Shifts in Microbial Communities,Microbial Biomass and Organic Matter Mineralization for Three Mediterranean Soils Contaminated By Metals |
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Authors: | José L. Mateos Paloma Fernández Del Pino Francisco J. Gutiérrez Mañero María Ruiz Palomino Juan J. Colon José A. Lucas García |
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Affiliation: | 1. Depto. de Biología, Facultad de Ciencias Experimentales y Técnicas , Universidad San Pablo CEU , Urbanizatión Montepríncipe, Ctra. Boadilla Km 5.3, 28668-Boadilla del Monte, Madrid, Spain;2. Depto. de Ciencias Básicas, Facultad de Ciencias Experimentales y Técnicas , Universidad San Pablo CEU , Urbanizatión Montepríncipe, Ctra. Boadilla Km 5.3, 28668-Boadilla del Monte, Madrid, Spain |
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Abstract: | Microbial communities (phospholipid fatty acid pattern, bacterial growing strategies, eco-physiological index (EPI) and total bacteria counts, as a number of heterotrophic cuhurable bacteria), substrate-induced respiration (SIR), and nitrogen mineralization were studied in three Mediterranean soils at three different depth levels (A, B and C). Soils were experimentally treated with a final concentration of 1000 ppm of trace metals (Cu2+, Zn2+, Al3+, Fe2+, Pb2+, Ni2+, Mn2+, Cr3+ and Cd2+). Soils were stored in 571 plastic containers for one year, and watered with 1001 during this period. Leachate was recovered through a bottom tap. Samples of the three depths were studied. Soil microbial communities showed different effects to other studies presented in the literature, but carried out on non-Mediterranean soils. Dramatic differences were found between treated soils and untreated ones, but not between soils or horizons. the treated soil displayed a decrease in CFUs, SIR N-mineralization and EPI together with a dominance of r-growing strategists. the relative moles percent of several PLFAs, especially 15:0, 16: 1ω7, cy17: 0, br18:0 and 18: 1ω7 decreased because of the pollution of soils, whereas 10Me16, 18:2ω6, cy19:0, i16:0 and br17:0 showed higher values than in untreated soils. |
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