| 【Objective】In order to provide a reference basis for the evaluation of soil environmental qualityand
potential risks in the Illicium verum production areas, the heavy metal pollution levels of forest soil in the main production
areas of I. verum in Yunnan were detected.【Method】The soil of I. verum forest land in seven counties of Wenshan
County, Yunnan Province was studied. Eight heavy metal indexes of As, Cd,Cu, Cr, Pb, Hg, Zn and Ni were determined,
and the pollution risks of soil heavy metals in forest land were evaluated by using individual and comprehensive pollution
indexes.【Result】The coefficients of variation of heavy metals ranged from 7.11% to 18.75% in the test areas, and the average content of heavy metals Hg, As, Pb and Cr exceeded the background value of soil heavy metals in Yunnan Province,
and that of As, Pb, and Cu exceeded the risk screening value. Pollution evaluation showed that the average value of single factor
pollution index of As was 1.99, which was the alert level, and the Nemero comprehensive pollution index was evaluated as light
pollution. The potential ecological risk factor and potential ecological risk index were both at low risk level, among which the
ecological risk factor of Cd was the highest. The geological accumulation index values of Hg and As were between 1 and 2, and
the pollution level was classified as moderate. Cluster analysis indicated that the soil heavy metals As, Pb, Cd, Cu, Zn, and Hg
of the forest land were mainly influenced by soil parent matter and human activities, and the Cr and Ni were of similar sources,
mainly from natural sources.【Conclusion】The contents of heavy metals of soil in I. verum planting area of Yunnan Province
were significantly different, which were jointly influenced by human activities and soil parent matter, and part of heavy metals in
some areas exceed the standard to a certain extent. |
