生物炭施用对镉污染土壤中烤烟品质和镉含量的影响

摘要

A pot experiment was conducted to study the growth of tobacco,quality and accumulation of Cd in tobacco leaves on Cd contaminated tobacco soil by adding different concentration biochar as the soil amendment. The results showed that adding biochar could promote the growth of tobacco in some sort,and the effect will be more significant with more biochar. Biochar application increased the contents of total sugar,N and K in tobacco leaves, however,it decreased the content of Cl. The content of nicotine in tobacco leaves increased firstly then decreased with the increase of biochar application rate in Cd1 soil,however,it had an increasing trend in Cd5 soil. The accumu-lation of Cd in tobacco leaves was decline by the application of biochar. Application 5 g/kg biochar on Cd1 and Cd5 soil decreased the Cd contents in leaves by 4. 40% and 6. 46%,respectively;Application 20 g/kg biochar on Cd1 and Cd5 soil decreased the Cd contents in leaves by 58. 47% and 41. 22%,respectively.%通过盆栽试验,以生物炭作为镉污染植烟土壤改良剂,研究不同生物炭用量对镉污染植烟土壤上烤烟生长、烟叶品质及镉积累的影响。结果表明：添加生物炭对烤烟生长有一定的促进作用,且随着添加量的增加效果更显著。生物炭施用增加镉污染土壤烤烟叶片总糖、N和K含量,降低Cl的含量；随生物炭施用量的增加,Cd1污染土壤中烤烟叶片烟碱含量先增加后降低,而Cd5污染土壤中烤烟叶片烟碱含量逐渐增加。生物炭施用能有效降低烟叶中镉含量,5 g/kg生物炭使Cd1和Cd5污染土壤中烤烟叶片镉含量分别降低4.40%和6.46%；20 g/kg生物炭使Cd1和Cd5污染土壤中烤烟叶片镉含量分别降低58.47%和41.22%,均达显著水平。