Canopy interception and its dissipation of winter wheat

A wiping method was adopted to measure canopy interceptions in different growth period of winter wheat. The results showed that the minimum canopy interception of winter wheat was 1mm and appeared the period from heading to flowering, i.e., the period with maximum LAI. The canopy interception rose with increased LAI in early growth of winter wheat and declined with decreased LAI in late growth of winter wheat. The dissipation of the canopy interception was affected by atmospheric temperature and humidity; the higher the temperature was and the lower the humidity was, the quicker the dissipation of the canopy was; contrarily, the lower the temperature was and the higher the humidity was, the slower the dissipation of the canopy interception was. The dissipation of the canopy interception was also affected by water on wheat plant; at the end of sprinkle irrigation, there was much water on wheat plants and thus the canopy inception more quickly dissipated; as the water on wheat plants decreased because of water evaporation, the canopy interception dissipated at a reduced speed.