以纳米TiO2光催化处理水培过多茬生菜的营养液,研究了营养液中植物自毒物质、有效态Fe、Mn、Zn元素含量的变化,并以处理后的营养液水培生菜,研究了纳米TiO2光催化处理对水培生菜产量及品质的影响。结果表明:纳米TiO2光催化处理可有效去除营养液中的植物自毒物质|但降低有效态Fe、Mn、Zn元素含量,尤其是降低了有效Fe元素含量|以经过纳米TiO2光催化处理后的营养液培养的生菜单株鲜质量和总产量相比对照均显著提高|生菜叶片中叶绿素、Vc及可溶性糖含量均比对照有一定程度的提高,而总酚及类黄酮含量则显著低于对照。总之,纳米TiO2光催化处理可有效降低水培生菜营养液中的植物自毒物质,促进生菜的生长,在封闭式无土栽培系统中具有极大的应用前景。
The effect of nano-TiO2photocatalysis on removal of phytotoxic substances in reused nutrient solution and its effect on contents of effective Fe,Mn,Zn element in reused nutrient solution and thegrowth of hydroponic lettuce were studied. The results showed that nano-TiO2photocatalysis could effectively remove the phytotoxic sub-stances in nutrient solution,but decreased the contents of effective Fe,Mn,Zn element in nutrient solution,especial-ly for Fe;lettuce total yield and the average plant fresh weight were increasedgreatly compared to control;the chlo-rophyll,Vc and soluble sugar contents in lettuce leaf also had improved compared to control,but the total phenolic and flavonoid contents in lettuce leaf were lower than those of control. Nano-TiO2photocatalytsis could effectively re-duce the phyotoxic substances accumulated in nutrient solution and promote thegrowth of hydroponic lettuce. There-fore,it will havegreat application prospects in closed soilless culture system.
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