The Influence Of Plants On Particulate Matter Based On Simulation Experiment

For the further research on the influence of vegetation on PM, this research uses the method of simulation experiment, select 21 plant species, detect the variation of TSP, PM10, PM2.5, PM1 mass concentrations by DustMate. In order to find out how plants affect particulate matter mass concentrations, this research of simulation experiment use two box, one with plant, the other is blank, observe the difference of PM mass concentration between the two boxes. The results show as follows:1. Variation of particulate matter captured by twenty-one plant species is basically consistent with the time, are increasing rapidly at first, then gradually slowed down, and finally leveled off and stabilized. Bungeana (Pinus bungeana) has shortest saturated absorption time to PM10 and PM2.5, respectively,18 hours and 22 hours. Cedar (Cedrus deodara) has shortest saturated absorption time to PM1 which is about 36 hours or so. Euonymus (Buxus megistophylla) has longest saturated absorption time to PM10, PM2.5 and PM1, which are 36 hours,45 hours and 64 hours, respectively.2 PM adsorption capacity was significantly different between the twenty-one plant species. Comparison of 21 vegetation on the adsorption capacity of PM10, PM2.5, PM1,Syringa reticulata have the strongest PM10 adsorption capacity.which can adsorb 1.976 μg PM10 per square centimeter, the strongest adsorption capacity of PM2.5 and PM1 is belong to Cedrus deodara, which adsorption capacity for PM2.5 and PM1 are 0.887 μg 和 0.669μg per square centimeter. The worst adsorption capacity of PM10, PM2.5, and PM1 is Buxus megistophylla, the adsorption capacity was 0.318 μg、0.165 μg and 0.053μg per square centimeter.3 The PM is mainly adsorbed in the leaf surface and wax coat.54.9%-63.7% particle matter is adsorbed on the leaf surface. We use the density of the particles to represent the capacity of absorbing the particles, for large particles (diameter of 10-100 μm), Syringa reticulata had the highest accumulation capacity (1.997 μg·cm2), Buxus sinica had the lowest PM accumulation (0.425 μg-cm2). For coarse particles (2.5-10 μm), Syringa reticulata adsorb 1.225 μg per square centimeter, which is 5 times of Buxus sinica. For the particle which size is 0.2-2.5 μm, there is no significant different between twenty-one plant species on PM accumulation capacity. Koelreuteria paniculata and Pinus bungeana had the highest PM accumulation (0.854 μg·cm2 and 0.850 μg·cm-2). The particle density of the leaf surface is close to that of the wax layer.