Study On Garden Afforestation Phenology And Its Optimal Application In Lanzhou City

Plant is the most important vital element in gardening design with significant importance. Species constitution,ornamental character,phenological character and current application of plants can determine its ornamental effects and style to a great extent which also influence the quality and level of urban greening. With development of society and economy, ecological city was widely accepted. That is the direction of city development to build ecological garden city with local culture. Base on some principles and methods of relevant disciplines, such as Landscape Architecture, Synecology, Landscape Aesthetics, etc., this paper research on species constitution and phenological characters of Lanzhou City, China, summarized the general characteristics of its plant design and put forward some representative models of plant configuration, which are suitable for different function requirements. It may also helpful for other cities in gardening design.1.Plant species constitutes for gardening in Lanzhou CityWith an investigation of 28 green area and 20 main avenues in Lanzhou City, Plant species constitutes and application frequencies were analyzed, main species of green plants and famous trees were investigated. The result indicated that there were 148 sorts of gardening plants which belong to 59 faculties and 99 categories applied in Lanzhou City with the representative faculties of Rosales,Leguminosae,Compositae, plant species which applied for gardening had a significant difference compared to middle or big cities within China. Arbores and shrubs dominate on species and quantities, followed by herbs gardening in vertical sections, liana and hydrophyte for tridimensional gardening were simply applied. 86 species were frequently used especially Sophora japonica Linn.,Juniperus formosana,Rosa chinensis with statistic of frequencies, 30 species were often used in avenue gardening with 5 representative arbors of Sophora japonica Linn.,Salix matsudana var. matsudana f. umbraculifera,Ailanthus altissima,FraxinusvelutinaTorrbie,21 sorts of famous trees, respectively.2. Phonological observations for main gardening plants in Lanzhou City 78 species of gardening plants were recorded for phonological observation.52 species were mainly focused on ornamental character which including leaf emergence stage,flowering stage,fruiting stage,leaf coloration stage,shedding stage.39 species of arbores which mostly flowering in April with red colours;9 species of fruit-ornamental plants with red fruit;3 species of color leaves plant and 14 autumn leaves ornamental plant; respectively. Phenophase combination analysis was made from leaf emergence to first flowering stage which indicate flowering and leaf emergence orders on plant varieties. Main flowering period of herb and green period of lawn were also identified in Lanzhou City.3. Research on gardening plants deployment in Lanzhou CityGardening plants deployment was analyzed for typical green land according to field investigation and principles for plants deployment, main problems were proposed for gardening plants deployment in Lanzhou City and suitable models were proposed for gardening plants deployment in Lanzhou City.