Effects of Afforestation on Abandoned Cropland on Soil Nitrogen Mineralization Carbon and nitrogen dynamics of decomposing foliar litter in a Chinese fir (Cunninghamia lanceolata) plantation exposed to simulated nitrogen deposition Temporal and spatial variation of soil nitrogen mineralization in northern slope of Changbai Mountain in Northeast China ATMOSPHERIC NITROGEN DEPOSITION AND NITROGEN DYNAMICS OF FOREST ECOSYSTEMS Litter Mass and Nitrogen Dynamics of Cryptocarya concinna Community in the Dinghu-shan Biosphere Reserve