Reserach On Planting Substance Of Modular Vertical Greening In Yichang & Ecological Effect Of Modular Vertical Greening

The development of society and the speeding up of urbanization lead to the building energy consumption and environmental pollution is increasingly serious, which make the landscaping area getting less and less, and the ecological environment is getting worse.Vertical greening is becoming an important form of greening because of its various advantages. However, there is little research on vertical greening substrate in our country.This study carried out the following research via modular vertical greening in Yichang.(1)Orthogonal experiment was carried out to explore a variety of physical and chemical properties, water retention, fertilizer conservation, plant fix performance and plant suitable performance with loam, ceramsite, peat soil, water retention agents and jute fiber as the material. Which provide a theoretical basis to vertical greening substrate formulated.(2)The ecological effects of vertical greening was partly explored via the plant wall, which provide a useful reference for the promotion of practical application of vertical greening work in a wide range. The primary results obtained are as follows:1)If only selected light volumetric weight, the optimum formulation combination is A3B3C123D123. If only selected higher total porosity, the optimum formulation combination is A3B1C123D123(A: ceramic, 1——10, 2——20, 3——30; B: turfy soil, 1——10, 2——20,3——30; C: water retaining agent 1——0.1, 2——0.2, 3——0.3. D: jute fiber, 1——0.3,2——0.6, 3——0.9. All of the above are mass ratio, and the quality of the dry loam is calculated as the base of the calculation. The same below). The p H level of these substrates were proper of most plants. If only selected higher organic matters content, the optimum formulation combination is A1B3C3D2. More water retention can be mixed into substrates to increase water retention capacity, and the optimal ratio in this experiment is A1B3C3D1.From the point of view of consideration of better nitrogen, phosphorus and potassium maintaining capacity, the optimal ratio is A2B3C3D2, A1B1C1D2 and A2B3C3D3. Screening from the substrate forming time, the optimal combination of formula is A1B2C1D3. The growth of Sedum hispanicum on Z6(the ratio of loam: ceramisite: peat soil: water retaining agent: jute fiber = 100: 20: 30: 0.2: 0.3)was the best, and which on CK(the ratio of loam:ceramisite: peat soil = 100: 30: 30 : 0 : 0) was the worst. The growth of Sedum sarmentosum Bunge on Z6 is the best, and which on Z9(the ratio of loam:ceramisite: peat soil: water retaining agent: jute fiber = 100: 20: 30: 0.2: 0.3) is the worst.2)It was showed that the content of ceramsite had highly significant negative correlation with p H and cumulative leaching phosphorus, and it had significant negative correlation with substrate forming time. The content of peat soil highly significant negative correlation with volumetric weight, significantly negative correlate with total porosity, and significantly positive correlate with organic matters content. Water retention agents content had highly significant negative correlation with water loss rate in 10 days, cumulative leaching nitrogen and potassium. Jute fiber had highly significant negative correlation with substrate forming time. Besides, this 4 kinds of materials did not reach significant levels with various other substrates performance.3)Through AHP comprehensive evaluation, it was found that Z3(the ratio of loam:ceramisite: peat soil: water retaining agent: jute fiber = 100: 10: 30: 0.3: 0.9) can be used as the substrate of vertical greening with Sedum hispanicum and Sedum sarmentosum Bunge.4)The cooling effect of vertical greening cooling manifested as ground temperature >wall temperature > canopy temperature > substrate surface temperature. The bacteriostatic rate of vertical greening was 89.38%. The conglutiantion of dust is markedly: Sedum hispanicum was in an average of 1.76g/m~2?10d, Sedum sarmentosum Bunge was in an average of 4.91g/m~2?10d. The pollution abatement is effective: Sedum hispanicum can absorb of sulfur dioxide gas for 0.23 g/m~2 and chlorine for 0.3 g/m~2,Sedum sarmentosum Bunge can absorb of sulfur dioxide gas for 0.08 g/m~2 and chlorine for0.13 g/m~2.