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How Microplastic Accumulation Alters Soil Hydraulic Conductivity—and Why That Matters for Urban Stormwater Management
微塑料累积如何改变土壤水力传导率——及其对城市雨水管理的意义
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Microplastics <1 mm infiltrate urban soils at median concentrations of 0.8–2.3 g/kg—primarily from tire wear, synthetic textiles, and degraded mulch.微塑料（<1毫米）以0.8–2.3克/千克的中位浓度渗入城市土壤，主要来源为轮胎磨损、合成纺织品和降解地膜。
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Their hydrophobic surfaces repel water, disrupting capillary continuity and reducing saturated hydraulic conductivity by 15–35% in engineered bioswales and green roofs.其疏水表面排斥水分，破坏毛细连续性，使人工生物滞留池和绿色屋顶的饱和导水率降低15–35%。
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Unlike clay particles, microplastics lack cation exchange capacity, diminishing soil’s ability to retain dissolved nutrients and heavy metals during storm runoff events.与黏粒不同，微塑料缺乏阳离子交换能力，削弱土壤在暴雨径流中对溶解态养分和重金属的截留能力。
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Field studies in Berlin and Toronto show that microplastic-laden bioswales exhibit 22% longer ponding durations and 30% lower infiltration rates during 10-year return-period storms.柏林和多伦多的实地研究表明，在重现期为10年的暴雨中，含微塑料的生物滞留设施积水时间延长22%，下渗速率降低30%。
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Municipal stormwater models now incorporate microplastic concentration thresholds into infiltration credit calculations—reclassifying previously approved LID (Low Impact Development) sites as non-compliant.市政雨水模型现已将微塑料浓度阈值纳入下渗信用计算，致使部分原先获批的低影响开发（LID）场地被重新归类为不合规。
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Soil microbiomes shift composition under microplastic stress: hydrocarbon-degrading bacteria proliferate, but nitrifying species decline—altering nitrogen transformation kinetics critical for pollutant attenuation.微塑料胁迫下，土壤微生物群落结构发生改变：降解烃类细菌增殖，而硝化菌减少，进而改变对污染物削减至关重要的氮素转化动力学。
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Engineered soil mixes for permeable pavements now specify polyacrylamide-free binders and require ASTM D7928 leachate screening to prevent secondary plastic migration.透水铺装所用工程土壤配比现要求使用不含聚丙烯酰胺的粘结剂，并须通过ASTM D7928浸出液筛查，以防二次塑料迁移。
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Regulatory agencies like EPA Region 3 are piloting microplastic monitoring in municipal separate storm sewer systems (MS4s), treating them as emerging contaminants rather than inert particulates.美国环保署第3分局等监管机构正试点在市政独立雨水管网（MS4）中监测微塑料，将其视为新兴污染物而非惰性颗粒物。
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Urban hydrologists argue that microplastic-induced conductivity loss contributes measurably to increased peak discharge—amplifying flood risk beyond climate-driven rainfall intensification alone.城市水文学家指出，微塑料导致的导水率下降显著加剧洪峰流量，其增益效应超出单纯气候驱动的降雨强度增加。
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Green infrastructure maintenance contracts now include mandatory soil core sampling every 3 years, with remediation triggers set at 1.5 g/kg microplastic mass loading.绿色基础设施养护合同现已强制要求每3年开展一次土壤芯样采样，当微塑料质量负荷达1.5克/千克时即触发修复程序。
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This convergence of material pollution and hydrologic function reveals how anthropogenic particles reshape biogeochemical boundaries at the urban-soil interface.材料污染与水文功能的交汇揭示了人为颗粒如何重塑城市-土壤界面的生物地球化学边界。
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Stormwater design is evolving from flow control to particle-informed ecosystem engineering—where material fate dictates hydrologic performance.雨水管理设计正从流量控制转向基于颗粒物归趋的生态系统工程——材料命运决定水文性能。