seasonal trend
1.The seasonal changing trend of osmotic potential at turgor loss point( Ψ tlp ),of maximum osmotic potential at water saturation point ( Ψ sat ),and of relative content of apoplastic water ( AWC ) were the same:lower (absolute value) at the beginning of the growing season,and higher at the end of growing season.
7.Results: The incidence rate of measles in pre-vaccine period (713.08/100 000 , 1955~1965),vaccine application period (539.81/ 100 000 , 1966~1978),EPI period (55.56/ 100 000,1979~1985) and Standardized outpatient service period (10.20/ 100 000,1986~2005) showed a significant decline trend. Seasonal distribution of its incidence rate was significantly high in the late winter and early spring.

