【摘要】 [目的]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。[方法]以室内观赏植物绿萝作为受试对象,对南通市新城区20个居民小区共110家住户,进行入户调查与检测空气中甲醛污染状况;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。[结果]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20mg/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。[结论]该研究为稀土应用拓展及室内空气污染防治对策提供了新的思考方向。更多还原

【Abstract】 [Objective] This study was to analyze LaCl₃ sprayed onto Scindapsus aureus on Chlorophyll content and plasmamembrane permeability of leaves of Scindapsus aureus,in order to determinate a suitable dosage of LaCl₃.[Method] With Scindapsus aureus as the test subject,110 households of 20 communities in the New District of Nantong were selected to investigate formaldehyde concentration in indoor air;and effect of LaCl₃ on absorptive capacity to formaldehyde of Scindapsus aureus was studied through fumigating in laboratory.Simultaneously,its physiological and biochemical mechanism of formaldehyde resistance was studied.[Result] The results showed that formaldehyde pollution of indoor air was serious in the New District of Nantong,and the degree of pollution was related to the time after decoration.The suitable concentration of LaCl₃ for Scindapsus aureus was 20 mg/L.The ability to absorb formaldehyde of Scindapsus aureus,which was calculated by per unit leaf area,was enhanced after spraying the suitable concentration of LaCl₃ by 19.75%.When Scindapsus aureus was stressed by formaldehyde,chlorophyll content decreased by39.87%,membrane permeability and cumulative MDA amount increased by 8.17%and 56.92%,respectively,and POD activity increased by 11.32%.However,by comparing the group pre-sprayed with LaCl₃ and the group not sprayed with LaCl₃ under formaldehyde stress,chlorophyll content of Scindapsus aureus reduced lessly,membrane permeability and MDA both increased lessly,while POD activity increased more.[Conclusion] This study provides a new thinking direction for broadening of rare earth application and control measures of indoor air pollution.更多还原