Abstract:With the litterbag method,the decomposition of twigs of oak ( Quercus liaotungensis ),was investigated in five years consecutively.Changes of concentrations and the remaining percentage of five nutrient elements,Ca,Mg,Cu,Zn,Mn,were determined.It was found that changes of concentrations and remaining percentages differed within those five nutrient elements throughout the five year decomposition.Concentrations of all those five nutrients were found increasing at the beginning stage of twig decomposition.Ho...