Abstract: Crop canopy temperature is the outcome of the interactions of crop’s g enetic characteristics and environmental conditions, which not only affects leaf functional period, transpiration rate, and photosynthetic capacity, but also af fects grain protein content and starch synthesis. Crop yield is strongly affecte d by the canopy temperature after flowering, especially at mid-late grain-fill in g stage. This paper reviewed the research advances on the effects of canopy temp erature on crop yield, related mechanisms, and the factors affecting canopy temp erature, and pointed out that to breed superior genotypes and to implement reasonable agronomic practices should be the effective ways for improving crop yields and reducing canopy temperature.

Key words: Karst region, De-farming and reafforestation, Soil fertility quality, Comprehensive evaluation