福建省武平县富硒土壤特征及成因分析

Characteristics and genesis of selenium-rich soil in Wuping area, Fujian Province

基于福建省武平县农业地质调查取得的土壤元素含量数据资料,研究了土壤硒含量分布特征及其控制影响因素。结果表明,研究区土壤硒含量平均值为0.25×10^(-6),硒高值区主要分布在调查区的南东部,且较为集中连片,高值区硒含量平均值为0.42×10^(-6),达到富硒标准;土壤硒含量主要受控于地质背景,石炭系、二叠系碳酸盐地层及含煤地层硒含量较高,其风化形成的土壤硒含量也较高,是富硒土壤的主要分布区;不同成土母质区土壤硒含量不同,其中海相沉积岩区土壤硒平均值最高,达到0.34×10^(-6),火山碎屑岩区、花岗岩区、变质岩区土壤硒平均值较相近,分别为0.25×10^(-6)、0.24×10^(-6)、0.23×10^(-6);不同土地利用方式对土壤硒含量有一定的影响,茶园(0.57×10^(-6))、果园(0.40×10^(-6))土壤硒含量高于水田(0.25×10^(-6))土壤;土壤理化性质对硒含量有重要影响,表现为土壤硒含量与土壤pH值、有机质和铁氧化物之间具显著相关关系。

Based on the data of soil element content obtained from agricultural geological survey in Wuping County, Fujian Province, the authors studied the distribution characteristics of soil selenium content and its controlling factors. According to the result obtained, the average value of selenium content in the study area is 0.25×10^(-6), the high value area of soil selenium is mainly distributed in the south and east of the investigation area, and the average value of selenium content is 0.42×10^(-6), reaching the standard of selenium enrichment;the selenium content of the soil in the study area is mainly controlled by the geological background, and the content of selenium in the Carboniferous and Permiancarbonate strata and coal-bearing strata is relatively high The average selenium content of marine sedimentary rock area is the highest, reaching 0.34×10^(-6). The average values of selenium content in pyroclastic rock, granite area and metamorphic rock area are similar, being 0.25×10^(-6) and 0.24×10^(-6), respectively. Soil selenium content in tea garden(0.57×10^(-6)) and orchard(0.40×10^(-6)) is higher than that in paddy field(0.25×10^(-6)). Soil physical and chemical properties have an important impact on selenium content, which shows that soil selenium content has significant correlation with soil pH, organic matter and iron oxide.