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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.

Primary Production

Primary Production

The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.

What are Biogeochemical Cycles?

What are Biogeochemical Cycles?

The most common elements in organic molecules, carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus, are only available in the ecosystem in limited amounts. Therefore, these nutrients must be recycled through both biotic and abiotic components of the ecosystem, in processes generally called biogeochemical cycles.

Bioremediation

Bioremediation

Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.

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Related Experiment Video

Updated: May 20, 2025

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

Three-stage phosphorus release model during macrophyte decomposition in macrophyte-dominated eutrophic lake.

Yaqin Wang¹, Manman Liu¹, Huatang Ren¹

¹College of Life and Environmental Science, Minzu University of China, Beijing 100081, China.

The Science of the Total Environment

|May 9, 2025

Summary

This summary is machine-generated.

A new three-stage model accurately predicts phosphorus release from macrophyte decomposition in eutrophic lakes, outperforming traditional methods. This framework is crucial for understanding lake nutrient cycling and managing aquatic ecosystems.

Keywords:

Decomposition Eutrophication Macrophyte Nutrient Phosphorus Sediment

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Last Updated: May 20, 2025

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

Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment

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Published on: July 22, 2019

Use of Chironomidae Diptera Surface-Floating Pupal Exuviae as a Rapid Bioassessment Protocol for Water Bodies

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Published on: July 24, 2015

Area of Science:

Environmental Science
Limnology
Ecology

Background:

Phosphorus (P) release from macrophyte decomposition is vital for lake phosphorus cycling, especially in macrophyte-dominated eutrophic (MDE) lakes.
Accurate modeling of phosphorus release dynamics is essential for comprehensive nutrient cycling models in MDE lakes.

Purpose of the Study:

To challenge the conventional one-stage phosphorus release model.
To propose and validate a novel three-stage phosphorus release framework for macrophyte decomposition.
To investigate the influence of environmental factors and biological activity on phosphorus release stages.

Main Methods:

Conducted in-situ experiments using senescent macrophyte detritus in Wuliangsu Lake, China.
Utilized 252 litterbags to control variables: detritus type, fragment size, vertical position, and mesh size.
Analyzed phosphorus release rates and macroinvertebrate abundance to establish quantitative relationships.

Main Results:

The proposed three-stage model demonstrated superior performance (R² > 0.80) compared to the one-stage model (R² < 0.67).
Identified three distinct phosphorus release stages: rapid leaching (0-4 days), slow microbial decay (4-200 days), and resurgent release ( > 200 days).
Established a quantitative relationship between macroinvertebrate abundance and the third-stage release rate (k₃ = k₃₋₁eᵇˣᴺ, R² = 0.85).

Conclusions:

The three-stage model provides a more accurate representation of phosphorus release dynamics during macrophyte decomposition.
Macroinvertebrate colonization significantly contributes to the resurgent phosphorus release in the later decomposition stages.
This research enhances our understanding of nutrient cycling in MDE lakes and informs ecological management strategies.