Abstract: The studies show that the light intensity and leaf temperature in tea tree crown decrease gradually from peripheral to central, from top to underneath and from south side to north side. The difference of air humidity in various positions of crown is smaller, and the wind speed on windward side is greater than lee side. New shouts in south and west crown sides sprout and grow earlier than those in north and east crown sides. The number of flower buds in north and east crown sides are less than that in south and west crown sides. The amino acid contents in new shoots increase slightly from south and west to north and east crown sides, and the contents of tea polyphenol and caffeine in south and west crown sides are more than those in north and east crown sides.

Key words: Tea tree, Crown, Microclimate, Phenological phase, Biochemical composition, BP neural network model, multivariate linear regression model, TDR-300, moisture content of forest surface soil, Quad-pol SAR, microwave remote sensing