Identifying factors that influence soil heavy metals by using categorical regression analysis: A case study in Beijing, China
Jun Yang1,2(), Jingyun Wang1,2, Pengwei Qiao4, Yuanming Zheng3, Junxing Yang1,2, Tongbin Chen1,2, Mei Lei1,2, Xiaoming Wan1,2, Xiaoyong Zhou1
1. Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China 2. University of Chinese Academy of Sciences, Beijing 100049, China 3. Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China 4. Beijing Key Laboratory of Remediation of Industrial Pollution Sites, Environmental Protection Research Institute of Light Industry, Beijing 100048, China
A method was proposed to identify the main influence factors of soil heavy metals.
The influence degree of different environmental factors was ranked.
Parent material, soil type, land use and industrial activity were main factors.
Interactions between some factors obviously affected soil heavy metal distribution.
Identifying the factors that influence the heavy metal contents of soil could reveal the sources of soil heavy metal pollution. In this study, a categorical regression was used to identify the factors that influence soil heavy metals. First, environmental factors were associated with soil heavy metal data, and then, the degree of influence of different factors on the soil heavy metal contents in Beijing was analyzed using a categorical regression. The results showed that the soil parent material, soil type, land use type, and industrial activity were the main influencing factors, which suggested that these four factors were important sources of soil heavy metals in Beijing. In addition, population density had a certain influence on the soil Pb and Zn contents. The distribution of soil As, Cd, Pb, and Zn was markedly influenced by interactions, such as traffic activity and land use type, industrial activity and population density. The spatial distribution of soil heavy metal hotspots corresponded well with the influencing factors, such as industrial activity, population density, and soil parent material. In this study, the main factors affecting soil heavy metals were identified, and the degree of their influence was ranked. A categorical regression represents a suitable method for identifying the factors that influence soil heavy metal contents and could be used to study the genetic process of regional soil heavy metal pollution.
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