| 污染遗留效应改变土壤生态功能对于水分限制的响应 |
| 摘要点击 1523 全文点击 46 投稿时间：2024-11-28 修订日期：2025-03-13 |
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| 中文关键词 污染遗留效应 水分限制 微生物 生态功能 功能稳定性 |
| 英文关键词 pollution legacy effect water limitation microorganisms ecological functions functional stability |
| DOI 10.13227/j.hjkx.202411309 |
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| 中文摘要 |
| 长期环境污染可能会对土壤微生物群落及其维持的生态功能产生遗留效应. 在全球变化的背景下，污染地区可能会同时经历其他环境压力因素（如水分限制）；尽管大量研究探讨了水分限制对微生物群落及其多功能的影响，但长期污染遗留效应如何影响土壤生态功能对于水分限制的响应仍不明确. 采集了600多a重金属污染历史矿区农田土壤样品，通过室内水分梯度培养实验，结合功能指标测定和扩增子测序技术，探究了污染遗留效应下微生物及其介导的生态功能对于水分限制的响应. 结果表明，与对照土壤相比，污染土壤的微生物呼吸、碳利用效率和多重功能性在水分限制下均显著降低. 污染土壤的多重功能性与土壤水分之间存在显著的正相关关系，且污染土壤的整体功能稳定性高于对照土壤. 进一步层次分析表明，污染土壤的多重功能性主要受到土壤水分、微生物生物量碳和生物量磷的共同影响，且这三者与多重功能性之间呈显著正相关. 此外，污染遗留效应削弱了细菌多样性对于水分限制的抵抗力，并改变了微生物群落结构. 总之，污染遗留效应削弱了细菌群落和土壤功能（微生物呼吸、碳利用效率和多重功能性）对于水分限制的抵抗力，但污染土壤的整体功能稳定性较高，研究结果可为评估污染地区土壤生态功能如何响应潜在水分限制提供重要依据. |
| 英文摘要 |
| Long-term environmental pollution may have legacy effects on soil microbial communities and ecosystem functions they sustain. The contaminated areas may simultaneously experience other environmental stressors （e.g.， water limitation） in the context of global change. Although several studies have reported the effect of water limitation on microbial communities and their multiple functions， how the legacy effects of long-term pollution influence the response of soil microbial and ecological functions to water limitation remains unclear. A moisture gradient incubation experiment was conducted using agricultural soil with over 600-year contaminated history， and then several functional metrics were measured after incubation. The results showed that microbial respiration， carbon use efficiency， and multifunctionality of polluted soil significantly declined under water limitation compared to that in control soil. There was a significantly positive correlation between multifunctionality and soil moisture in polluted soil， and the overall functional stability of polluted soil was higher than that of control soil. Further hierarchical partitioning analysis showed that the multifunctionality of contaminated soil was mainly affected by soil moisture， microbial biomass carbon， and microbial biomass phosphorus， which were significantly correlated with multifunctionality. Furthermore， pollution legacy effects weakened the resistance of bacterial diversity to water limitation and altered microbial community structure. In conclusion， the pollution legacy effects weakened the resistance of bacterial community and soil functions （e.g.， microbial respiration， carbon use efficiency， and multifunctionality） to water limitation， but the overall functional stability of polluted soil was higher. These findings are significant for assessing potential responses of soil ecological functions in contaminated areas to future water limitation. |
