Critical load of sulfur deposition for ecosystemand its application in China

Current situation of air pollution of China is introduced. Critical loads for 4 types of soil in sensitiveareas of China have been calculated using methods of SSMB, Profile Medel and Magic Medel. Maps of criticalload , sulfur deposition of 1 990 and exceedance of sulfur deposition over critical load have been made. A casestudy of applying critical load map for abating acidification has ben made for Guizhou Province with respect tofour control scenarios. The result showed that evently emission reduction in whole province is not necessary,if critical loads are taken into consideration. Instead, reducing emissions from three big cities or moving LPSfrom sensitive areas to non-sensitive areas could also meet the requirement of environmental protection.