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Related Experiment Video

Updated: Mar 13, 2026

Manufacturing Simple and Inexpensive Soil Surface Temperature and Gravimetric Water Content Sensors
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Spatial and Temporal Variation in Competitive Effects on Soil Moisture and Pine Response.

R J Mitchell, B R Zutter, T H Green

    Ecological Applications : a Publication of the Ecological Society of America
    |February 1, 1993
    PubMed
    Summary

    Plant life-forms like broomsedge and sweetgum impact soil moisture for loblolly pine seedlings. Water stress integrals, influenced by these plants, significantly affected pine seedling growth.

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    Area of Science:

    • Ecology
    • Plant Biology
    • Forestry

    Background:

    • Competition for resources like soil moisture is crucial for seedling establishment.
    • Different plant life-forms, such as grasses and trees, can alter soil moisture dynamics.
    • Understanding these interactions is key to managing forest ecosystems and reforestation efforts.

    Purpose of the Study:

    • To investigate the effects of broomsedge (Andropogon virginicus) and sweetgum (Liquidambar styraciflua) on soil moisture.
    • To determine how these plant life-forms influence the competitive responses of loblolly pine (Pinus taeda) seedlings.
    • To assess the relationship between soil water availability and loblolly pine seedling growth.

    Main Methods:

    • Field experiment involving transplanted loblolly pine seedlings.
    • Addition of broomsedge and/or sweetgum to manipulate plant life-forms.
    • Measurement of soil moisture at different depths (0-14 cm and deeper).
    • Assessment of seedling water status using predawn xylem pressure potential.
    • Calculation of a water stress integral to quantify temporal water availability.

    Main Results:

    • Broomsedge and/or hardwood sprouts had variable effects on surface soil moisture, sometimes increasing it.
    • Sweetgum and/or broomsedge significantly decreased soil moisture in deeper soil layers during summer.
    • The water stress integral, reflecting temporal soil moisture availability, explained over 50% of the variation in loblolly pine seedling size after one growing season.

    Conclusions:

    • Plant life-forms like broomsedge and sweetgum significantly alter soil moisture availability for competing loblolly pine seedlings.
    • Water stress, quantified by the water stress integral, is a primary driver of loblolly pine seedling growth in competitive environments.
    • These findings highlight the importance of considering plant community composition in predicting seedling success and managing forest regeneration.