood ash, while two other plots represented unfertilized control plots. In ants, mean Cd concentration was 3.6 ± 1.4 mg/kg, with nest workers having significantly higher concentrations than workers trapped in pitfall traps. Concentrations at fertilized and unfertilized plots were similar. In carabid beetles, the average Cd concentration of Carabus glabratus was 0.44 ±0.36 mg/kg, with no significant difference between control plots and fertilized plots. In another carabid beetle, Pterostichus niger, mean Cd concentration was higher at fertilized plots compared to control plots. We conclude that the variation of Cd concentrations in the insects studied is more efficiently controlled by species-specific differences than fertilization history of the forest floor.

关 键 词：BIOACCUMULATION CADMIUM CARABIDAE COLEOPTERA FERTILIZATION Formica wood ash 

分 类 号：Q969[生物学—昆虫学] X503.2[环境科学与工程—环境工程]