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利用系统发育和根系形态不同的大豆与小麦,采用盆栽试验,研究了不同添加量铬对两种作物生长及铬吸收和转运的影响,并对两种作物铬耐受能力进行比较。结果表明,当土壤铬含量大于287.9 mg/kg(添加量为250 mg/kg)时,大豆植株生长变慢,无豆荚产生,且后期易枯萎死亡;大豆根系铬含量和富集系数超过小麦,而转移系数随铬添加量增加而逐渐降低,说明大豆对土壤中铬胁迫的耐性低于小麦;小麦籽粒铬含量超过规定的临界值。在土壤铬含量小于287.9 mg/kg时,小麦根系铬浓度和富集系数高于大豆,小麦根系比大豆具有更强的铬吸收能力;大豆茎叶富集系数高于小麦。
Pot experiments were conducted to study the effects of different Cr addition levels on the growth and chromium uptake and transport of two crops. The tolerance of Cr and Cr to the two crops was compared. The results showed that when the chromium content in soil was more than 287.9 mg / kg (250 mg / kg), the growth of soybean plants was slowed down and no pods were produced, and the plants died easily in later stage. The chromium content and enrichment coefficient of soybean roots exceeded that of wheat, The transfer coefficient decreased with the increase of chromium addition, indicating that the tolerance of soybean to chromium stress in soil was lower than that of wheat. The grain chromium content in wheat exceeded the stipulated critical value. When chromium content in soil was less than 287.9 mg / kg, the root chromium concentration and enrichment coefficient of wheat were higher than that of soybean, and the root of wheat had stronger chromium absorption capacity than soybean; the enrichment coefficient of soybean stem and leaf was higher than that of wheat.