Study On Dust Retention Ability Of Six Kinds Of Common Vertical Greening Plants

This experiment according to the application of the vertical greening, chooses six kinds of vertical greening plants, which are used in sichuan basin area,Mucuna sempervirens Hems1、 Hedera nepalensis var sinensis (Tobl.) Rehd、 Lonicera japonica Thunb, Rhododendron hybridum Hort.、Viburnum odoratissimum var. Awabuki、Loropetalum chinense rubrum Yieh robust seedlings as test materials. From 2013 to 2014, studied in ya’an, chengdu six kinds of common vertical greening plants of unit leaf area, plant and dust detentions of land area, analyses the macroscopic and microscopic factors may affect the ability of the plant dust. The main results were as follows:(1) per unit leaf area dust catching quantity of six kinds of common vertical greening plants of order:Loropetalum chinense rubrum Yieh>Lonicera japonica Thuub>Rhododendron hybridum Hort>Hedera nepalensis var sinensis (Tobl.) Rehd>Viburnum odoratissimum var. Awabuki>Mucuna sempervirens Hemsl. The maximum amount of dust absorption per unit leaf area of the order is essentially the same:Loropetalum chinense rubrum Yieh>Lonicera japonica Thunb>Rhododendron hybridum Hort.>Hedera nepalensis var sinensis (Tobl.) Rehd>Viburnum odoratissimum var. Awabuki>Mucuna sempervirens Hemsl. Individual dust catching quantity order:Loropetalum chinense rubrum Yieh>Viburnum odoratissimum var. Awabuki> Rhododendron hybridum Hort.>Lonicera japonica Thunb>Mucuna sempervirens Hems1>Hedera nepalensis var. sinensis (Tobl.) Rehd. Unit of land area dust catching quantity order:Loropetalum chinense rubrum Yieh>Lonicera japonica Thunb>Rhododendron hybridum Hort.>Viburnum odoratissimum var. Awabuki>Mucuna sempervirens Hemsl>Hedera nepalensis var sinensis (Tobl.) Rehd.(2) In the macro conditions influence on dust detentions plant, by studying the Loropetalum chinense rubrum Yieh dust detentions of blade and the horizontal Angle, the relationship between positive unit leaf area can be found dust is greater than the amount of the back, blade dust detentions and horizontal Angle increase reduced; Of six kinds of vertical greening plants from pollution at the same time, the amount of dust were analyzed, and the plant from pollution sources can be found with the increase of distance, the dust detention volume decline gradually, but the trend gradually slow; Rainfall amount of dust detention unit leaf area and plant has more complex influence relations, when the rain is bigger, trapped in the dust on the surface of the blade will be washed off, led to the decrease of the amount of dust; When the rain is small, reduces the air flow capacity, improve the blade shows that moisture, dust quantity will increase; When continuous without rainfall, blade surface dust amount will gradually increase, until you reach the maximum of environment.(3)Through to affect the six kinds of vertical greening plants per unit land area dust quantity influence factors analysis, under the condition of the same source of dust, leaf area per plant is the unit of land the size of the plant dust key, followed by the planting density of the plant, and the unit leaf area of the plant dust amount of dust detentions influence can be seen as a constant value.(4) Based on six kinds of vertical greening plant leaf surface structure and quantity of the relationship between dust detention, surface can be found by number and leaf surface blowhole MAO number influence on dust detention ability is limited, and dust detentions influence of porosity and MAO was structure characteristics; Leaf dust detentions table wax to a certain extent effect of the mass; Leaf surface microstructure on the order of the trapped air is:Fold and bumps> cavity> Trench structure> mesh> wax.(5) six kinds of vertical greening plants of different size dust retention ratio, retention ratio of PM2.5 is the largest Loropetalum chinense rubrum Yieh, reached number 75.36% of total surface particles, the second is Hedera nepalensis var sinensis (Tobl.) Rehd, reached 68.75%; the least of Lonicera japonica Thunb, only 39.76%; the number of PM2.5 and other PM2.5～10 Viburnum odoratissimum var. Awabuki、Mucuna sempervirens Hems1、Rhododendron hybridum Hort., retention of similar.