Journal of Ecology and Rural Environment ›› 2022, Vol. 38 ›› Issue (9): 1204-1210.doi: 10.19741/j.issn.1673-4831.2021.0807

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Spatial Distribution and Source Analysis of Soil Heavy Metals in Lujiang County Based on Unmix Model

WU Jing1, FANG Feng-man1,2, MA Kang1, LIN Yue-sheng1,2, GE Lei1, CHEN Hui1, ZHOU Hao1   

  1. 1. School of Geography and Tourism, Anhui Normal University, Wuhu 241003, China;
    2. Anhui Key Laboratory of Earth Surface Processes and Regional Response in the Yangtze-Huaihe River Basin, Wuhu 241003, China
  • Received:2021-12-24 Online:2022-09-25 Published:2022-09-21

Abstract: To explore the distribution and sources characteristics of soil heavy metals As, Cr, Cu, Ni, Pb, V and Zn in Lujiang County, surface soil samples were collected by using grid point method. The spatial distribution data of heavy metals and the Unmix model were jointly adopted to explain the sources of heavy metals. The results show that the As and Cu contents of a few soil samples in the study area exceeded the standard values. In addition, the contents of other heavy metals only exceeded the standard at individual sites. The spatial distribution of soil heavy metal content in Lujiang County generally showed a decreasing trend from southeast to northwest. Among them, in the southeast, the enrichment of As, Cu, Pb and V in the soil was higher than that in other areas. Parent material sources, industrial sources and mining sources were the main sources of heavy metals in local soils, and their contribution to soil heavy metals accounted for 47%, 28%, and 25%, respectively. Among them, the parent material source was the main source of local soil heavy metals. As, V and Zn in soil were affected by all the three sources. Cr and Ni were mainly derived from parent materials, Cu was mainly derived from mining activities, and Pb was mainly derived from industrial activities. The study can provide theoretical support for the control and governance of local soil heavy metal pollution.

Key words: soil heavy metal, Unmix model, spatial distribution, source analysis, Lujiang County

CLC Number: