Impact of Tourist Activities on Heavy Metal Pollution of Soil in the Shangri-La Scenic Area
In order to reveal the impact of tourist activities on heavy metal pollution of soil in the ShangriLa scenic area,we determined the heavy metal contents of soil samples.Then,we combined correlation analysis with the Nemerow multi-factor index method and pollution load index to track the sources of pollution and to evaluate the characteristics of heavy metal pollution.The results showed that the average contents of As,Hg,Cd,Cu,Cr,Pb and Zn of the mixed soil samples in the Shangri-La scenic area were 10.16,0.291,0.52,38.67,83.78,42.26 and 130.27 mg/kg,respectively and that the average contents of Cu,Cd,Cr,Pb and Zn in the mixed samples were 13.3％,44.8 ％,10.6％,15.4％ and 13.9％ higher than in the control samples.Besides,the contents of Cd,Hg and Cr of each sample and the contents of Cu and Zn of the mixed samples in the study area were higher than the background values of these elements in the soil of Diqing Prefecture,and Hg content of the soil collected at various sampling sites exceeded the background value by 7.45～7.53 times.Single pollution index for the performance of heavy metals was in the order of Hg＞Cd＞Pb＞Zn＞Cu＞Cr＞As.The Nemerow multi-factor index of the mixed samples was 2.7,which belongs to "moderate pollution",and their pollution load index was 1.06,while those of the control samples were 1.54 (light pollution) and 0.86,respectively,indicating that the composite samples of the study area represented a more serious degree of contamination than the control samples.The main sources of the heavy metals Cu,Cr,and Zn in the study area may be solid waste generated by tourist activities and domestic refuse,such as plastics,glass,foam and toilet paper.Dry and wet deposition was the main pathway of Hg into the soil.Tourist activities intensified Hg contamination of the soil.
tourist activityheavy metal pollution of soilShangri-La scenic area
NETL
NSTL
万方数据
维普
