doi:10.16186/j.cnki.1673-9787.2020.5.9

Received:2019/12/17

Revised:2020/03/09

Published:2020/09/15

Regional classification of heavy metal pollution risk in cultivated soil based onanalytic hierarchy process

PENG Limei1,2,3,4, ZHAO Li1,2,3,4,5, ZHOU Wu1,2,3,4,5, HU Yueming1,2,3,4,5,6,7

1.College of Natural Resources and Environment， South China Agricultural University， Guangzhou  510642 ， Guangdong， China；2.Key Laboratory of Land Redevelopment of Ministry of Land and Resources， Guangzhou  510642 ， Guangdong， China；3.Guangdong Province Key Laboratory for Land Use and Consolidation，Guangzhou  510642，Guangdong，China；4.Guangdong Province Land Information Technology， Engineering Research Center，Guangzhou  510642，Guangdong，China；5.South China Academy of Natural Resources，Guangzhou  510642 ， Guangdong，China；6.State Key Laboratory of Three Rives Ecology and Plateau Agriculture and Animal Husbandry，Qinghai University，Xining  810016，Qinghai，China；7.College of Resources and Environment，Electronic Science and Technology University，Chengdu  610054 ， Sichuan，China

Abstract:With the acceleration of urbanization，industrialization and agricultural modernization， excessive heavy metals have entered the soil，which results in a decline of the cultivated land soil quality，soil productivity and food security，and poses a serious threat to human health and the balance of regional ecosystem. Scientific evaluation of the current situation of soil heavy metal pollution in this region and regional division of pollution risks are of great significance to the local social and economic development and the acceleration of ecological civilization construction. In this paper， based on the analytic hierarchy process，eight factors，including organic matter content， soil pH，altitude，slope，road distance，river distance，factory distance and residential distance were selected to constitute an evaluation index system， and regional division of pollution risk of five heavy metals （Cd，Hg，As，Pb， Cr） in cultivated soil in Conghua district of Guangzhou city was conducted. The results showed that Cd and Hg were the main risk factors of heavy metals in soil in Conghua district，which were mainly distributed in the northeast of Aotou town， the south of Taiping town，the east of Wenquan town and the middle of Lyutian town. The risk levels of heavy metal Pb and As were similar. Heavy metal Cr had the lightest risk to cultivated land pollution. The Kappa coefficient of each heavy metal risk classification result was higher than 0.4，indicating that the classification quality was good and the accuracy met the requirements.

Key words:cultivated soil;heavy metal pollution risk;regional classification;analytic hierarchy process;Conghua district， Guangzhou city

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