Elements Of Chengdu Economic Zone Near-surface Atmospheric Dust Distribution Characteristics

The air dust near the ground is a mixture of atmosphere particulates and surface dust of the ground. Since the air dust near the ground has tremendous influence on the ecosystem environment and the human health, it's very important for us to study its chemistry composition, chemistry property and distribution situation for management and plan of the rural environment.The thesis mainly discusses space distribution character of 20 kinds of element of the air dust near the ground in Chengdu economic area. Built on district difference of the area, the distribution character of elements of the air dust near the ground in different physiognomy cells, districts and their city zones is researched. According to the result, how the distributing characteristic of the dust in the area is formated is clarified. Moreover, based on factor analysis method, the pollution of the air dust near the ground is evaluated by popular poisonous and harmful elements in six districts and their city zones of Chengdu economic area.The results of the research are as follows:1. The pollution in plain of the economic area is more serious than that in mountain and upland. In three physiognomy units, the pollution in city and town is more serious than that in country. The pollution in city is diffusing to country.2. The following scale of decreasing pollution in six districts was found: Deyang > Leshan > Chengdu > Ya'an > Meishan > Mianyang The same sequence of six cities is found :Deyang > Chengdu > Ya'an > Meishan > Leshan > Mianyang in six city of Chengdu economic area.3. According to the analysis of the distribution character of elements of the air dust near the ground, Hg is different from other heavy metal elements and Hg in mountain and upland is higher than that in plain. Though the pilot study, author considers that the exceptional phenomenon is related to the characteristic of Hg and the weather and geologic facors in Chengdu economic area.Through the research of element distribution of air dust in Chengdu economic area, it provides a scientific base for us to improve the environment in economic area, control the full development of industrialization in the rural areas and make economic sustainable development plans in the cities.