Effect of different soil moisture treatments on soil temperature of plastic film mulched spring wheat

Effects of soil moisture under different treatments on the changes of soil temperature were analyzed according to the field experiment of plastic film mulched and non-mulched spring wheat. The results show that the difference of soil temperature among different soil moisture treatments is remarkable. Soil temperature under severe water deficit treatment is higher than that under other water deficit treatments in the whole growth stage of spring wheat, and the daily maximum temperature is 9.8℃ higher than that under the well-watering treatments on non-mulched field. And the daily maximum soil temperature under the well-watering treatment, the light water deficit treatment and the medium water deficit treatment on plastic film mulched wheat is 6.4℃, 4.6℃ and 1.7℃ higher than that under the well-watering treatments, respectively. Influenced by the different factors, there is a remarkable difference of soil temperature during the trefoil stage and filling stage, which the range of daily soil temperature varies from 2.1℃ to 11.4℃, and from 2.4℃ to 13.5℃, respectively. The variation of daily soil temperature decreases from the top (34.6－40.9℃) to 25cm depth (3.0－3.5℃). There is no significant difference under the light water deficit and the medium water deficit treatment on plastic film mulched wheat at the depth of 0－5cm from the top. There is extremly significant difference among other treatments. The research results provids a theory basis for regulating soil temperature of plastic film mulched spring wheat and establishing irrigation schedule.