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Related Concept Videos

The Phosphorus Cycle01:21

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.
Microbial Wastewater Treatment01:30

Microbial Wastewater Treatment

Microbial communities in aquatic ecosystems play a key role in the natural breakdown of contaminants introduced through domestic and industrial effluents. Acting as biological catalysts, these microbes change and mineralize a wide range of organic and inorganic pollutants under different redox conditions.In oxygen-rich surface waters, aerobic heterotrophs lead organic matter breakdown, using oxygen as the terminal electron acceptor to efficiently oxidize substrates to carbon dioxide and water.
Selected Data About Geographic Locations01:25

Selected Data About Geographic Locations

Geographic Information Systems (GIS) rely on two core types of data: spatial data and attribute data.Spatial DataSpatial data defines the physical location of features within a coordinate system, typically expressed in terms of latitude and longitude. It provides precise positioning for elements like roads, rivers, or buildings.Attribute DataAttribute data complements spatial data by adding descriptive information about these features. For example, a road's spatial data includes its start and...
Typical Model Studies01:30

Typical Model Studies

Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
Thematic Layering in GIS01:30

Thematic Layering in GIS

In the past, planning projects such as schools or public facilities required extensive manual effort to gather and compile data. Information such as property boundaries, soil characteristics, road networks, zoning regulations, and flood zones had to be sourced individually from courthouses, utility providers, and registry offices. Assembling these datasets into a coherent format often took several months, delaying project timelines.The introduction of Geographic Information Systems (GIS)...
Manipulation and Analysis01:21

Manipulation and Analysis

GIS manipulation and analysis functions are vital for decision-making and planning. These activities range from data retrieval tasks, such as selecting information based on specific criteria, to advanced analytical techniques that address complex spatial problems.One critical GIS analysis method is overlaying, which combines multiple data layers to examine impacts. For example, overlaying a river-dammed lake boundary with road networks can identify affected infrastructure. Another common...

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Related Experiment Video

Updated: Jul 18, 2026

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading
10:49

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

Published on: March 6, 2014

[Research on dissolved nitrogen and phosphorus loading model based on GIS].

Yan-tao Ma1, Jin-feng Xue, Tao Liang

  • 1Department of Environmental Engineering, College of Resource & Environmental Science, Wuhan University, Wuhan 430072, China.

Huan Jing Ke Xue= Huanjing Kexue
|November 23, 2006
PubMed
Summary

Artificial rainfall experiments reveal strong correlations between runoff and dissolved nitrogen (DN) and dissolved phosphorus (DP) transport rates. A new load model identifies irrigable land as a primary source of DN pollution.

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Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment
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Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment

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Last Updated: Jul 18, 2026

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

Published on: March 6, 2014

Visualization of Productivity Zones Based on Nitrogen Mass Balance Model in Narragansett Bay, Rhode Island
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Visualization of Productivity Zones Based on Nitrogen Mass Balance Model in Narragansett Bay, Rhode Island

Published on: July 14, 2023

Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment
06:42

Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment

Published on: July 22, 2019

Area of Science:

  • Environmental Science
  • Water Quality Management
  • Hydrology

Context:

  • Nonpoint source pollution is a significant threat to water bodies like Guanting Reservoir.
  • Understanding the origins of dissolved nitrogen (DN) and dissolved phosphorus (DP) is crucial for effective management.
  • Previous models may not fully capture the dynamic transport of these pollutants.

Purpose:

  • To investigate the origins and transport mechanisms of dissolved nitrogen (DN) and dissolved phosphorus (DP) in Guanting Reservoir.
  • To establish a robust load model for DN and DP based on experimental data.
  • To analyze the spatial distribution of DN and DP pollution loads using geospatial data.

Summary:

  • Artificial rainfall experiments demonstrated a high correlation (R² > 0.98) between runoff and the transport rates of DN and DP.
  • A novel DN/DP load model was developed based on these strong correlations.
  • Spatial analysis using DEM, land use, and soil maps indicated irrigable land as the primary source of DN, followed by mounds and hills.

Impact:

  • Provides a scientifically validated model for predicting DN and DP pollution loads.
  • Enables targeted management strategies to mitigate nonpoint source pollution in reservoir catchments.
  • Enhances understanding of pollutant origins, aiding in the protection of drinking water sources.