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The Phosphorus Cycle

The Phosphorus Cycle

Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.

Soil Microbial Ecology

Soil 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...

Microbes and Other Elemental Cycles

Microbes and Other Elemental Cycles

Microbial activity plays a pivotal role in the biogeochemical cycling of iron and manganese, especially at the redox gradients characteristic of stratified aquatic environments. These cycles are driven by microbial transformations between oxidized and reduced forms of the metals, allowing organisms to exploit them for metabolic energy and structural purposes.Iron Cycling Across Redox GradientsIn neutral, oxygen-rich surface waters, iron is predominantly found in its oxidized, insoluble ferric...

Marine Microbial Ecology

Marine Microbial Ecology

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...

Freshwater Microbial Ecology

Freshwater Microbial Ecology

Freshwater systems such as streams, rivers, and lakes exhibit distinct physical and biological characteristics that influence their microbial communities. These environments are broadly categorized into lotic systems—those with flowing waters like streams and most rivers—and lentic systems, which include still or slow-moving waters such as lakes, ponds, and marshes.In lentic systems, phytoplankton drive primary production, generating autochthonous organic carbon. In contrast, lotic...

Environmental Applications of Microorganisms

Environmental Applications of Microorganisms

Microorganisms play a pivotal role in maintaining ecosystem balance by recycling essential elements such as carbon, nitrogen, and phosphorus, as well as supporting processes like bioremediation, wastewater treatment, and biofuel production.Microbes in Elemental CyclesIn the carbon cycle, microorganisms decompose organic matter, releasing carbon dioxide via aerobic respiration. This carbon dioxide is subsequently used by photosynthetic organisms to synthesize organic compounds, closing the...

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Related Experiment Video

Updated: Mar 27, 2026

Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment

Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment

Published on: July 22, 2019

Microbial phosphorus cycling in terrestrial ecosystems.

Josep Peñuelas^1,2, Bangxiao Zheng^3,4,5, Akash Tariq^6,7,8,9

¹CSIC, Global Ecology Unit CREAF-CSIC-UAB, Bellaterra, Spain. josep.penuelas@creaf.cat.

Nature Reviews. Microbiology

|March 25, 2026

Summary

Microbes drive the soil phosphorus cycle through essential nutrient mobilization and plant uptake enhancement. Chronic phosphorus scarcity spurs microbial evolution, impacting ecosystem health and global phosphorus availability.

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Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment

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Extraction and Analysis of Microbial Phospholipid Fatty Acids in Soils

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Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading

Published on: March 6, 2014

Area of Science:

Soil Science
Microbiology
Biogeochemistry

Background:

Phosphorus is a vital macronutrient for terrestrial ecosystems, often limiting productivity.
The terrestrial phosphorus cycle is mainly controlled by soil biogeochemistry and microbial transformations.
Microbial roles in phosphorus cycling are crucial for soil health and ecosystem function.

Purpose of the Study:

To synthesize knowledge on the microbial phosphorus cycle.
To highlight microbial mechanisms for phosphorus mobilization and plant uptake.
To introduce the Microbial Phosphorus Adaptive Evolution Theory (MPAET).

Main Methods:

Review of current scientific literature.
Emphasis on microbial enzymes (phosphatases) and organic acids.
Discussion of advanced technologies like metagenomics and isotopic tracing.

Main Results:

Microorganisms employ diverse strategies, including phosphatases (PhoA, PhoD) and organic acids, to mobilize phosphorus.
Chronic phosphorus limitation drives microbial evolution (MPAET) towards enhanced scavenging and phosphorus management.
Environmental factors and land use significantly modulate microbial phosphorus cycling and ecosystem effects.

Conclusions:

Microbial phosphorus cycling is integral to soil health, productivity, and carbon sequestration.
Integrating microbial processes into ecosystem models is critical for sustainable phosphorus management.
Understanding microbial phosphorus dynamics is key to addressing global food security and environmental change challenges.