| This thesis studies the composition of planting species, function and distribution of green space in Xiaolan Town, Zhongshan City. The eco-system of Xiaolan green land is planned by applying relative theories of urban ecology and landscaping ecology.Xiaolan Town covers a large variety of garden plants including 105 families and 433 species. Public green land per capita is 5.02m2, and the coverage of greening 33.3%. In the urban area, there are 4 parks occupying 27.6 hm2, which are completely equipped with entertainment facilities and several plots of street green space of 4.35hm2. Street greening begins to take shape. The new urban areas are densely dotted with green trees, which consist of arbors, shrubs and grass. However, the street of the old urban area is narrow and its greenery is simply composed of single layer arbors. The new urban area, Jinju Garden, whose green land accounts for over 30% of the area, possesses central garden and courtyard green belt while the old urban area, Xinyong Road residential area, is densely populated and is crowded with houses with hardly any green land. Some green belts attached to units such as Today Group, Guli Corporation, Yongda Company, Xiaolan Middle School and the local government are well done with greening. Conversely, some schools and factories attach little importance to greening and even have no green land. The nursery in this town covering 8000 hm2 is one of the biggest bases for flower culturing in China, and seedlings are sold all over the country. In general, garden plants in Xiaolan town are abundant and varied, most of which are nursery and flower farmland. Varieties and richness of plants in parks are ranked the second. In contrast, there are much fewer street trees. Efflorescent arbors are widely cultivated in parks, having strongdecorating effects. In addition, flowering shrubberies and colorful shrubberies are also effectively planted in parks and streets. Nevertheless, perpendicular greening is seldom used, and species of lianas need to be further researched into.As far as the aesthetic function is concerned, People's Park and Longshan Park are rich in landscape types with great aesthetic effects.As for the environmental function, C02 concentration in parks is 304.6ppm. Air negative-ion concentration in waterfall in People's Park is 5760/cm3, which is the highest of the whole town. Air quality index (Ci) is 7.69 and the amount of bacteria 561/m3. The environmental air is the cleanest in parks, compared with other areas in the town.The concentration of C02in suburbs and nursery is 310.4ppm and 309.8ppm respectively, which is between that of parks and streets. In nursery, Ci is 0.52, which is between 0.5 and 0.69. The amount of bacteria is 603/m3and the environment air clean.The old urban area - Xingyong Road residential area is crowded with inhabitants and buildings, where the concentration of C02 reaches as high as 327.6ppm. Whereas, the new urban area - Jinju Garden is well planned with larger area of green land. The concentration of C02 is relatively lower, 306.7ppm, secondary to that in parks. In the case of Xingyong Road residential area, Ci is 0.29, and air quality arrives almost at the critical point of air pollution. Ci in Jinju Garden is 0.65, between 0.5 -0.69, and the amount of bacteria is 574/m3, next to that in parks. The environmental air is medium clean.The street in old urban areas is narrow with busy traffic with the concentration of C02 relatively higher, 323.1ppm, while the street in new urban areas is wide with light traffic so that C02 concentration is lower, only 312.0ppm. As far as concentration of air negative-ion and bacteria are concerned, there is no significant difference between new and old urban areas. On the average, air negative-ion is 224/cm3, the amount of bacteria 2453/m3 and Ci 0.17. Air is slightly polluted.At the bus station, the negative-ion is as low as 92/cm3 and Ci 0.03, which is below 0.09. The amount of bacteria is 2461/m3 and air is seriously polluted.On an average, in the urban a... |
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