广州市土壤-大气界面Hg交换通量研究

摘要

The mercury fluxes between soil-air interfaces in 5 lawns of Guangzhou City were monitored by using a dynamic flux chamber coupled with a Tekran 2537A Ambient Mercury Vapor Analyzer. The average value of the mercury fluxes between soil-air interfaces in 5 monitoring points was 7.341±9.714 ng·m-2 ·h-1 . The effects of environmental factors on the mercury fluxes were examined. The soil mercury concentration affected the releasing capability of Hg in soils. The mercury exchange fluxes showed significant positive correla-tions with total solar radiation intensity and soil temperature and significant negative correlations with the pH values. It was also found that the rainfall and vegetation significantly affected the mercury fluxes.%运用Tekran 2537 A与动力学通量箱联测技术，对广州市5个绿化带和草地土壤-大气界面汞交换通量进行了实地监测，结果表明，广州市5个监测点土壤-大气界面汞交换通量密度均值为7．341±9．714 ng·m-2·h-1，不同地点土壤-大气汞交换通量密度有显著差异。汞交换通量密度随土壤汞含量的增加而增大，气象条件显著影响汞交换通量，汞交换通量密度与光照和土壤温度呈显著正相关关系，与土壤pH呈负相关关系，降雨和植被显著影响汞交换通量。