岚皋县岩石、土壤和农产品中硒分布规律研究

Distribution Characteristics of Selenium in Rocks,Soils and Agricultural Products of Langao

【目的】探讨岚皋县岩石、土壤和农产品硒含量分布特征及其相互关系,揭示岚皋县岩石、土壤和农产品硒的分布规律。【方法】采集岚皋县岩石、土壤和农产品样本,测定样本中总硒含量。【结果】岚皋县岩石硒含量范围0.006~43.38 mg kg^(−1),均值4.15 mg kg^(−1),震旦系和寒武系地层岩石硒含量显著高于其他地层;土壤硒含量范围0.00007~33.4 mg kg^(−1),均值0.89 mg kg^(−1),76.08%的土壤面积达到富硒水平且表层土壤明显高于下层土壤;农产品硒含量范围0.0006~0.64mg kg^(−1),均值0.08 mg kg^(-1),其含量自大到小排列依次为其他植物(桑葚、香椿)、药用植物、水果及坚果、茶叶、粮食、魔芋和蔬菜。【结论】土壤硒对岩石硒的继承性良好,在相同硒含量水平的土壤上农产品硒含量按药用植物、水果及坚果、其他植物、粮食、茶叶、蔬菜和魔芋顺序依次下降,在富硒土壤生长的同一种类农产品硒含量均值高于生长于硒不足土壤上的该种农产品。

[Objective]The selenium contents in rocks,soils and agricultural products in Langao were discussed and their distribution characteristics and relationships were analyzed.[Method]Samples of rocks,soil and agricultural products in Langao were collected and the total selenium contents in the samples were determined.[Result]The results showed that the selenium contents in Langao rocks ranged from 0.006 to 43.38 mg kg^(−1),with an average of 4.15 mg kg^(−1).The selenium contents in Sinian and Cambrian strata were significantly higher than those in other strata.The selenium contents in soil ranged from 0.00007 to 33.4 mg kg^(−1),with an average of 0.89 mg kg^(−1).The percentage of soil enriching selenium was up to 76.08%,and selenium contents in surface soil was obviously higher than that in sub soil.The contents of selenium in crops ranged from 0.0006 to 0.64 mg kg^(−1),with an average of 0.08 mg kg^(−1).The order of selenium contents in crops from high to low was other plants(mulberry,toona sinensis),medicinal plants,fruits,tea,grain,konjac and vegetables in turn.[Conclusion]Selenium in soil showed good inheritance to rock selenium.The order of selenium contents in crops which planted on the same selenium content was from high to low for medicinal plants,fruits,other plants,grain,tea,vegetables and konjac.The average selenium content in crops grown in rich selenium soil was higher than that of in poor selenium soil.vegetables and konjac.The average selenium content in crops grown in rich selenium soil was higher than that of in poor selenium soil.