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Related Concept Videos

The Phosphorus Cycle01:21

The Phosphorus Cycle

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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.
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Like all living organisms, plants require organic and inorganic nutrients to survive, reproduce, grow and maintain homeostasis. To identify nutrients that are essential for plant functioning, researchers have leveraged a technique called hydroponics. In hydroponic culture systems, plants are grown—without soil—in water-based solutions containing nutrients. At least 17 nutrients have been identified as essential elements required by plants. Plants acquire these elements from the...
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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...
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Related Experiment Video

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Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment
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Soil phosphorus landscape models for precision soil conservation.

Jinseok Hong, Sabine Grunwald, Gustavo M Vasques

    Journal of Environmental Quality
    |May 30, 2015
    PubMed
    Summary
    This summary is machine-generated.

    Soil phosphorus (P) models were developed for the Santa Fe River watershed. Land use, vegetation, and geology best predicted soil P distribution, aiding precision soil conservation and environmental protection.

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    Area of Science:

    • Environmental Science
    • Soil Science
    • Geospatial Analysis

    Background:

    • Phosphorus (P) enrichment is a concern in the Santa Fe River watershed (SFRW).
    • Environmental factors controlling soil P distribution and water quality impacts are not fully understood.
    • A precision soil conservation approach requires fine- and coarse-scale soil P assessment.

    Purpose of the Study:

    • Develop soil-landscape P models for the SFRW.
    • Identify key environmental properties influencing soil P spatial distribution.
    • Assess soil P patterns using geostatistical methods and validate model quality.

    Main Methods:

    • Collected soil P data at 137 sites and fused with environmental covariates.
    • Developed univariate (lognormal kriging, LNK) and multivariate (regression kriging, RK, cokriging, CK) prediction models.
    • Validated models using independent sampling sites.

    Main Results:

    • Multivariate models (RK, CK) incorporating environmental data improved soil P prediction over LNK.
    • Land use, vegetation (topsoil), and geologic data (subsoil) were the most predictive covariates.
    • Models accurately predicted spatial patterns of soil Mehlich-1 extracted P (MP).

    Conclusions:

    • Environmental covariates significantly enhance soil P prediction accuracy.
    • Developed models support precision soil conservation in the SFRW.
    • Findings improve understanding of soil P interactions for better land management and environmental risk reduction.