抄録
A field experiment was conducted to determine the effects of polyethylene film mulch on air temperature and humidity. Transparent polyethylene film with a thickness of 0.05mm was used in this experiment. There were two experimental plots: one bare and one mulched. All of the soil surface in the mulched plot was covered with the film. Air temperature and relative humidity at four different heights, net radiation and soil heat flux were measured in each of the experimental plots on March 18th, 1997.
Air temperature over mulched ground was higher than that above bare ground in the daytime, because polyethylene film mulch increased sensible heat flux in the daytime. On the contrary, specific humidity over mulched ground was lower than that above bare ground in the daytime, because polyethylene film mulch intercepted evaporation from the soil surface.
