Abstract: The transmissivity of the deciduous trees in the upper canopy of tea-fruit tree or-forest complex garden is 2～15% higher than that of the evergreen trees, up to 30% especially in spring. The transmissivity had not remarkable effects on the tea yield, when it was kept more than 55%.The amount of scattered light under canopy at 12 am～2 pm is more than the 11ght saturation point 2.9 J. cm^-2· min^-1 of tea tree. The amount of scattered light in deciduous trees reaches to 65～80% of total radiation in spring, 45～60% in summer and autumn. The amount of reflected light of tea tree canopy occupies a small part of total radiation, about 5～8% in sunny days, wilhin annual range of 5～10%. The maximum range of daily change is at 10 am～3pm, which reaches to 0.2～ 0.4 J·cm^-2·min^-1 in summer and autumn. The transmission of tea tree canopy is 500～2000lux. The maximum range of daily change of transmission is 15～20% of total radiation at 4～5pm, and the amount of absorbed light is 80 ～85%.

Key words: Tea-fruit tree or-forest complex garden, Light radiation, Composition, water source, precipitation variation, stable isotope, Nitraria sibirica, desert habitat