| The atmospheric subsidence is in the atmospheric deposition descends the ground, it's divided into the dry atmospheric deposition and the wet atmospheric deposition. The action of gravity or the plant adsorption and so on descends to the ground the dry atmospheric deposition, the suspension descends along with the precipitation to the ground is the wet atmospheric deposition. Atmospheric deposition diameter in 10~100μm, when receives the washing out effect the diameter may be smaller than 10μm. Recent years, the people began to study and proceed to control soil "three changes", but also began to notice pasture, marsh and other ecological systems security. However, Many domestic and foreign research demonstrate atmospheric deposition is one of the important way for heavy metals and pollutants into the surface-ecosystems. Therefore research on atmospheric disposition has become a hotspot.Western Jilin province is the main agriculture and livestock production area in the whole province, the abundant pasture, marsh and lakes is the significant green screen in western region. Western area is located in transition zone of Semi-humid and semi-arid, the ecological environment in this area is frail. The changes of natural environment and anthropogenic activities is causally linked to serious soil desertification, salinization, degradation and more shrinking grassland, also the significant decline of the high quality forage. The increased atmospheric deposition of heavy metals and other pollutants in the ecosystem of the region, due to the small population, less developed industry, industrial and agricultural production activities into the grasslands, lakes, heavy metals and other pollutants in the ecosystem is short. In conclusion, the study on composite of atmospheric deposition and the influence on the distribution of the heavy metal in soil, forage, water not only have theoretical significance, but also has some actual value.This research is relied on the'Geochemical Evaluation of Pasture and Marsh in Western Jilin province', which is belonging to'Agriculture Geological Survey of Jilin Province'; this projection is implemented by the government of Jilin province and the Ministry of Land and Resources. Atmospheric deposition of Jilin province is the main object of study, through the research on correlativity between composition of atmospheric deposition samples, sources and the elements of soil, forage and water to conclude the impact of the surface environment, to provide a scientific basis for ecological security and policy. This article is collected the samples of atmospheric deposition, then analysis the character of the atmospheric deposition. Calculate the correlation of the elements in the atmospheric deposition through the factor analysis and enrichment coefficient method. Finally analysis the ground responds and edit the flux image. The figure shows the dry deposition plays a dominant role, and the average flux of Al, Ca, K, Fe, C, Na, Mg and N is larger than the others, Hg, Cd, As, Se, U, Th and Mo is lowest. The main source of the atmospheric deposition is the weathering of medium and basic rock and the trend of the flux is more higher from north-east to west-south.The clustering and correlative analysis is adopted to study the respond of the surface. The result indict the respond occurred in soil and forage which has high fluxes, on the contrary, soil don't have respond in which has low fluxes, but the forage has the respond. The Chagan lake and Yueliangpao lake have responds, both of them have large area. The contribution of toxic heavy metals such as Hg, Cd, As, et al. is low. Therefore, although the atmospheric deposition impact on the region which has high fluxes, it didn't destroy the ecology environment in western Jilin province. This research is important for future study, and valuable on evaluation of the ecological environment. The future work could focus on the suspended of water and the effective state elements of soil and grass. |
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