• 关键词：土壤Cd含量  影响因子  模型  广东  Cubist

• 基金项目：广东省科技计划项目（No.2014A040401059，2015A030401068，2015B070701017）；山西省科技攻关项目（No.20120311009-1）；国家自然科学青年科学基金（No.41601558）

• 孙慧
• 1. 山西农业大学资源环境学院, 晋中 030800;2. 广东省生态环境技术研究所, 广东省农业环境综合治理重点实验室, 广州 510650

• 毕如田
• 山西农业大学资源环境学院, 晋中 030800

• 袁宇志
• 广东省生态环境技术研究所, 广东省农业环境综合治理重点实验室, 广州 510650

• 柴敏
• 广东省生态环境技术研究所, 广东省农业环境综合治理重点实验室, 广州 510650

• 曹伏龙
• 1. 广东省生态环境技术研究所, 广东省农业环境综合治理重点实验室, 广州 510650;2. 广州大学地理科学学院, 广州 510006

• 张迁迁
• 山西农业大学资源环境学院, 晋中 030800

• 郭治兴
• 广东省生态环境技术研究所, 广东省农业环境综合治理重点实验室, 广州 510650

• 摘要：影响镉（Cd）含量的因子众多，包括自然影响因子和人为影响因子，而治理Cd污染首先应查明Cd污染来源及其影响因子，这对因地制宜制定Cd污染治理措施及指导相关产业布局具有重要意义.广东省地理状况复杂、经济发达，Cd含量分布区域间差异较大.因此，本文基于Cubist构建土壤Cd含量与相关影响因子关系模型，解析影响广东省土壤Cd含量的主要因子.结果表明：土壤pH值与土壤类型是影响广东省Cd含量最主要的因素，土壤Cd含量与土壤pH值呈正相关关系；赤红壤、砖红壤及紫色土中Cd含量相对较低，潮土、红壤、黄壤、水稻土及石灰土中Cd含量相对较高.Cd含量高值主要出现在第四纪、泥盆纪和石炭纪地质构造运动形成的土壤中.此外，植被指数、土壤粉粒、平均气温、高程、距道路及距河流距离也是影响广东省土壤Cd含量的主要因素.其中，土壤Cd含量与土壤粉粒、高程呈正相关关系，与植被指数、距道路距离、距河流距离呈负相关关系.本文研究结果可为土壤Cd污染治理提供科学的参考依据.

• Abstract：Cadmium (Cd) concentration is affected by numerous natural factors and human activities. It is very important to identify Cd sources and their affecting factors for optimizing pollution control, policy formulation and industries layout. Cd concentration is quite different within Guangdong Province because of the complicated geographical and economic conditions. Based on the method of Cubist, an optimal model was developed to analyze the major factors affecting the soil Cd concentrations in Guangdong Province. The results show that soil pH and soil type are the most significant factors influencing the concentrations of Cd in this region, and there is a positive correlation between the soil Cd concentrations and soil pH. Cd concentrations are relatively lower in the region of Latosolic red earths, Latosols and Purplish soils, and are higher in the region of Fluvo-aquic soils, Red earths, Yellow earths, Paddy soils and Limestone soils. On the other hand, Cd concentrations are relatively higher in the region of soils which formed from Quaternary, Devonian, and Carboniferous. Moreover, NDVI, silt fractions of soil, annual mean temperature, elevation, distance from the road, and distance from the river are also important factors. Positive correlations were observed between soil Cd concentrations and silt fractions of soil and elevation, while the correlations between soil Cd concentrations and NDVI, distance from the road, and distance from the river are negative. Our conclusions are useful for cadmium control in contaminated soils.

• Key words：soil Cd concentration  affecting factors  model  Guangdong Province  Cubist

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