Abstract
Heavy metal contamination influences soil and plant biological and biochemical properties (Anton et al. 1994; Brookes 1995; Mdthd and Kovc Szili-Kovc Abdorhim et al. 2004; Mt Simon and Bird 2005). Microbial biomass, respiration, and enzyme assays offer potential as indicators of biological functioning of soils. Soil characteristics such organic carbon, clay content and pH, soil moisture and -first for phosphatase activityavailability of phosphorus have a major influences on the extent of the effects of pollution by heavy metals on these biological and biochemical properties (Mathe and Kovacs 1980; Anton et al. 1994). There are increasing evidences of microbial biomass decrease due to metal contamination in soils (Brookes 1995; Szili-Kov&cs et al. 1998). Most soil biological investigations were based on laboratory soil metal enrichment but very few attempts were made to study real pollution situations (Takacs and VOros 2003). This latter is difficult to study because of the spatial
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