The Leaf Anatomical Structure Characteristics Of Greening Plants And Its Response To Air Pollution

When greening plants improve the urban ecological environment quality, they were adapting the change of environment at the same time. The leaf anatomical morphology changes is the result of the plants adapt the environment, thus it can be an environmental indicator. The leaf anatomical properties of six greening plants such as Ligustrum lucidum, Pittosporum tobira, Photinia serrulata, Ligustrum quihoui,Euonymus japonicus, Prunus ceraifera cv. Pissardii. were researched and the relationship between anatomical properties and concentration of air pollutant were discussed. We expect to prove some basis for a further understanding of the adaptability of greening plants and some scientific guidance for choosing greening plants. The results are as follows:(1) Seasonal changes of leaf anatomical structures were basically the same trend. The leaf thickness had an upward trends in general;the cuticle thickness is more thicker in 4 and 10 months; There is a overall downward trend in the epidermal cells and ascend trend of palisade tissue thickness; spongy tissue rise first and then downward. The proportion of palisade tissue increased in leaves.(2) All greening plants have upper and lower cuticle,upper and lower epidermal and the thickness of upper cuticle and upper epidermal are larger than lower, mesophyll cell differentiation in two parts, the palisade tissue with small interspace and the spongy tissue with large interspace. Different plant leaf anatomical structure have significant differences, especially spongy tissue and the SR. There is a significant or highly significant correlation among the cuticle thickness, sponge tissue thickness, leaf thickness, it indicated that the leaf thickness are obviously influenced by the cuticle thickness and spongy tissue thickness.(3) The coefficient variation of Ligustrum lucidum, Ligustrum quihoui, Prunus ceraifera cv. Pissardii, Pittosporum tobira, Photinia serrulata and Euonymus japonicus were 13.9%、12.7%、10.8%、10.2%、9.2% and 9.8% in respectively. The plasticity index were those plants were 0.345, 0.298, 0.271, 0.255, 0.243 and 0.238 in respectively. The ability of environment adaptation of this greening trees was Ligustrum lucidum >Ligustrum quihoui >Prunus ceraifera cv. Pissardii>Pittosporum tobira>Photinia serrulata >Euonymus japonicus Of all structures palisade tissue, spongy tissue and the ratio of palisade tissue and spongy tissue have relatively high plasticity,it means that those organization played a dominant role in response to different environment.(4)The correlations of cuticle thickness of the city in plants were positive or extremely positive with CO concentration, and significantly negative or extremely negative with O3 concentration. The cuticle thickness of Ligustrum quihoui And Prunus ceraifera cv. Pissardii. Have significant correlation with PM10 concentration. The thickness of spongy tissue of the city in 4 plants and O3 were significantly positive correlation.