Abstract: The relationship o[ nitrogen cycling in tussall-feeding cab plantation with feding intensity of tussah silk worms, soil fertility and period of cutting branches and leaves is revealed in this paper. It is shown that cocoon pnduction and Periodical cutting of branches and leaves are the main factors affecting the N balance in tussah-feeding oak plantation. The intensity of feeding tussah silk worms and the pened of cutting branches and leaves must be defined in accordance with the fertility level of soil and tile growth intensity of tree. Regulating the compoLsition of ground vegetation by planting N-fixing speCies can obviously improve soil N condition.Application of N-fertilizers is an effective measure to enhance the nurse oak tree growth and to reinvigorate the growlh of deteriorated oak trees with old root system.

Key words: Tussah-feeding oak plantation, Disturbed ecosystems, Nitrogen cycling and regulations, soil moisture, water sources., artificial sand-fixation region, hydrogen and oxygen stable isotopes, precipitation events