Abstract
AbstractPlastic film mulching is an effective agronomic measure for increasing crop yield, and the decision support system for agricultural technology transfer (DSSAT) model is an effective tool for simulating crop growth and water management. However, the DSSAT model does not have a specific soil evaporation module for plastic film mulching. In this paper, a method for estimating soil evaporation capacity under film mulching conditions based on the small hole effect was developed and embedded in the DSSAT model. Then, considering the compensation effect of soil temperature on air temperature under the condition of film mulching, the DSSAT model was modified accordingly. The results show that the average temperature compensation coefficient for 2 yr from sowing to emergence was 0.695 °C, and 0.305 °C from emergence to jointing. The improved DSSAT model can simulate the growth of summer maize (Zea mays L.) and changes in soil water content. Compared with the original model, the average relative RMSE of the simulated and observed soil water content of the modified DSSAT model improved by 2.26 and 1.63%, respectively. The modified model can improve the simulation accuracy, which shows that the method proposed in this paper can provide an effective way for the simulation of crop growth process under film mulching conditions.
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