Publishcation Main Content(highlights):
The spatiotemporal occurrence characteristics of soil microplastics (MPs) in an intensive agricultural catchment were firstly revealed, and the "source-sink" relationship of catchment MPs under the background of land management policy shifting was analyzed. • MP abundance peaked in November 2022 and varied by land use types, with cropland converted from forest (C(F)) and crop farmland (C) being the highest and vegetable farmland (V) being the lowest on average. • Predominance of MP < 500 μm in size, with primary polymers PA, PP and PE. • F+C(F) was the dominant sediment source (50.14 ± 0.27%), whose MP export loads were also significantly higher than C and V.
