Little is known about changes in mineral nutrients in forest ecosystems after a severe freezing hazard.Quantitative differences of nutrient content in tree,litterfall,soil and surface runoff before and after recent freezing disaster were investigated in a Koelreuteria paniculata and Elaeocarpus decipens mixed forest ecosystem in an abandoned manganic mining site in Xiangtan,Hunan Province.The results showed that after the freezing disaster,pH value,electrical conductivity,dissolved oxygen and concentrations of K,Ca,Mg significantly decreased,while the concentrations of Zn,Mn,Pb significantly i...