水土保持研究2024，Vol.31Issue(2)：1-10,10.DOI:10.13869/j.cnki.rswc.2024.02.002
水蚀对黑土微塑料运移和分布影响的初步研究
Preliminary Study on the Effect of Water Erosion on the Transport and Distribution of Microplastics in the Mollisols
摘要
Abstract
[Objective]The aims of this study are to clarify the transport and distribution characteristics of microplastics(MPs)in soil,and provide the important basis for soil MPs pollution prevention and control,ecological safety assessment.[Methods]In this experiment,low density polyethylene MP(LDPE-MP)and low density polypropylene MP(LDPP-MP)commonly used in farmland were studied by means of artificial simulated rainfall device and fixed slope soil tank(5°)in high bulk density(1.2 g/cm3)and low bulk density(1.0 g/cm3).The loss process of MPs accompanied by surface runoff,sediment,and underground runoff,and the spatial distribution characteristics of MPs in soil trough after rainfall were explored.[Results]In different rainfall periods,the runoff increased with the increase of time,the soil erosion in the late rainfall period was less than that in the early rainfall period,and the loss concentration of MPs gradually decreased with the increase of time.The higher the soil bulk density,the smaller the MPs loss caused by surface runoff.The lower the soil bulk density,the more MPs migrated to the downslope position.The MPs loss and concentration in the leaching solution near the bottom of the slope were greater than those in the middle of the slope,and the vertical migration of MPs near the bottom of the slope was larger.The higher the soil bulk density,the higher the MPs concentration in the sediment loss.The average loss concentrations of MPs in the middle slope and lower slope of the high bulk density treatment were 3.41 and 1.96 times of those in the low bulk density treatment.In the same rainfall period,both rainfall infiltration and soil loss of high bulk density treatment were negatively correlated with MPs loss concentration,while rainfall infiltration of low bulk density treatment was positively correlated with MPs loss concentration.After water erosion,MPs concentration in the top slope of low bulk density treatment increased with the increase of soil depth.Compared with the initial MPs concentration,MPs concentration in the middle soil layer of the middle slope significantly decreased,which was in the low bulk density treatment,and MPs concentration in all soil layers of the bottom slope significantly decreased.In the treatment of high bulk density,MPs concentration in the middle and bottom soil layers of the bottom slope significantly decreased.[Conclusion]MPs in rainfall erosion process mainly migrate with surface sediment,and surface runoff and infiltration change the horizon-tal and vertical distribution of MPs in soil at the same time.关键词
水蚀/微塑料/入渗/迁移/时空分布Key words
water erosion/microplastics/infiltration/migration/spatiotemporal distribution分类
农业科技引用本文复制引用
王琬,张少良,刘旭,王玖琪,闫鹏科,李传宝..水蚀对黑土微塑料运移和分布影响的初步研究[J].水土保持研究,2024,31(2):1-10,10.基金项目
国家自然科学基金面上项目"侵蚀黑土耕层微塑料分布和运移机制"(42177321) （42177321）
