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Root effects on soil organic carbon: a double-edged sword.

Feike A Dijkstra1, Biao Zhu2, Weixin Cheng3

  • 1Sydney Institute of Agriculture, School of Life and Environmental Sciences, The University of Sydney, Camden, NSW, 2570, Australia.

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Summary

Plant roots create a paradox in soil organic carbon (SOC), stabilizing it for accrual yet destabilizing it for loss. The new Rhizo-Engine framework explains these dual effects, aiding carbon sequestration research.

Keywords:
microbial turnovermineral associated organic carbonnutrient and water uptakerhizodepositionrhizosphere priming effectsoil aggregation

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Area of Science:

  • Soil Science
  • Ecology
  • Biogeochemistry

Background:

  • Roots play a dual role in soil organic carbon (SOC) dynamics, paradoxically driving both SOC stabilization (accrual) and destabilization (loss).
  • Understanding these root-driven SOC processes is crucial for predicting soil carbon sequestration and responses to environmental change.

Purpose of the Study:

  • To synthesize current knowledge on root-soil organic carbon interactions.
  • To propose a new conceptual framework, the Rhizo-Engine, to explain these dynamics.
  • To highlight the need for a holistic approach in studying root effects on soil carbon.

Main Methods:

  • Literature synthesis of recent developments in root-soil organic carbon research.
  • Development of the Rhizo-Engine conceptual framework, integrating microbial turnover and soil physicochemical matrix.
  • Identification of key drivers: rhizodeposition, root turnover, and plant nutrient/water uptake.

Main Results:

  • The Rhizo-Engine framework integrates microbial turnover and the soil physicochemical matrix to explain root-driven SOC dynamics.
  • Rhizodeposition, root turnover, and plant uptake are identified as key drivers accelerating SOC turnover via stabilization and destabilization.
  • The framework reconciles the apparent paradox of roots causing both SOC accrual and loss.

Conclusions:

  • The Rhizo-Engine framework offers a holistic approach to understanding root-soil organic carbon interactions.
  • This framework improves our comprehension of soil carbon sequestration and the sensitivity of SOC stocks to climate and land-use changes.
  • Further research utilizing this framework is needed to refine predictions of soil carbon dynamics.