重金属对香蕉生长影响的试验研究

Research on The Effects of the Heavy Metals on the Banana Growth

对香蕉园土壤与灌溉水添加Cd、Hg、As、Pb、Cr、Cu重金属元素,研究该重金元素对香蕉生长影响,以及香蕉叶片对该重金元素的富集能力。结果表明:当重金属的浓度累集到一定值时,会对香蕉的生长发育产生抑制作用,浓度太高会造成香蕉的生长停滞甚至死亡。随着土壤中Pb、Cd、As、Hg、Cr、Cu重金属含量的增加,香蕉叶片中富集的重金属含量和富集系数表现为正相关的递增,香蕉叶片富集系数为Cr>Cd>Hg>As>Cu>Pb,重金属的添加量与香蕉叶片体内含量的相关系数(r)分别为0.9630～0.9994、0.9128～0.9983。

The Effect of heavy metal elements（ such as Cd, Hg, As , Pb, Cr, Cu） on banana growth and the collection capacity of heavy metal ions by the banana leaves were studied by adding them into the soil and irrigation water in the banana plantations. Results showed that banana growth and development may be inhibited by a certain concentration of the heavy metal elements and halted or killed by the excessive heavy metals in the banana plantations. With the increase of the heavy metal contents, the collection capacity and coefficient of heavy metal ions by the banana leaves increased positively correlated and progressively. The collection coefficients of different heavy metal ions by the banana leaves follow this order： Cr 〉 Cd 〉 Hg 〉 As 〉 Cu 〉 Pb. The correlation coefficients （r） of the additive amount of the haevy metal elements to the soil and the irrigation water in the banana plantations and the contents of them on the banana leaves were 0.9630-0.9994, 0.9128-0.9983 respectively.