The Study of Bacterial Community in Different Land Use and Flood Spreading

Document Type : Research Paper

Author

Assistant Professor, Agriculture and Natural Resources Research Center of Fars Province

Abstract

This study was conducted on a Typic Haplocalcids, coarse-loamy over loamy skeletal carbonatic, (hyper) thermic soil (alluvium-derived) at the Gareh Bygone Plain Experiment Station, 200 km to the south-east of Shiraz, Iran. Four composite samples of surface soil (0-20 cm) were collected from: (1) a control site without floodwater spreading. (2) The first two sedimentation basins (SBs) of the Bisheh Zard1 artificial recharge of groundwater (ARG) system, where Eucalyptus camaldulensis had been planted in Jan.-Feb. 1983(EUCA). (3) SB2 and SB3 of the Rahim Abad, which formed the third treatment and were under native pasture and irrigated with floodwater. (4) Farm fields located at south-west of Bisheh Zard formed the fourth treatment(AFAR). These samples were used for enumeration of total bacteria and nitrifying bacteria by the Most Probable Number (MPN) method. It was observed that, in comparison with the control, the total population of the soil bacteria increased by about 34 and 24 fold, respectively, at the sites with Eucalyptus camaldulensis and native pasture along with floodwater spreadingl. Two former sites had about 6 and 4 fold more microorganisms as compared with the farm fields. An increase in moisture and substrate supply for the biotic community at these sites, are the two major determinants. Amounts of organic matter in the site planted with E. camaldulensis, had increased by about 2-fold in comparison with control and farm fields (1.40% versus 0.63% and 0.73%, respectively). The number of ammonium oxidizers in EUCA and AFAR sites increased significantly. The number of both ammonium and nitrite oxidizers (nitrifiers) was more in the site with E. camaldulensis than the other sites. It may be concluded that cultivation of E. camaldulensis stimulates the growth and activity of nitrifier bacteria and subsequently, nitrification.

Keywords

References

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Iranian Journal of Soil Research
Volume 21, Issue 1
May 2007
Pages 121-128

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