关键词: 花生;铅;镉;生物富集量;分配规律

Abstract:

Eight main cultivated peanut varieties in Qingdao City were used to study the absorption, accumulation and distribution rules of heavy mental Pb and Cd in different organs of peanut plants by using the same soil under field conditions. The results indicated that Pb and Cd contents, enrichment coefficient and bioaccumulation in experimental peanut seeds had significant differences. The Cd contents of these eight peanut varieties in kernel have surpassed the limitation standards made by the Ministry of Agriculture for pollution-free peanuts. The average accumulation factor of Pb and Cd in peanut plant organs are in the following order: root system>stem and leaf>shell>kernel. The Pb content absorbed by peanut plants was mainly enriched in stem and leaf, followed by shell, kernel and root system, while Cd was mainly enriched in the stem and leaf, followed by kernel, root system and shell. Through screening and directive breeding of peanut varieties with low Pb and Cd content, the Pb and Cd content in peanut benevolence will be reduced,  thus  the secure quality of peanut products will be improved.

Key words: peanut, lead, cadmium, bioaccumulation capacity, distribution rule