Abstract:
Two kinds of typical tea gardens in slope land and flat land were chosen as sampling plots in An-tea production area. The sampling belts were set by the elevation gradient and the distance away from the county-level highway in slope land and flat land, respectively. The stratified soil samples were obtained at the depth of 0-100 cm by soil drilling method, correspondently, the young and the mature tea leaf samples were gathered. The Cr, Cu, Zn, As, Cd, Pb, Ni and Hg contents of soil and leaf samples were determined by ICP-MS. The results show that the average content of Zn in tea garden of flat land is the highest, Hg and Cd are the lowest. The average contents of eight heavy metals are higher in the belt near county-level highway in flat land. The average contents of heavy metals in the 0-40 cm soil layers are increased with the vertical direction in the belt near county-level highway and near river in flat land, and decreased in middle belt. The average content of Cr, Cu and Zn in slope land increased with the elevation reduction, and that of Cd, Pb, Ni and Hg decreased, and no significant difference for As. The contents of Cr, As, Cd and Pd in tea garden of slope land are higher than that of flat land, and Cu, Zn, Ni and Hg are lower. Among the eight heavy metals in tea garden, the other heavy metals are pollution-free grade, except that As and Cd in slope land and Zn, As and Hg in flat land are slightly polluted.
