PRECISION COMPARISON OF THE EROSION RATES DERIVED FROM ~(137)Cs MEASUREMENTS MODELS WITH PREDICTIONS BASED ON EMPIRICAL RELATIONSHIP A STUDY ON SOIL AND WATER LOSSES IN LARIX KAEMPFERI (LAMB.) CARR. PLANTATION Spatial variability of slope land soil solute transport parameters STUDIES ON THE LAW OF THE SOIL AND WATER LOSSES IN THE CULTURAL LAND OF CHINESE FIR