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[目的]揭示海南西部地区土壤-水稻系统的铅含量分布特征,阐明土壤铅含量空间分布的影响因素和水稻铅含量生态风险。[方法]以海南西部为研究区,采用野外调查和室内分析相结合的方法,借助于地统计学和空间分析技术,综合研究区内土壤-水稻系统的铅含量分布特征。[结果]海南西部土壤铅含量为43.6 mg/kg,不同母质发育土壤的铅含量存在差异,区内土壤铅含量分布受母质分布的影响,而与土壤性质的关系不紧密。水稻精米铅含量低于秸秆,含量均值分别为0.14和3.48mg/kg,且水稻精米铅含量与土壤性质关系不紧密。[结论]海南西部地区土壤铅含量总体偏低,水稻精米铅含量低于我国食品安全国家标准中规定的稻米铅含量限量,区内的铅污染生态风险较低。
[Objective] The research aimed to reveal the distribution characteristics of lead in soil-rice system in western Hainan, clarify the influential factors of spatial distribution of lead in soil and ecological risk of lead in rice. [Method] With the western part of Hainan as the research area, the field survey and indoor analysis were combined to study the distribution characteristics of lead in the soil-rice system in the area by means of geostatistics and spatial analysis techniques. [Result] The content of lead in the soil of western Hainan was 43.6 mg / kg. There were differences in the lead content of soils derived from different parent materials. The distribution of lead in the soil was affected by the distribution of parent material, but not with the soil properties. The content of lead in rice polished rice was lower than that of straw, with the average contents of 0.14 and 3.48 mg / kg, respectively, and the relationship between the content of lead and the soil properties was not close. [Conclusion] The content of lead in the soil of western Hainan was generally low, and the content of lead in rice was lower than the limit of lead in rice stipulated in China’s national food safety standard. The ecological risk of lead pollution in the area was low.