Research On Purification Efficiency And Response Mechanism Of Some Indoor Plants To Formaldehyde Pollution Stress

Formaldehyde is the main pollutant of indoor chemical pollution, and seriously endanger people’s health, which has been listed as the first invisible killer of indoor air pollution. Reduce indoor formaldehyde pollution by using characteristics of plants that plants can absorb and purify the indoor formaldehyde. The phytoremediation technology has become an important ways of the purification of formaldehyde pollution, and the technique of implementation dependent on the stably formaldehyde response mechanism in plant.This study was estimated by means of random blo block design with 3 replicates through method of variance analysis, multiple comparison, and study some houseplants’purification capacity and response mechanism to formaldehyde stress. The study take the fumigation treatment of experimental plants by simulated cabin fumigation, by measuring the changes of formaldehyde concentration in the cabin. The purification rate of formaldehyde and the amount of formaldehyde per unit area were calculated to determine the purification ability of plant to formaldehyde, and the physiological and biochemical response mechanism was analyzed. The study results show that:1. Study on the purification ability of indoor plants under formaldehyde pollution stress(1) The effects of formaldehyde concentration and plant species and their synergistic effect of formaldehyde concentration and plant species on formaldehyde removal amount per unit area and the purification rate reach a significant level. And the effect of formaldehyde concentration is more significant.(2) At formaldehyde concentrations of lmg/m3,2mg/m3,3mg/m3 were measured, the plant purification rate of formaldehyde is reducing while the formaldehyde concentration is increasing. Among them, Chlorophytum comosum (X5) at the time of the formaldehyde concentration of lmg/m3 and 3mg/m3 can achieve the highest purification rate, Scindapsus aureum achieve the highest purification rate at the formaldehyde concentration of 2mg/m3.(3) At formaldehyde concentrations of 1mg/m3,2mg/m3,3mg/m3 were measured, formaldehyde purification capacity of unit area of plants increases with the increase of concentration of formaldehyde, and at three experimental concentrations of formaldehyde, formaldehyde purification capacity of unit area of Chlorophytum comosum are the highest.(4) Integrated the membership function value analysis of indoor plant formaldehyde purification rate and purification capacity of unit area under different formaldehyde density condition, the best integrated purification plant species is Chlorophytum comosum(X5).2. Study on response mechanism of indoor plants to formaldehyde pollution(1) Effects of formaldehyde concentration, plant species, and their interaction on the rate of change in the content of chlorophyll, the activity rate of change of peroxidase (POD), the rate of change in the activity of ascorbate peroxidase (APX), superoxide anion production rate change rate, prop dialdehyde (MDA), the rate of change, the rate of change of soluble sugar content, pH rate of change, the impact of the rate of change of soluble protein content reached a significant level.(2) Indoor plants under different concentrations of formaldehyde pollution stress have different physiological and biochemical response characteristics, chlorophyll content of indoor plants decreased, peroxidase (POD) activity and ascorbate peroxidase (APX) activity, superoxide anion generation rate, malondialdehyde (MDA) content, soluble sugar content and soluble protein content increased.The change of the content of the biological molecules in plants increases or decreases the pH value of the plants.(3) Under the different concentrations of formaldehyde pollution stress, Kalanchoe blossfeldiana (X7)has the strongest resistant ability to formaldehyde pollution and the smallest response to formaldehyde pollution, and the Radermachera sinica (X1) are opposite.(4) The correlation among chlorophyll content, POD activity, APX activity, MDA content, superoxide anion produced rate, soluble sugar content and soluble protein content of indoor plants is large, the correlation between pH and other physiological and biochemical changes is small.