Department of Environmental Science and Engineering,Tsinghua University,Beijing 100084;
Department of Environmental Science and Engineering,Tsinghua University,Beijing 100084;
Institute of Hydrology,Wallingford,Oxfordshire,OX10 8BB,UK;
Institute of Hydrology,Wallingford,Oxfordshire,OX10 8BB,UK;
Institute of Hydrology,Wallingford,Oxfordshire,OX10 8BB,UK;
Center of Environmental Sciences,Peking University,Beijing 100871,China;
critical load; acid deposition; soil sensitivity;