Abstract: The translocation and transformation of supplemented trace Zn in drab soil is studied with radioactive isotope tracer and chemical fractional extraction methods.It is found that at initial stage, most of soil ⁶⁵Zn is in exchangeable and carbonate bound forms, and less in residual form.In the following 2 weeks, carbonate bound form is largely transformed into CFeOX and RES forms.After 4 months, MnOX and CFeOX forms are tended to transform into RESform.6 months later, the bulk of ⁶⁵Zn is still in the labiler CARB and AFeOX forms.

Key words: Drab soil, Supplemented trace ⁶⁵Zn, Translocation and transformation, spatial heterogeneity, geo-satistics, GIS technique, soil phosphorus, Choerospondias axillaris deciduous broadleaved forest