IHSS&IWA26 / BRNO / CZECHIA / 23–28 August 2026 BOOK OF ABSTRACTS 156 Environment, Agriculture, and Forestry Friday, 28 August 2026 / Hall C SL79 Multi-Stressor Environments Shape Soil Microbial Biodiversity, Genomic Strategies and Phosphorus Cycle Zhongmin Dai1, Shuxun Cheng2, Jianming Xu3 1 Institute of Soil and Water Resources and Environmental Science, College of Environmental and Resource Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, China, zmdai@zju.edu.cn 2 Institute of Soil and Water Resources and Environmental Science, College of Environmental and Resource Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, China 3 Institute of Soil and Water Resources and Environmental Science, College of Environmental and Resource Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, China Soil microorganisms represent the largest component of Earth’s biodiversity, yet how they respond to multiple concurrent environmental stressors across large spatial scales remains poorly understood. In this study, we conducted a comprehensive cross-ecosystem field survey to investigate how multiple environmental stressors shape soil microbial community composition, genomic traits, and functional potential. Our results show that as the number of high-level stressors increases, the abundance and diversity of rare microbial taxa decrease. In contrast, unknown taxa and genes become increasingly enriched. Analysis of metagenomeassembled genomes from common taxa revealed that many exhibit resistance or positive responses to multiple stressors. Using phosphorus (P) cycling functional potentials as indicators, we found that interactive effects of multiple stressors significantly affected the abundance and diversity of P-cycling microorganisms, and these interactive effects were more prevalent than individual stressor effects. This suggests that stressor interactions strongly influence microbially mediated P cycling and P availability in soil. Overall, our findings indicate that multi-stressor environments drive soil microbial communities toward dominance by unknown and stress-adapted lineages with important implications for ecosystem P cycling and functioning under global change. Acknowledgement This study was supported by the National Science Foundation of China (42577323), the National Key Research and Development Program of China (2023YFD1501700).
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