Related Experiment Video
Updated: May 20, 2026
10:31
Isolation and Analysis of Microbial Communities in Soil, Rhizosphere, and Roots in Perennial Grass Experiments
Published on: July 24, 2018
Distinct soil bacterial communities revealed under a diversely managed agroecosystem
Raymon S Shange1, Ramble O Ankumah, Abasiofiok M Ibekwe
1Department of Agricultural and Environmental Science, Tuskegee University, Tuskegee, Alabama, United States of America. rshange2946@mytu.tuskegee.edu
Plos One
|July 31, 2012
Summary
Land use changes significantly alter soil bacterial communities, impacting soil function. Molecular techniques like 16S rRNA gene pyrosequencing reveal shifts in microbial taxa and soil properties across different land management systems.
Area of Science:
- Soil microbiology
- Environmental science
- Molecular ecology
Background:
- Land-use change and management practices aim to improve environmental conditions for production and remediation.
- The impact of these practices on soil microbial communities and functions is challenging to quantify.
- Molecular techniques, particularly 16S rRNA gene sequencing, offer new insights into soil microbial ecology.
Purpose of the Study:
- To investigate how different land-use systems (grazed pine forest, cultivated crop, grazed pasture) affect soil bacterial community structure and function.
- To correlate observed changes in bacterial communities with soil physiochemical properties.
- To understand the ecological roles of specific bacterial taxa under varying land management.
Main Methods:
- Collection of replicate soil samples from three distinct land-use systems on a uniform soil type.
- High-throughput 16S rRNA gene pyrosequencing to analyze bacterial community composition.
- Analysis of soil properties including soil organic carbon (SOC), total nitrogen (TN), texture, enzyme activities (PD, APA, ACP), and pH.
Main Results:
- Distinct differences in bacterial community structure and diversity indices were observed across the land-use systems.
- Significant shifts in specific bacterial taxa, including Actinobacteria, Acidobacteria, and Proteobacteria, were identified.
- Soil properties like SOC, phosphodiesterase (PD) activity, and pH varied significantly, correlating with changes in microbial community structure.
Conclusions:
- Land-use systems exert a strong influence on soil bacterial community composition and diversity.
- Specific bacterial groups, such as Actinobacteria, show adaptability to different soil conditions, challenging traditional copiotroph/oligotroph classifications.
- Integrated analysis of molecular data and soil physiochemical properties provides valuable insights into soil microbial ecology and the impact of land management.
Related Concept Videos
01:29Soil Microbial Ecology
Soil microbial ecology is defined by highly diverse, spatially structured communities that drive nutrient cycling, organic matter turnover, and overall ecosystem stability. Although a gram of soil can contain thousands of bacterial and archaeal taxa, the ecological processes they mediate are even more crucial for sustaining terrestrial life.Microhabitats and NichesSoil is a heterogeneous mixture of minerals, organic matter, water, and air. Microbes inhabit distinct microhabitats formed by...
01:28Introduction to Microbial Ecology
Microbial ecology examines the complex web of interactions and diversity among microorganisms within various ecosystems. This field seeks to understand how microbial populations adapt to and influence their environments and how these interactions shape broader ecological processes. Microbes are integral to ecosystem function, participating in nutrient cycling, energy flow, and the maintenance of environmental homeostasis.An ecosystem represents a dynamic interaction between living organisms...
02:23The Soil Ecosystem
Plants obtain inorganic minerals and water from the soil, which acts as a natural medium for land plants. The composition and quality of soil depend not only on the chemical constituents but also on the presence of living organisms. In general, soils contain three major components:
01:25Microbial Mats
Microbial communities forming biofilms and mats represent complex, spatially structured ecosystems where metabolic processes are stratified according to light, oxygen, and nutrient gradients. Biofilms are initial colonization stages, only a few millimeters thick, while mature microbial mats can reach centimeter-scale thickness and display intricate vertical organization. Their structural and functional heterogeneity allows microorganisms to occupy distinct ecological niches within a few...
01:18Deep Sea Microbial Ecology
The deep ocean and its underlying sediments represent vast, largely unexplored microbial habitats that extend far beyond the sunlit photic zone. The photic (euphotic) zone typically spans the upper ~100–200 meters of pelagic waters in the open ocean, but its depth varies geographically and seasonally, where sufficient light supports photosynthetic life. Below this lies the deep sea, spanning roughly 1000–6000 meters (bathypelagic to abyssal zones), with deeper hadal trenches extending beyond...
01:19Methods to Assess Microbial Communities
Microbial communities, comprising bacteria, archaea, and eukaryotic microorganisms, inhabit diverse ecosystems and play crucial roles in environmental and biological processes. Their diversity is defined by three main parameters: species richness (the number of distinct species), species abundance (the relative quantity of each species), and species evenness (how uniformly individual species are distributed in various locations). These factors together shape the structure and ecological balance...