雷州半岛土壤地球化学基准值研究
Study on soil geochemical reference value in Leizhou Peninsula
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摘要: 基于珠江下游基本农田土地质量地球化学调查数据,对雷州半岛872件深层土壤样中的54项元素或指标含量进行分析,并与地壳、中国土壤C层元素和广东省土壤C层元素含量(12项指标)进行对比,讨论了不同成土母质类型的土壤地球化学基准值特征。雷州半岛深层土壤元素变异性较大,元素地球化学基准值整体不高,不同成土母质类型的土壤地球化学基准值差异明显。深层土壤元素继承了成土母质的地球化学特征,体现了区域地质背景与成土母质类型的多样性,以火山岩类风化物为成土母质的深层土壤富集铁族元素、分散元素,花岗岩类风化物富集造岩元素、钨钼族元素、放射性元素和稀有稀土元素。Abstract: Based on the geochemical survey data of basic farmland’s soil quality in the lower reaches of the Pearl River, the contents of 54 elements/indexes in 872 deep soil samples from Leizhou Peninsula were analyzed. Compared with crustal abundance, element content in layer C of the soil in China and element content in layer C of the soil in Guangdong Province (only 12 indexes), the characteristics of soil geochemical reference values of different soil parent materials were discussed. The concentrations of elements in deep soil in Leizhou Peninsula vary greatly with not high element geochemical reference values as a whole, and the soil geochemical reference values of different parent material types have obvious differences. The deep soil elements inherit the geochemical characteristics of the soil parent material and reflect the diversity of regional geological background and soil parent material types. The deep soil with volcanic rock weathering as the soil parent material is enriches with iron group elements and dispersed elements, while the granite-weathering soil is enriches with rock forming elements, tungsten molybdenum group elements, radioactive elements and rare earth elements.