三原—阎良地区土壤及农作物Se含量特征

Survey and Research of Selenium Content in Soil and Crops in Sanyuan-Yanliang

以三原—阎良地区土壤为对象,研究了三原—阎良地区土壤中Se元素、pH值和有机质的含量及其分布,以及土壤中Se的主要赋存形态,发现当地拥有大面积的富Se土地资源;土壤基本属碱性、强碱性,有利于植物对土壤Se的吸收利用;土壤中丰富的有机质有利于土壤Se的富集;Se主要以有机结合态形式存在,可提供大量可溶性有机和无机Se为植物利用。通过对调查区主要农作物的研究,发现区内油菜、小麦、大蒜、白萝卜、玉米、芹菜的富Se食品达标率高达55%以上;农作物对土壤Se的富集能力为:油菜>小麦>大蒜>玉米>白萝卜>白菜>花白>芹菜>花椰菜;区内大部分农作物达到食品卫生标准。因此,调查区具有发展"天然、绿色、安全"的富Se农作物得天独厚的优势。

Taking soil in Shanyuan-Yanliang as a research object, studing on selenium, pH value and organic matter content and distribution of local soil, and the main forms of selenium. The resuits show： There are plenty of selenium-rich soil; The soil is in favor of plant absorbing seleni- um in soil which is alkaline or strongly alkaline; Abundant organic matter is in favor of selenium enrichment in soil, Selenium exists mainly as organic combination state which can provide abundant soluble organic and inorganic selenium for plant absorbing. Through surveying the main crops in investigation area. The results show. Se-enriched food standard-reaching rate of rape, wheat, garlic, white radish and corn are more than 55 %. The average of selenium enrichment coefficient of nine crops are follows： rape〉wheat）garlic〉corn〉white radish〉Chinese cabbage〉 cabbage〉celery〉cauliflower. Most crops are up to food hygienic standard. Therefore, the survey area has unique advantages to developing ＂natural, green and safety＂ se-enriched crops.