福建沿海土壤地球化学分类及基准值研究

RESEARCH OF GEOCHEMICAL CLASSIFICATION OF SOILS AND GEOCHEMICAL BASELINE IN COASTAL ZONE OF FUJIAN PROVINCE

利用多目标区域地球化学调查成果,探讨了福建沿海土壤地球化学分类的方法,提出了分类命名方案和诊断标准,将研究区土壤按SiO2含量划分为铁铝土、硅铝土、铝硅土、硅土4个大类,其中硅铝土又分为一般硅铝土、铁质硅铝土、钾质硅铝土、硫铁质硅铝土4个亚类,铝硅土分为一般铝硅土和钾质铝硅土2个亚类;提出了在各种统计量中,中值比较客观地反映元素含量背景,适合作为基准值;给出了研究区各类土壤的分布图和52种元素及pH的基准值,分析了其成因和农业利用情况。

Currently, none of the versions of soils grouping can exactly reflect the chemical composition in soils, so limitation in directing agricultural production and region land layout exists. While carrying out the geological project “Ecology Geochemistry for Survey in Coastal Development Zone of Fujian Province”, we have found that soil geochemical data got in the project can make a new contribution to soils taxonomy. The research area was is located in the east of Fujian Province, in the south section of the Zhejiang-Fujian coastal volcanic fault-downwarp belt. Acidic intrusive rock and volcanic rock have a wide distribution, which followed by the Quaternary and sedimentary rocks.By using the date of multi-purpose regional geochemical survey, this paper discusses the method of geochemical classification of soils and proposes a scheme of classification, nomenclature, and diagnostic criteria. Referring to agrology, multilevel system is adopted for geochemical soils classify. The system contains category, subcategory and sort and named by major elements. According to SiO 2 level, the soils in the coastal zone of the Fujian Province is divided into four major classes: Fe-Al soil, Si-Al soil, Al-Si soil and Si soil, of which Si-Al soil is further divided into four subclasses: ordinary Si-Al soil, potassic Si-Al soil, ferruginous Si-Al soil and pyritic Si-Al soil. Al-Si soil is further divided into ordinary Al-Si soil and potassic Si-Al soil.