四川林业科技2026，Vol.47Issue(1)：20-30,11.DOI:10.12172/202510160001
云岭拉沙山流域微塑料分布水陆差异研究
Distribution of microplastics across terrestrial and aquatic compartments in Lasha Mountain watershed,Yunling Mountains
摘要
Abstract
As emerging environmental contaminants,the flux and mechanisms of microplastic transport from terrestrial areas to water bodies represent a critical focus of current research.Within this context,an in-depth investigation into the distribution differences of microplastics between aquatic and terrestrial compartments in high-mountain headwater catchments is essential for a comprehensive understanding of their source-to-sink processes.This study was conducted in Lasha Mountain watershed,Yunling Mountains,a tributary of the Lancang River.By collecting both aquatic sediments and terrestrial soil samples,the distribution differences,compositional characteristics,and transport patterns of microplastics within this catchment was studied.The results indicated that:(1)The overall level of microplastic pollution in the catchment was relatively low,with average abundances in aquatic sediments and terrestrial soils of(30.74±16.97)×104 items/m3 and(19.81±18.41)×104 items/m3,respectively;(2)No significant difference in microplastic abundance was found between aquatic and terrestrial compartments in the upstream area,whereas abundances in midstream and downstream aquatic sediments were significantly higher than in adjacent soils,confirming surface runoff as a key process driving terrestrial-to-aquatic translocation and enrichment;(3)The particle size of aquatic microplastics showed a fining trend longitudinally along the river,with increasing proportions of small and medium-sized particles and a decreasing proportion of large particles,indicating physical fragmentation caused by hydraulic abrasion;(4)Analysis of color and shape composition revealed that blue,black,and white fibers and fragments were the overwhelmingly dominant types,suggesting that the microplastics in this catchment primarily originate from daily life and agricultural activities.This study confirmed that even in a high-altitude catchment with minimal direct human disturbance,natural hydraulic processes remain a key factor driving the terrestrial-aquatic translocation and downstream evolution of microplastics.These findings enhance the understanding of microplastic transport behavior in natural environments and provide a scientific basis for pollution control in headwater regions.关键词
微塑料/水陆迁移/高山流域/空间分布/拉沙山/澜沧江Key words
microplastic/aquatic-terrestrial migration/alpine catchment/spatial distribution/Lasha Mountain watershed/Lancang River引用本文复制引用
凌鑫磊,陈守盟,高玉婷,杨耀权,杨敏,李延鹏..云岭拉沙山流域微塑料分布水陆差异研究[J].四川林业科技,2026,47(1):20-30,11.基金项目
云南省科技厅科技计划项目(202105AM070008) （202105AM070008）
