改良剂对土壤-烟草系统中Pb污染风险的削减

采用植烟区土壤的田间盆栽试验,研究了石灰、腐植酸、硫化钠、猪粪4 种改良剂对烟草中Pb 及其土壤中有效Pb 含量的影响。结果表明,不同改良剂处理下的烟叶中Pb 含量与土壤中Pb活性呈极显著正相关,4 种改良剂可明显抑制土壤中Pb 的活性,从而显著降低烟叶中Pb 积累量,削减率为23.16%~59.71%,且各处理与对照均达到显著性差异。综合考虑土壤-烟草系统中Pb 的削减效果与烟叶的经济性状,采用因子序列生成法排序,得出施用2.25 t·hm^-2的石灰、2.25 t·hm^-2的腐植酸或22.5 t·hm^-2的猪粪可有效削减土壤-烟草系统中Pb风险。

Decrease Risk of Pb Contamination in Soil-tobacco Systemby Amendments

Pot experiment using tobacco field soil was conducted to study the effect of four types amendments of lime, humic acid, sodium sulfide and organic manure on the content of Pb in tobacco and available Pb in soil. The results showed that the content of Pb in tobacco leaves treated with different amendments was proportional to the activity of Pb in the soil, and that the activity of Pb in the soil was obviously inhibited, thus significantly reduced the Pb accumulation in tobacco leaves, and the decrement rate ranged from 23.16% to 59.71%, with treatments and comparisons reaching significant difference. Based on the decrease effect of Pb in soil-tobacco system and the economic ben-efits of tobacco production, it was concluded that 2.25 t·hm^-2 of lime, 2.25 t·hm^-2 of humic acid or 22.5 t·hm^-2 of organic manure could effec-tively decrease the Pb risk in soil-tobacco system by factor sequence generation method.