Paper Information

Journal:   JOURNAL OF AGRICULTURAL SCIENCE (UNIVERSITY OF TABRIZ)   2007 , Volume 17 , Number 2; Page(s) 15 To 26.
 
Paper:  THE EFFECTS OF LAND USE MANAGEMENT ON SIZE AND DIVERSITY OF SOIL MICROBIAL COMMUNITIES
 
Author(s):  ASGHARIPOUR M.R.*, RIAHI NIA SH., KOUCHAKI ALI REZA
 
* ISLAMIC AZAD UNIVERSITY OF SHIRVAN, SHIRVAN, IRAN
 
Abstract: 

An understanding of the main factors influencing microbial diversity in soils is necessary to predict the effects of current land use trends on terrestrial diversity. In this study the effects of land use (high and low input systems) and pasture on microbial biomass and diversity was investigated. Respiration responses to specific substrate can be used to measuring of soil microbial diversity. We measured catabolic evenness and richness of microorganisms as measures of soil microbial diversity. Richness is the number of substrate used by the heterotrophic community, whereas heterotrophic evenness is the variability in substrate use, among the substrate tested. In comparison with agricultural systems, native pasture resulted in an increase in organic matter and microbial biomass. Within three land use types, in the high input system basal respiration was higher than under the other two systems, suggesting the presence of a small but highly metabolically active micro floral community. Analysis of catabolic response profiles demonstrated that there were large differences in the catabolic capability of the soil microbial communities under different land use type. Values for Shanon's and Simpson's diversity indices indicated that greatest catabolic existed under native grassland and least diversity under high input systems. It was attributed to a broad range of organic pool in the pasture. It was concluded that land use has substantial effects on the size, activity and diversity of the soil microbial community and these changes could be broadly related to the changes in soil organic matter content. Although the consequences of losses of microbial diversity are unknown, but diversity may results in greater resilient to stresses or disturbances.

 
Keyword(s): LAND USE, MICROBIAL BIOMASS, MICROBIAL DIVERSITY
 
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