(Table 1) Properties of topsoil samples obtained from several sites in northe...

Concentrations of water-soluble Al, Ca, Cu, Fe, K, Mg, Mn, Na and Zn in soil samples is expressed in mol/l.土壤样品中水溶性铝（Aluminum, Al）、钙（Calcium, Ca）、铜（Copper, Cu）、铁（Iron, Fe）、钾（Potassium, K）、镁（Magnesium, Mg）、锰（Manganese, Mn）、钠（Sodium, Na）及锌（Zinc, Zn）的浓度，以摩尔每升（mol/l）为单位进行表征。