Photosynthetic Characteristics and Dust-holding Capacity of 12 Vertical Greening Plants in Guangzhou City
To screen vertical greening plants with strong photosynthetic characteristics and dust-holding capacity,12 kinds of vertical greening plants in Guangzhou were selected as the research objects.The photosyn-thetic and physiological parameters were determined by the Li-6800 portable photosynthetic system,and the dust-holding capacity was determined by elution weighing particle size analysis and microporous membrane filtration method.The results showed that the net photosynthetic rate(Pn)of Heptapleurum heptaphyllum was the high-est,the transpiration rate(Tr)of Loropetalum chinense and Chlorophytum comosum in the plot of the Mall of the World North District was lower,and the water consumption was lower and the resistance was stronger.The light compensation point(LCP)of all plants was close to shade except that of L.chinense and Cyclosorus in-terruptus.Aucuba japonica and C.comosum in the plot of the Mall of the World North District had the highest dust-holding capacity.Comparing C.comosum and H.heptaphyllum in the two sample sites,it was conclu-ded that there was a significant difference in the dust-holding capacity of the same plant in different habitats,and the that the amount of dust-holding capacity increased significantly with the increase of pollution degree.The TSP size of 12 kinds of vertical greening plants was as follows:A.japonica>C.comosum>H.heptaphyl-lum in the plot of the Mall of the World North District>Schefflera actinopylla>Cyclosorus interruptus>Epiprem-num aureum>H.heptaphyllum in the plot of the Gaode Land Plaza>Peperomia tetragona>Tradescantia zebrina>Nephrolepis cordifolia>Syngonium podophyllum>L.chinense>Asplenium nidus>C.comosum in the plot of the Gaode Land Plaza.Comparing the same plants contained in SQ and BS,the TSP,dry weight dust-holding a-mount,PM>10,PM10 and PM2.5 of C.comosum in the plot of the Mall of the World North District were 8.93,3.24,7.65 and 15.99 times that of C.comosum in the plot of the Gaode Land Plaza,respectively.The ratios of TSP,dry weight dust-holding,PM>10,PM10,and PM2.5 were 2.16,1.43,0.67,5.35 and 9.74 for H.heptaphyllum in the plot of the Mall of the World North District and H.heptaphyllum in the plot of the Gaode Land Plaza.In the construction of urban vertical greening,A.japonica,C.comosum,H.heptaphyllum,S.actinopylla can be chosen as the preferred plants.
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