关键词: 大气干湿沉降, 输入通量, 重金属元素, 有机氯农药, 江汉平原 

Abstract:

The atmospheric dry/wet deposition samples are collected from different environmental function districts in order to analyze particulate and dissolved indexes of heavy metals and organochlorine pesticides (OCPs) respectively. Furthermore, seasonal deposition flux and annual deposition total are calculated and applied to the case study, based on acquiring the seasonal change rules, the contribution of different geomorphic condition, cities and pollution source areas to deposition sources are compared. The results indicate as follows: atmosphere transports the heavy metals into Jianghan Plain by means of precipitation mainly.With respect to the atmospheric deposition amount, the plain’s is a little higher than that of hilly area and hilly land plain area,and Wuhan’s is higher than that of other cities, as well as industrial pollution areas,which amounts are much higher than the agrarian areas’.Taking three pollution source areas for comparison, the results are as follows:as particulate deposition of heavy metals, smoke dust> chemical industry dust > transportation dust;as dissolved deposition of heavy metals, chemical industry dust > transportation dust> smoke dust (expect for individual elements).The nutrient elements in atmospheric precipitation, such as N, K and Fe, are enriched relatively in chemical industry area.However, it is to a certain degree that P deposition is restrained in smoke dust and chemical industry area. Finally, the lindane still joins the local environment recently, which is concluded according to the different component relations of isomer between two different kinds of OCPs.

Key words: atmospheric dry/wet deposition, input flux, heavy metal elements, OCPs, Jianghan Plain