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Global change factors differ in effect when acting alone and in a multi-factor background
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A subtractive experimental design in urban soils found that removing individual global change stressors — including microplastics — from a multi-factor background generally improved soil properties and biological processes, and that the combined effects of stressors often differed from what any single factor would predict alone. This is important for understanding microplastic impacts in real-world soils, where plastic pollution rarely occurs in isolation from other stressors like heat, drought, and chemical contamination.
The presence of multiple global change factors affects most ecosystems. Urban soils face stressors like heat, drought, road salt, nitrogen deposition, surfactants, and microplastics. Given that combined factors of global change have shown unpredictable effects, we here ask which individual factors have particularly negative effects in multifactorial contexts. We explore this through a subtractive design, comparing single-factor treatments (addition) to treatments where a specific factor is removed (subtraction). The results vary from predominantly negative, positive, to mixed effects. However, removing these factors from a multi-factor context generally improves soil properties and biological processes. Resource related factors enhance microbial activity individually but show no such benefit in multi-factor scenarios. Our findings highlight that the combined effects of factors often differ from their individual impacts. In restoration, priority should be given to mitigating factors with the strongest negative influence in multi-stressor contexts, rather than targeting those with significant isolated effects.
More Papers Like This
Global change factors differ in effect when acting alone and in a multi-factor background
AI summary Read the abstract
An urban soil experiment using a subtractive design (removing individual stressors from a multi-stressor scenario including microplastics, heat, road salt, drought, nitrogen, and surfactants) found that combined stressors produce very different — often worse — effects than any single stressor causes alone. For microplastic research, the key implication is that lab studies testing microplastics in isolation likely underestimate real-world harms, because in urban soils microplastics always co-occur with multiple other stressors.
Data file
AI summary Read the abstract
Researchers investigated how multiple global change stressors — including microplastics, salinity, heat, drought, and surfactants — interact in urban soils using a subtractive experimental design, finding that combined effects frequently differ from individual impacts and that mitigating the strongest multi-stressor factors is more effective for restoration than targeting those with significant isolated effects.
Data file
AI summary Read the abstract
Researchers investigated how multiple global change stressors — including microplastics, salinity, heat, drought, and surfactants — interact in urban soils using a subtractive experimental design, finding that combined effects frequently differ from individual impacts and that mitigating the strongest multi-stressor factors is more effective for restoration than targeting those with significant isolated effects.
Data file
AI summary Read the abstract
Researchers investigated how multiple global change stressors — including microplastics, salinity, heat, drought, and surfactants — interact in urban soils using a subtractive experimental design, finding that combined effects frequently differ from individual impacts and that mitigating the strongest multi-stressor factors is more effective for restoration than targeting those with significant isolated effects.
Number and dissimilarity of global change factors influences soil properties and functions
AI summary Read the abstract
Researchers investigated how multiple environmental stressors, including microplastics, climate change, and chemical pollution, affect soil health when they act together. The study found that the more different the stressors are in how they work, the more they amplify each other's harmful effects on important soil functions like decomposition and enzyme activity.
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