• 论文 •

珠三角土壤镉含量时空分布及风险管理

1. 1. 海南师范大学地理与旅游学院, 海南海口571158;
2. 中山大学地球科学与地质工程学院, 广东广州510275;
3. 广东省地质调查院, 广东广州510080
• 收稿日期:2014-03-06 修回日期:2014-07-19 出版日期:2015-03-20 发布日期:2015-03-20
• 作者简介:李勇(1980-),男,湖南武冈人,副教授,博士,主要从事土壤地球化学与健康研究。E-mail:107084841@qq.com
• 基金资助:

海南师范大学博士科研启动基金(00301203042)、海南省旅游发展委员会项目(HSHX2013-52)资助。

Prediction and Risk Management on Geochemical Accumulation of Soil Cadmium based on Time-Space Model in Zhujiang River Delta

LI Yong1, YU Tian-hong1, ZHAO Zhi-zhong1, ZHOU Yong-zhang2, DOU Lei3, HE Xiang3

1. 1. School of Geography and Tourism, Hainan Normal University, Haikou, Hainan 571158, China;
2. School of Earth Science and Geological Engineering, Sun Yat-sen University, Guangzhou, Guangdong 510275, China;
3. Guangdong Geologic Survey Insitute, Guangzhou, Guangdong 510080, China
• Received:2014-03-06 Revised:2014-07-19 Online:2015-03-20 Published:2015-03-20

Abstract:

In order to measure the contents of Cadmium (Cd), 98 topsoil samples were collected from the same points of the Zhujiang River Delta in the years of 2001 and 2007, respectively. Based on 98 soil samples, the spatial and temporal distribution of soil Cadmium concentrations was explored, in which risk management strategies were discussed. The results showed that the extent of soil Cadmium was highly enriched, the mean concentrations of soil Cadmium in the two periods was 0.28 mg/kg, which was 5 times more than its soil background values of Guangdong Province (0.06 mg/kg); Both mean values for multiple comparisons showed that the Cadmium mean change reached a significant level. The coefficients of variation of soil Cadmium were 0.83 and 0.72, respectively, which indicated that the Cadmium sources were mainly from anthropogenic activity. Based on the model of Soil heavy metal accumulation rate of two periods,the annual regional soil Cadmium accumulation rates from 2001 to 2007 were 0.016 mg/kg, while from 2007 to 2012 the average annual regional soil Cadmium accumulation rate was 0.014 mg/kg. The temporal and spatial distribution trend of soil Cadmium is predicted, using two models, namely time-space mode and space-time mode. In the case of less time-series data, time-space mode is more robust predictions. Soil in most of area will be contaminated by Cadmium in 2020. Therefore, there are three strategies in future risk management: 1) to take preventive strategies in non-polluting area; 2) to take control strategies in the contaminated area; 3) to take repair strategies in heavily polluted area.

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