附着在不同微塑料表面的藻类结构与群落组成

选取水环境中常见的4种微塑料介质（聚丙烯（PP）、聚氯乙烯（PVC）、聚乙烯（PE）、聚对苯二甲酸乙二醇酯（PET））和一种自然介质（鹅卵石）进行野外生物膜的培养，以探究不同类型介质表面附着的生物膜的表观结构和藻类群落组成的差异特征.结果表明，鹅卵石与微塑料介质上的生物膜的形貌结构及藻类含量与组成特性均存在一定差异：在微塑料介质表面附着的藻类叶绿素a浓度普遍低于自然介质.实验进一步发现，不同的微塑料类型同样会对生物膜藻类含量以及功能特性存在一定影响：PET片上附着的藻类叶绿素a浓度最高（613.7μg/L），PP片上最低（492.5μg/L）；然而，PP片上藻类的光合作用最大量子产量最高（0.443）.以上结论说明微塑料会改变附着藻类的生长情况和初级生产力，进而可能影响生物膜在水体中的碳循环过程，对水体净化及污染治理产生一定影响.

Structure and community composition of algae attached to different microplastic substrates

To investigate the structure of biofilms and community composition of algae attached to the surface of common microplastic substrates, four types of microplastics (polypropylene (PP), polyvinyl chloride (PVC), polyethylene (PE), polyethylene terephthalate (PET) and a natural substrate (cobblestone) were selected to conduct field incubation of biofilms. The result showed that the morphology and structure of the biofilms were different between cobblestones and microplastic substrates, as well as in the contents and composition of algae. The chlorophyll-a contents in algae attached to the microplastic substrates were generally lower than those in natural substrate. Moreover, different algae content and functional characteristics were also observed from thefour microplastics. The highest chlorophyll-a content of algae was observed on PET substrate (613.7μg/L) and the lowest on PP substrate (492.5μg/L), although the maximal quantum yield of algae on PP substrate was the highest (0.443). These results suggested that the microplastic substrates could influence the growth and primary production of periphytic algae, which might further affect the microbial-associated carbon cycling in aquatic systems, water purification, and pollution treatment.