Enzyme activities in snail, Oncomelania hupensis from river beach and its agro-forestry systems Comparison of total protein, amino acid and glycogen contents in snail, Oncomelania hupensis from river beach and its agro-forestry systems Material flux of agro-forestry systems on slope iu hilly regions of Sichuan basin N cycle of rubber-tea-chicken agro-forestry model in tropical area of China