土壤Hg胁迫对烤烟叶片矿质元素含量及其相关性的影响

Effect of Mercury Stress in Soil on the Contents and Correlation of Mineral Elements of Flue-cured Tobacco Leaves

采用盆栽试验,设置0、10、30、50、100 mg/kg 5个Hg含量梯度,研究了土壤Hg胁迫对烤烟叶片矿质元素含量及其相关性的影响。结果表明,土壤Hg胁迫下烤烟叶片8种矿质元素含量动态变化不尽相同,K、P、Ca、Mg含量总体随着生育期的推进逐渐降低;B、Fe含量总体随着生育期的推进先下降后增加,以烤烟移栽后30 d最高,B含量在烤烟移栽后45 d最低,Fe含量在烤烟移栽后60 d最低;Cu、Zn含量总体随着生育期的推进呈降低—增加—降低趋势,两者均在移栽后30 d最高、45 d最低。烤烟中部叶Hg含量随着土壤Hg含量的增加逐渐升高,总体上烟叶中的8种矿质元素含量均随Hg含量的增加逐渐降低。Hg胁迫下烤烟叶片K、Mg、Fe 3种矿质元素含量存在极显著相关性。

Differences of mineral elements content in flue-cured tobacco leaves under the stress of heavy metal mercury（ Hg） were studied by the outdoor pot experiment in which five mercury concentrations（ 0,10,30,50,100 mg / kg） were set. The results showed that the content dynamic changes of eight kinds of mineral elements in flue-cured tobacco leaves under Hg stress were not the same. With the development of growth period of tobacco,the contents of K,P,Ca and Mg in leaves gradually decreased; the contents of B and Fe in leaves firstly decreased,then increased,and reached the highest at 30 d after transplanting; the content of B reduced to the minimum at 45 d after transplanting and the content of Fe reduced to the minimum at 60 d after transplanting; the contents of Cu and Zn first decreased,then increased,and decreased again,both reached the highest at 30 d after transplanting and reduced to the minimum at 45 d after transplanting. The Hg content in middle leaves of tobacco gradually increased as Hg concentration in soil increased. As a whole,the eight kinds of mineral elements in tobacco leaves decreased as Hg concentration increased. There existed very significant correlation among K,Mg and Fe contents in tobacco leavesunder Hg stress.