关键词: 野生植物, 甲醛气体, 净化能力, 耐受性

Abstract:

Five wild plants of Cangshan Mountain in Dali were evaluated for their effectiveness in purifying formaldehyde with 1, 2
and 3 mg/m3 concentrations in a simulated indoor formaldehyde polluted decoration environment, and the absorption capacities as the
evaluation index were compared and ranked based on the absorption rate per leaf area after 24 h formaldehyde treatment. Meanwhile,
the chlorophyll content and other physiological and biochemistry index were measured to assess those plants' physiological responses to
formaldehyde stress. The primary conclusions are as follows:（1）The results showed that the capacities of different plants in purifying
formaldehyde were different, and under the concentration of three kinds of formaldehyde treatment, the Cremanthodium delavayi and
Bergenia purpurascens were better than Reineckia carnea, Murdannia nudiflora and Roscoea cautleoides for their purifying capacities.
（2）The tolerance of different species to formaldehyde stress were different. According to formaldehyde purifying capacity and the
tolerance measured in the experiment, Cremanthodium delavayi and Bergenia purpurascens had both higher purifying capacities and
higher tolerance.（3）Wild plants have a great potential in purifying formaldehyde gas.

Key words: wild plants, formaldehyde gas, purifying capacity, tolerance