Litter amount and its dynamic change of four typical plant community under the fenced condition in desert steppe Evaluation of Wind Protection Effect of Oasis Shelterbelts in China A NEW STUDY ON ESTIMATING FOREST STOCK VOLUME USING SPACE REMOTE SENSING DATA Discuss in Stock Volume Index and Application of the Oasis Protection Forest System THE APPLICATION OF SPOT DATA IN RESEARCH OF FOREST FIRE BEHAVIOR AND ESTIMATION OF FOREST STOCK DAMAGE IN AMUER FOREST BUREAU THE ESTABLISHMENT OF BINOMIAL STOCK VOLUME TABLES OF POPLAR