贵州省丹寨县稻田土壤硒和锌含量调查

Investigation of Selenium and Zinc Contents in Paddy Soil in Danzhai County of Guizhou Province

[目的]弄清丹寨县各乡镇稻田土壤硒、锌含量及分布,以期为当地土壤硒锌资源开发利用提供科学依据。[方法]采集丹寨县6个乡镇主要稻田土壤样品,测定其硒、锌含量,分析其分布。[结果]该县稻田土壤耕作层硒含量在0.09~0.45 mg/kg,平均含量为0.25 mg/kg,其中足硒土壤占85.31%,少硒土壤占10.49%,缺硒土壤占4.20%,无高硒和过硒土壤;有效态锌含量在3.12~91.33 mg/kg,平均值为15.33 mg/kg,绝大多数稻田土有效态锌含量超过5.00 mg/kg。土壤耕底层硒含量在0.04~0.68 mg/kg,平均含量为0.27 mg/kg,其中足硒土壤占77.62%,少硒土壤占9.09%,缺硒土壤占4.09%,高硒土壤占8.39%,没有过硒土壤;有效态锌含量在3.00~65.21 mg/kg,平均值为11.15 mg/kg,绝大多数稻田土有效态锌含量超过5.00 mg/kg。[结论]丹寨县域稻田土壤多为足硒土壤,有少量的缺硒、少硒和高硒土壤分布,不存在过硒土壤;多数稻田土为很高锌稻田土,少数为高锌,没有低锌、少锌和缺锌稻田土。

[Objective]To find out the range and distribution of Se and Zn contents in paddy soils in the villages and towns of Danzhai County,and to provide scientific basis for the development and utilization of Se and Zn resources in the local soil.[Method]Samples were collected from the main paddy soils in six villages and towns of Danzhai County,the contents of total selenium,total zinc and available zinc were determined and their distribution was analyzed.[Result]The results showed that the content of Se in the cultivated layer of paddy soil in Danzhai County of Guizhou Province ranged from 0.09-0.45 mg/kg,and the average content was 0.25 mg/kg,of which 85.31%was full-Se soil,10.49%was low-Se soil,4.20%was low-Se soil,and no high-Se or over-Se soil.The available zinc content was 3.12-91.33 mg/kg,the average was 15.33 mg/kg,and the available zinc content was over 5.00 mg/kg in most paddy soils.The content of Se in the bottom of tillage soil ranged from 0.04 mg/kg to 0.68 mg/kg,and the average content was 0.27 mg/kg.Among them,Se-rich soil accounted for 77.62%,low selenium soil for 9.09%,Se-deficient soil for 4.09%,soil high in selenium for 8.39%.The available zinc content was 3.00-65.21 mg/kg,the average was 11.15 mg/kg,and the available zinc content was over 5.00 mg/kg in most paddy soils.[Conclusion]The results showed that the soil of paddy field in Danzhai County was full of Se,there were little Se-deficient soil,little Se-deficient soil and high Se-rich soil,and there was no excess Se soil,no low-zinc,low-zinc and zinc-deficient paddy soil.