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Figure S1. Schematic drawing of throughfall/precipitation ion exchange resin collectors used in this study.

Table S1. Site characteristics along an urban-rural transect in southern China.

Table S2. Sampling date of ion exchange resin columns, soil and leaf, and stream water during the study period.

Table S3. Bulk deposition or throughfall N input along the urban-rural transect (kg N ha-1 yr-1).

Table S4. Foliar δ15N, C and N concentrations, and C/N ratios for each sampled species in 13 forests along the transect.

Table S5.δ15N values and %N for foliage, forest floor, and mineral soil from 14 forests along the transect.

Table S6. C/N ratios for foliage, forest floor, and mineral soil from 14 forests along the transect.

Table S7. Selected characteristics of the 0–10 cm mineral soil from 14 forests along the transect.

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