Distribution Characteristics of Selenium Content in Soil and Crops of Ping'an District in Haidong City
To investigate the selenium content and enrichment characteristics of soil and crops in Ping'an District,Haidong City,Qinghai Province,soil samples from 152,0～50 cm depth and 1 161 plant samples were systematically collected and analyzed.The content of selenium in soil and crops was determined by hydride atom-ic fluorescence spectrometry.The results showed that the average surface selenium content in Ping'an District was 0.27 mg/kg,which was higher than the national and world average soil selenium content.75.36%of the areas was in the appropriate selenium state,and the soil selenium content of Sanhe Town was the highest,and that of ancient urban and rural areas was the lowest.In general,there was no significant difference in selenium content among 0～10 cm,10～20 cm,20～30 cm and 30～50 cm soil layers collected in each township,but the selenium content gradually decreased with the increase of soil depth.In several crops,the average selenium content in rape was the highest,reaching the standard of selenium enrichment,the average selenium content of wheat,corn,peas,oats and potatoes were up to the standard of selenium,highland barley and broad bean were up to the standard of selenium in Sanhe town,where the soil selenium content was higher.Comprehensive analy-sis showed that selenium content in soil was positively correlated with selenium content in seeds of corresponding crops.Rape,wheat and corn had higher selenium enrichment coefficient and good absorption capacity for seleni-um.Therefore,it is suitable to cultivate selenium-rich agricultural products in fields with corresponding seleni-um-rich levels.Peas,broad beans,oat and highland barley considered moderately selenium-rich crops,whereas potatoes exhibit the lowest enrichment coefficient and the highest variation coefficient.Hence,growing potatoes in areas with high selenium content is advisable.
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