膨润土对汞污染土壤及小白菜养分和汞含量的影响

摘要

The effects of different amounts of bentonite on the contents of nutrients and mercury in mercury contaminated soil and pakchoi were studied by pot experiment.The results showed that the amount of mercury pollution and bentonite had a different effect on nutrient and content of mercury in mercury contaminated soil and pakchoi,in low mercury pollution PG treatment,nitrogen content could be up to 38.63 mg/kg,the different achieved significantly level compared with blank experiment,in low mercury pollution PG treatment,phosphorus content reached 13.03 mg/kg,in the same mercury pollution by PG treatment,soil available potassium content had significant difference compared with the blank experiment,the difference between the range of 25.31-39.38 mg/kg.The nitrogen content in pakchoi was negative correlation with mercury pollution,and the amount of bentonite was correlation with potassium content in the pakchoi.When the amount of bentonite applied in the soil reached 40 g/kg,the soil mercury content reached the maximum,and the mercury content in pakchoi reached the minimum.%以汞污染土壤和小白菜为供试材料,利用盆栽试验研究不同汞污染处理下膨润土的不同添加量对汞污染土壤及小白菜中养分和汞含量的影响.结果表明,汞污染程度和膨润土的添加量对汞污染土壤及小白菜养分和汞含量产生不同影响,其中,污染土壤中,低汞污染PG处理时,碱解氮含量可高达到38.63 mg/kg,较对照差异明显;低汞污染下PG处理中有效磷含量值达到13.03 mg/kg;各汞污染下,PG处理土壤中有效钾含量较对照差异显著,差幅介于25.31～39.38 mg/kg;汞污染程度与小白菜氮含量呈负相关,而膨润土的添加量与小白菜钾含量呈正相关;当膨润土的添加量达到40 g/kg时,土壤中汞含量达到最大,小白菜中汞含量达到最小值.