浙西球川富硒区耕地土壤硒含量及其影响因素

Contents and Influence Factors of Selenium in Arable Land Soils of the Qiuchuan Selenium-rich Area,Western Zhejiang

通过浙西球川耕地土壤的调查与分析,对表层土壤硒分布特征及其影响因素进行了研究。结果表明,该区表层土壤硒含量均值为0.43 mg/kg。不同地层分布区土壤硒含量差异较大,荷塘组碳质页岩、硅质岩分布区土壤硒含量最高(平均值为0.59 mg/kg),寿昌组凝灰岩分布区土壤硒含量最低(平均值为0.32 mg/kg),地质背景(岩石分布)对土壤硒含量及分布起控制作用。旱地土壤硒含量平均值高于水田。土壤硒含量与有机质含量呈正相关关系,而与土壤p H关系不密切。球川地区土壤硒主要来自自然背景(成土母质),外源输入影响较小,该区富硒土壤具有可持续开发利用潜力。

Based on the investigation and analysis of arable land soils in the Qiuchuan selenium-rich area of the western Zhejiang province,the distribution of selenium contents in surface soils and its influencing factors were studied.The results showed that selenium contents in test soils had an average of 0.43 mg/kg and varied according to underlying strata of soils.The contents of selenium were relatively high with an average of 0.59 mg/kg in soils developed on carbonaceous shale of the Hetang formation and siliceous rock and were relatively low with an average of 0.32 mg/kg in soils developed on tuff of the Shouchang formation,indicating the controlling role of the geological background in the content and distribution of soil selenium.The average selenium content in dry land soils was higher than that in paddy soils.The soil selenium content showed a positive correlation with the organic matter content but no correlation with p H of soil.The natural source is the predominated source of soil selenium in the Qiuchuan area and the exogenous input is negligible.Therefore,the selenium-rich soils in the study area have sound prospect for sustainable development and utilization.