What does this research mean for the field?

The combined effects of climate warming and nitrogen enrichment on soil biological and biogeochemical functions are largely additive overall, though this masks significant process-dependent non-additive interactions, such as negative interactions for microbial attributes. Novelty: ClaimNovelty.SYNTHESIS. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To evaluate whether the combined effects of climate warming and anthropogenic nitrogen enrichment on soil biological and biogeochemical functions represent true non-additive interactions.

September 3, 2026European Journal of Soil ScienceOpen Access

Warming × Nitrogen Interactions Across Soil Biological and Biogeochemical Functions: A Factorial Meta‐Analysis

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Authors

JZJiayang ZongBeijing Forestry University JWJiayuan WangSouthern University of Science and Technology XSXiangyang SunInstitute of Genetics and Developmental Biology

Discussion

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Implication

Factorial meta-analysis finds overall additive warming and nitrogen effects in soil ecosystems, highlighting that broad additivity masks divergent non-additive microbial and carbon responses.

Key Points

To evaluate whether the combined effects of climate warming and anthropogenic nitrogen enrichment on soil biological and biogeochemical functions represent true non-additive interactions.
Synthesized 1,774 effect sizes from 26 independent experimental platforms using factorial designs with control, warming, nitrogen addition, and combined warming plus nitrogen treatments.
Conducted meta-analyses using cluster-robust variance estimation with the CR2 small-sample correction across six soil functional modules on the natural-log response ratio scale.
Pooled single and combined treatments yielded positive responses of +2.15% (warming), +3.44% (nitrogen), and +5.84% (combined), with an overall non-significant interaction of -0.54% (95% CI, -4.51% to 3.59%; p = 0.794).
Microbial attributes exhibited a significant negative interaction (-11.01%, p = 0.001; CR2 p = 0.045), which was primarily driven by reductions in microbial biomass.
Carbon-pool variables showed a positive interaction trend (+7.81%, p = 0.043), though this effect attenuated to +6.93% (p = 0.134) after excluding methodologically complex variables.

Cite This Study

Zong et al. (2026) studied this question.

synapsesocial.com/papers/6a99353a636c6408cfa7d3cd https://doi.org/10.1111/ejss.70411

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September 3, 2026European Journal of Soil ScienceOpen Access

Warming × Nitrogen Interactions Across Soil Biological and Biogeochemical Functions: A Factorial Meta‐Analysis

View Full Paper

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Bookmark

Authors

JZJiayang ZongBeijing Forestry University JWJiayuan WangSouthern University of Science and Technology XSXiangyang SunInstitute of Genetics and Developmental Biology

Discussion

Member takes

Implication

Factorial meta-analysis finds overall additive warming and nitrogen effects in soil ecosystems, highlighting that broad additivity masks divergent non-additive microbial and carbon responses.

Key Points

To evaluate whether the combined effects of climate warming and anthropogenic nitrogen enrichment on soil biological and biogeochemical functions represent true non-additive interactions.
Synthesized 1,774 effect sizes from 26 independent experimental platforms using factorial designs with control, warming, nitrogen addition, and combined warming plus nitrogen treatments.
Conducted meta-analyses using cluster-robust variance estimation with the CR2 small-sample correction across six soil functional modules on the natural-log response ratio scale.
Pooled single and combined treatments yielded positive responses of +2.15% (warming), +3.44% (nitrogen), and +5.84% (combined), with an overall non-significant interaction of -0.54% (95% CI, -4.51% to 3.59%; p = 0.794).
Microbial attributes exhibited a significant negative interaction (-11.01%, p = 0.001; CR2 p = 0.045), which was primarily driven by reductions in microbial biomass.
Carbon-pool variables showed a positive interaction trend (+7.81%, p = 0.043), though this effect attenuated to +6.93% (p = 0.134) after excluding methodologically complex variables.

Cite This Study

Zong et al. (2026) studied this question.

synapsesocial.com/papers/6a99353a636c6408cfa7d3cd https://doi.org/10.1111/ejss.70411

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