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利用红外测温仪对果树树冠遮阴引起的地表温度变化作了测量。２年的结果表明，裸地地表温度的降低值ΔＴ（℃）主要取决于树冠透光率τ和太阳的光合有效量子通量密度Ｕ０（μｍｏｌｍ－２ｓ－１），它们之间满足关系式：ΔＴ＝０．０１１３Ｕ０（１－τ）。
Infrared thermometer was used to measure the change of surface temperature caused by shade of fruit trees canopy. The results of 2 years show that the decrease of surface temperature ΔT (℃) in bare land mainly depends on the light transmittance τ of the canopy and the photosynthetic effective quantum flux density U0 (μmolm-2s-1) of the sun, which satisfies the relation: ΔT = 0.0113U0 (1-τ).