STUDIES ON THE CONTROL THRESHOLD OF THE SILK TREE SCALE (AONIDIELLA SOTETSU (Takahashi)) A STUDY ON WATER BALANCE OF PROTECTIVE FOREST ECOSYSTEM IN LOESS AREA Soil and plant nutrient status of protective forests in western bank of Dongting Lake STUDIES ON RAISING THE EFFECT OF CASUARINA EQUISETIFOLIA AFFORESTATION ON THE SANDY LAND IN THE DRAUGHT IN THE COASTAL ZONE Geostrophic deviation analysis of regional effects of protective forest system in reducing windspeed in north Liaoning plain METEOROLOGICAL EFFECT OF GRAZING FOREST IN THE GRASSLAND EXPERIMENT STATION OF BAIYINTALA REGION A review of the present situation and future prospect of science of protective forest PROTECTIVE MATURITY OF PROTECTIVE PLANTATION AND DISTURBANCE Investigation on the structure of the protective forest belt in sandy area in Maowusu Shelter ing Effects of Farm land Protective Forest and The ir Rela tion shipsin Artif ic ia lOa sis of Ar id Reg ion ANALYSIS AND EVALUATION OF SOIL WATER CONDITIONS OF PROTECTIVE FOREST ECOSYSTEM IN LOESS AREA