Spatial differentiation and influencing factors of heavy metals in soils of typical counties in Lhasa river basin.

The high value areas of Cu were concentrated in the northwest region, with a maximum value of 85 mg·kg − 1 , and showed a decreasing trend from north to south.It might be due to the concentration of industrial activities in the region, coupled with possible topographical and hydrological conditions, leading to the natural enrichment of copper and the cumulative effect of human emissions.

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With the rapid development of social economy, the content of soil HMs shows an increasing trend and is widely distributed.

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