| Abstrakt: |
The main objectives were to investigate the concentrations of heavy metal in Guilin vegetable topsoils by conducting geostatistical analyses, including Kriging method assisted with GIS tool. These results will contribute to the management of regional environment. A total of one hundred and eighty-six samples of topsoils (0~20cm) were collected from all over Guilin, China. Concentrations of topsoil Cu, As, Ni, Zn, Pb and Cd in Guilin area were measured and contour maps were constructed to describe the metals’ spatial distribution. The concentrations of heavy metals in vegetable soil are in log-normal distribution, so the Geometric means of Cu, As, Ni, Zn, Pb and Cd are 28.30, 20.00, 23.97, 91.01, 36.76 and 0.62 mg/kg, respectively. Concentration of 6 heavy metals were comparable with background values of Guilin except Cd, but all of them were much lower than the second level of environmental quality standard for soil of China. |
