Making Waves: Modeling bioturbation in soils - are we burrowing in the right direction?

Area of Science:

• Soil science and ecology
• Environmental science
• Biogeochemistry

Background:

• Organism activities like burrowing cause significant soil and sediment mixing, termed bioturbation and sediment reworking, respectively.
• While extensively studied in aquatic sediments, the impact of soil bioturbation on particle translocation is less understood.
• Existing soil models often borrow from aquatic ecology, potentially leading to inaccuracies.

Purpose of the Study:

• To identify limitations of applying sediment reworking models to soil bioturbation.
• To explore how advances in aquatic ecology can inform soil bioturbation modeling.
• To propose foundational steps for developing accurate soil bioturbation models.

Main Methods:

• Comparative analysis of soil bioturbation and aquatic sediment reworking studies.
• Review of current modeling approaches and their underlying assumptions.
• Identification of knowledge gaps and potential research directions.

Main Results:

• Current soil bioturbation models, adapted from aquatic systems, may be based on untested hypotheses.
• This can lead to an inaccurate prediction of organic matter turnover and contaminant transport in soils.
• There is a need for soil-specific data to validate and refine these models.

Conclusions:

• Models for soil bioturbation require validation with empirical soil data, not just adaptation from aquatic environments.
• Integrating recent aquatic ecology findings could improve soil bioturbation models.
• Accurate modeling of soil organic matter turnover, soil evolution, and contaminant transport depends on robust soil bioturbation models.