LaCl_3对绿萝净化甲醛能力及生理生化变化的研究

Effect of LaCl_3 on Capacity of Formaldehyhyde Absorption and Physiological/Biochemical Indicators of Scindapsus aureus

对南通市新城区20个居民小区共110家住户,进行入户调查并检测室内空气甲醛浓度;以室内观赏植物绿萝作为受试对象,分析喷施稀土LaCl3对绿萝叶片叶绿素含量和质膜透性的影响,进而确定绿萝喷施LaCl3的适宜剂量;采用熏蒸法考察LaCl3对甲醛胁迫下室内观赏植物绿萝降醛能力的影响,并研究其甲醛抗性的生理生化机制。研究结果表明,南通市新城区居室空气甲醛污染较为严重,污染程度与装修后时间长短有关;绿萝喷施LaCl3的适宜浓度为20 mg/L;在喷施适宜浓度LaCl3之后,室内观赏植物绿萝单位叶面积吸收甲醛能力有所增强,提升幅度为19.75%;甲醛胁迫下,绿萝叶绿素含量降低了39.87%,质膜透性和MDA累积量分别增加了8.17、56.92%,POD活性升高了11.32%;经LaCl3预处理后,较甲醛胁迫组,绿萝叶绿素含量降幅与质膜透性、MDA浓度增幅均变小,而POD活性增幅变大。

A survey of indoor air formaldehyde pollution was conducted in 110 households out of 20 communities in New District of Nantong City,during which Scindapsus aureus was selected as a test plant.Chlorophyll content and plasmamembrane permeability of Sc indapsus aureus were tested when it had been sprayed with LaCl3 in order to determine suitalble dosage of LaCl3.The capacity of formaldehyde absorption of Scindapsus aureus was tested through the method of fumigation at the laboratory;at the same time,its physiological and biochemical mechanisms of formaldehyde-resistance were investigated.The results suggested that in general the condition of indoor air formaldehyde pollution in Nantong was severe and the pollution was obviously related to the duration after home decoration;Scindapsus aureus’s ability to absorb formaldehyde by spraying LaCl3on its leaves was increased by 19.75%.On the other hand,when Scindapsus aureus stressed by formaldehyde its chlorophyll content decreased,but then membrane permeability,MDA（Malondialdehyde）and POD（peroxidase） activity increased.However,compared with the no-spraying group under formaldehyde stress,pre-spraying group showed decreases of Scindapsus aureus’s chlorophyll content,membrane pemeability and MDA but an increase of POD activity.