Soil copper sources and biogeochemical processes under different land uses: insights from stable copper isotopes in the Cambisols of Southwest China.

ABSTRACT: Copper (Cu), a toxic trace element, has extensively accumulated in soils due to intensive human activities. Yet current knowledge on Cu sources and biogeochemical processes in Cambisols under varying land uses is scant. In this study, Cu contents, stable isotope compositions (δ⁶⁵Cu) and their correlations with soil physicochemical properties in soil profiles across different land uses were analyzed, including cropland, abandoned cropland and orchard, shrub-grass land, and secondary forest in a karst watershed of Southwest China. Soil Cu contents in cropland (mean 44.9 mg kg ^-1) were significantly higher than those in abandoned cropland and orchard (mean 37.7 mg kg ^-1), and much higher than those in natural lands (mean 26.3 mg kg ^-1). In agricultu

SUBMITTER: Liu M 

PROVIDER: S-EPMC12422267 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature