杭嘉湖平原土壤中氟元素的空间分布特征

以杭嘉湖平原13个地区的耕层土壤(0～20cm)中氟元素为研究对象,利用地统计与GIS技术相结合的方法研究了该地区土壤中氟的空间分布特征.结果表明,全氟具有较高的空间相关性,说明受母质、地形、土壤类型等自然的结构性因素影响较大;水溶态氟、交换态氟具有中等的空间相关性,说明施肥、管理水平等随机因素引起的空间变异起很大作用.采用Kriging最优插值法得到了表层土壤氟含量的空间分布图,显示土壤氟元素的3种形态与土壤母质、pH值、有机质、土壤质地等含量关系密切;全氟含量集中在200～300mg/kg;水溶态氟含量集中在0.5～1.0mg/kg;交换态氟含量集中在2.0～4.0mg/kg.全氟、水溶态氟、交换态氟的空间分布均表现为中、东部比西部高.

Spatial distribution character of fluorine element in soils on Hang-Jia-Hu Plain

Using the fluorine element in the plough layer soil (0~20cm) of 13 areas of Hang-Jia-Hu Plain as studied object, the spacial distribution character of fluorine in soil of these areas was revealed, utilizing combined method of geostatistical and GIS technique. Total fluorine possessed strong spacial relativity, explaining relatively great influence by natural structural factors of parent material, topography and soil type, The water soluble fluorine and exchangeable fluorine possessed medium spacial relativity, explaining that the spacial variation induced by random factors such as fertilization, management level played very great role. Adopting the most excellent Kriging method the spacial distribution map of the surface soil fluorine content was obtained, finding close relationship of these 3 forms of soil fluorine element with soil parent material, pH value, organic matter and soil texture. The contents of all fluorine distributed mainly among 200~300mg/kg, the content of water soluble fluorine was mainly among 0.5~1.0mg/kg, and that of exchangeable mainly among 2.0~4.0mg/kg. The spacial distribution of these three fluorines was similar relatively, being all higher in central and eastern parts than that in western part.