Related Experiment Video
Updated: May 4, 2026
17:39
A Lipid Extraction and Analysis Method for Characterizing Soil Microbes in Experiments with Many Samples
Published on: July 16, 2017
22.4K
Altered precipitation regime affects the function and composition of soil microbial communities on multiple time
L H Zeglin1, P J Bottomley2, A Jumpponen3
1Department of Crop and Soil Sciences, Oregon State University, Corvallis, Oregon 97331, USA. lydia.zeglin@oregonstate.edu
Ecology
|December 24, 2013
Summary
Climate change may alter rainfall patterns, impacting soil carbon cycling. Soils with longer dry periods showed higher microbial carbon use efficiency, suggesting potential for increased soil carbon storage.
Area of Science:
- Soil science
- Microbiology
- Climate change science
Background:
- Climate change models predict altered precipitation with longer dry spells.
- Shifts in microbial carbon (C) cycling due to changing rainfall can affect soil carbon storage.
- Microbial responses to wetting events may be influenced by prior drought stress.
Purpose of the Study:
- To quantify rainfall-driven microbial dynamics affecting soil C loss and retention.
- To assess microbial community composition under different precipitation regimes.
- To understand how long-term altered precipitation affects microbial C cycling.
Main Methods:
- A 14-year field experiment contrasted Ambient and Altered precipitation regimes.
- Soil samples were collected before, during, and after rainfall events in moist and dry periods.
- Measurements included microbial respiration, biomass, extracellular enzyme activities, and microbial community composition (PLFA).
Main Results:
- Rainfall events elicited similar microbial respiration in both treatments.
- Microbial biomass and carbon use efficiency (CUE) were higher in the Altered treatment and in drier soils.
- Enzyme activities increased post-rainfall in moist soils but not in dry soils; microbial community composition varied with water content, season, and treatment.
Conclusions:
- Drier soils may experience less soil organic matter loss and higher CUE, indicating greater soil carbon sequestration potential.
- History of extended dry periods may enhance microbial carbon sequestration.
- Microbial communities may shift towards stress-tolerant or more efficient taxa under altered precipitation regimes.
More Related Videos
Related Concept Videos
01:29Soil Microbial Ecology
83
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...
83
01:27Microbes and Climate Change
91
Microorganisms are pivotal agents in Earth's biogeochemical cycles, significantly influencing climate dynamics through their metabolic activities. These microbes modulate the levels of key greenhouse gases by both contributing to and helping mitigate climate change.Microbial Contributions to Greenhouse Gas EmissionsRising global temperatures accelerate microbial metabolism, which, in turn, speeds up the decomposition of organic matter. This process releases carbon dioxide (CO₂) through...
91
01:22Microenvironments
54
Microorganisms inhabit highly localized spaces known as microenvironments, which are defined by distinct physical and chemical characteristics. These include oxygen concentration, pH, temperature, light availability, and nutrient levels. The conditions within a microenvironment can differ markedly from those in the surrounding area and significantly influence microbial growth, metabolism, and community structure.Microenvironments often display sharp physicochemical gradients over small spatial...
54
01:30Marine Microbial Ecology
66
Marine microbial ecosystems are shaped by distinct physicochemical limits, including high salinity, low nutrient availability, and fluctuating oxygen levels. These conditions favor smaller microbial cell sizes, which maximize their surface-to-volume ratio for efficient nutrient uptake.Microbial activity and community composition are closely linked to biogeochemical cycles, particularly in dynamic environments like estuaries, where halotolerant microbes thrive in response to variable salinity...
66
01:19Methods to Assess Microbial Communities
60
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...
60
02:23The Soil Ecosystem
17.3K
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:
17.3K