Affiliations: Lab.for Wetland Process and Environment,Changchun
Institute of Geography,Chinese Academy of Sciences,Changchun 130021,China
Abstract: The characteristics of vertical and horizontal variations of lead
element (Pb) in soil-plant system of vertical zone in Changbai Mountain
National Nature Reserve (CNNR) were studied.The results showed that Pb
concentrations in soils of vertical zone are all above 25 mg/kg,and the average
Pb concentration of each soil zone negatively correlates its degree of
variation, i.e.brown coniferous forest soil zone has the lowest average Pb
concentration of four soil zones,and the highest horizontal variation;
however,mountain soddy forest soil has the highest average Pb concentration,and
the lowest horizontal variation; the average concentration of plant Pb of each
plant zone is lower than the worldwide average level of Pb in plant (Clarke),
respectively, and plant Pb content order is consistent with soil Pb content
order,but their horizontal variations are different from those in soil zones,
the variation of mountain tundra forest zone is highest, but Betula ermanii
forest zone the lowest.Vertical variation of plant Pb is obviously higher than
that in soils with variation coefficient of 89.76%; the enrichment capability
of plant for Pb is depended on the plant types and the different organs of
plant; parent material and parent rock, pH values,soil organic matter and soil
particle fraction etc.are the main factors influencing variations of Pb content
in soil-plant system of vertical zone in CNNR.
