Abstract: Based on field sampling and laboratory analysis,the content,speciation distribution and availability of selenium in wheat field soils of Hebei were studied. The results showed that Firstly,the total selenium contents were between 0. 061－0. 584 mg /kg in wheat field soils of Hebei and the average value was 0. 341 mg /kg. Secondly,the available selenium contents were between 4. 93－83. 88 μg /kg and the average value was 31. 51 μg /kg.Thirdly,the selenium in wheat field soils existed mainly in the elemental,organic and sulfide bound forms,which accounted for 42. 25%－58. 46% of the total selenium,then in the residue form,which accounted for 28. 28% －40. 99%,and the ammounts of the other forms accounted for 12. 26%－17. 36%. But the soluble,exchangable and carbonate bound forms of selenium only accounted for 8. 12%－10. 37%,which they were available for plants.Forthly,the average availability of selenium was 9. 69% in wheat field soils of Hebei. There was significant positive correlation of the available selenium contents with the total selenium contents,organnic matter,pH and CEC in soils. So in agricultural production,we could increase the available selenium contents effectively by improving soil organic matter.

Key words: Wheat field soils, Selenium, Content, Speciation distribution, Availability

CLC Number: 

• S153