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通过静态水培试验探讨了水浮莲(Pistia stratiotes L.)对55mg/L和155 mg/L锰(Mn)污染水体的净化作用。结果表明,各个处理的水浮莲鲜重、干重以及相对生长率表现出相同的变化趋势,从大到小依次为55 mg/L Mn处理、对照处理、155 mg/L Mn处理。155 mg/LMn处理的水浮莲叶片的叶绿素含量显著低于对照与55 mg/L Mn处理。水体Mn质量浓度随着取样时间的延长而降低,21 d时55 mg/L和155 mg/L处理的Mn去除率分别为31.44%和18.53%。与之相反,水浮莲的Mn质量比随着取样时间的延长而升高,收获时55mg/LMn处理的根和茎叶中Mn质量比分别为7 090 mg/kg和6 130 ng/kg,而155 mg/L Mn处理的根和茎叶中Mn质量比分别为12 320 mg/kg和12430 mg/kg。55 mg/L和155 mg/L Mn处理的水浮莲茎叶与根的Ca、Mg含量总体上随着处理时间的增加呈降低趋势。研究表明,水浮莲在净化Mn污染水体方面有很好的应用前景。
Purification of water contaminated with 55 mg / L and 155 mg / L manganese (Mn) by Pistia stratiotes L. was studied by static hydroponic experiments. The results showed that the fresh weight, dry weight and relative growth rate showed the same trend in each treatment, and were 55 mg / L Mn, control and 155 mg / L Mn in descending order. Chlorophyll content of 155 mg / LMn treated leaves was significantly lower than that of the control and 55 mg / L Mn treatment. The mass concentration of Mn in water decreased with the increase of sampling time. The removal rates of Mn at 55 mg / L and 155 mg / L at 21 d were 31.44% and 18.53%, respectively. On the contrary, the Mn mass ratio of Honeysuckle increased with the increase of sampling time. The mass ratios of Mn in roots and stems and leaves treated with 55 mg / LMn at harvest were 7090 mg / kg and 6 130 ng / kg, respectively, While the Mn mass ratios in roots and stems treated with 155 mg / L Mn were 12 320 mg / kg and 12430 mg / kg, respectively. The contents of Ca and Mg in leaves, stems and leaves of Siberian water drip bud treated with 55 mg / L and 155 mg / L Mn decreased with the increase of treatment time. Studies have shown that water lettuce in the purification of Mn contaminated water has a good application prospects.