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How much zinc is accumulated in soil microbial biomass?
5th International Conference on Earth Science & Climate Change
Farshid Nourbakhsh and Parvin Zarei
Isfahan University of Technology, Iran
Posters & Accepted Abstracts: J Earth Sci Clim Change
Abstract
To our knowledge, there is no optimized and calibrated method to determine the amounts of Zn in soil microbial biomass (Znmic). We developed a chloroform fumigation-extraction (CFE) procedure for measuring Znmic. Ten samples of surface soils (0â��15 cm) were collected from calcareous soils of central Iran. To determine the efficiency of CFE for Znmic the soils were spiked with bacterial or fungal suspensions, separately. The known concentration of Zn in the inoculum served as a basis for Znmic conversion factor calculation. Spiked and un-spiked soil samples were fumigated and the amount of Zn released from the microbial suspensions was calculated by the difference in Zn concentration between spiked and un-spiked samples. Microbial biomass Zn conversion factor (KZn) was 0.33 based on the relative distribution of the soil bacterial and fungal biomass. The Znmic varied from 90.9 to 1363.6 �¼g kgâ��1 with a mean value of 599.9 �¼g kgâ��1. Compared to the amounts of DTPA-extractable Zn in the calcareous soils (680 to 2380 �¼g.kgâ��1), it is obvious that the Znmic is a significant Zn pool in the calcareous soils and cannot be neglected.Biography
Farshid Nourbakhsh has completed his PhD from Isfahan University of Technology, Isfahan Iran. His PhD thesis has been performed in Agriculture Canada, He is currently Professor of Soil Microbial Ecology at the Dept. of Soil Sciences, Isfahan University of Technology. He has published more than 50 papers in reputed journals. The details of his research interests and activities are available in google scholar.
Email: farshid@cc.iut.ac.ir
