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Global change factors differ in effect when acting alone and in a multi-factor background.

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Urban soils face multiple global change stressors. Removing specific factors, rather than targeting isolated effects, generally improves soil health and biological processes in these complex environments.

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Area of Science:

  • Environmental Science
  • Soil Science
  • Ecology

Background:

  • Ecosystems are increasingly impacted by multiple global change factors.
  • Urban soils are particularly vulnerable to a combination of stressors including heat, drought, road salt, nitrogen deposition, surfactants, and microplastics.
  • The combined effects of these stressors can be unpredictable and differ significantly from their individual impacts.

Purpose of the Study:

  • To identify which individual global change factors have the most negative effects in a multifactorial urban soil context.
  • To understand the impact of removing specific stressors from a complex mixture of environmental factors.

Main Methods:

  • A subtractive experimental design was employed.
  • Single-factor addition treatments were compared to treatments where a specific factor was removed from a multi-factor context.
  • Soil properties and biological processes were assessed.

Main Results:

  • The effects of individual factors varied, ranging from negative to positive or mixed.
  • Removing stressors from a multi-factor context generally led to improvements in soil properties and biological processes.
  • Resource-related factors enhanced microbial activity in isolation but not in the multi-factor scenario.

Conclusions:

  • The combined impact of environmental stressors often diverges from their individual effects.
  • Mitigating factors with the strongest negative influence in multi-stressor urban soil contexts is crucial for effective restoration.
  • Prioritizing interventions based on multi-stressor impacts, not just isolated effects, is recommended for ecological restoration efforts.