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Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity
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Niche theory for positive plant-soil feedbacks.

Athmanathan Senthilnathan1, Rafael D'Andrea1

  • 1Department of Ecology and Evolution, Stony Brook University, Stony Brook, New York, USA.

Ecology
|February 15, 2023
PubMed
Summary

Plants actively change soil conditions, creating bidirectional plant-soil feedbacks. These feedbacks lead to species clustering based on soil preferences, influencing plant community structure and spatial distribution.

Keywords:
community assemblymathematical modelingplant-soil feedbacksoil conditioning

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Area of Science:

  • Ecology
  • Plant Ecology
  • Soil Science

Background:

  • Plant-soil interactions are crucial for terrestrial ecosystems, shaping plant community structure.
  • Traditionally viewed as one-directional, soil conditions filter species.
  • Plants can modify soil physicochemical properties, creating bidirectional feedbacks.

Purpose of the Study:

  • To develop a theory connecting individual-level plant-soil feedbacks to community-level patterns.
  • To mathematically model plant community dynamics with explicit, density-dependent soil conditioning.
  • To analyze long-term community composition and spatial distribution.

Main Methods:

  • Developed a mathematical model of plant community dynamics.
  • Explicitly modeled soil conditioning over time, dependent on plant density.
  • Analyzed model outputs for community composition and spatial distribution.

Main Results:

  • Positive plant-soil feedbacks cause clustering of species with similar soil preferences.
  • Cluster composition is influenced by niche width and conditioning strength.
  • Species within the same cluster maintain high relative abundance; inter-cluster competition is limited.

Conclusions:

  • Plant-soil feedbacks create distinct spatial clusters of species.
  • Dispersal ability influences patchiness, with stronger dispersers not always dominating.
  • Exogenous drivers can override plant-driven soil conditioning, leading to habitat filtering.