Simulation Of Water Transport In Jujube Trees In Arid Area Of Southern Xinjiang

This study uses the soil moisture content to verify the accuracy of jujube growth simulation based on WOFOST model,and optimizes the model parameters,simulation of crop transpiration and evaporation.Jujube precision irrigation scheme is analyzed and validated by using 2017 experimental data.The results of the study can not only provide guidance for the localization of the WOFOST model,but also play a role in improving the current situation of local water shortages.In this paper,WOFOST model is employed to simulate and verify the simulation results under five irrigation treatments in 2017,and the yield of the experimental area in 2017 and 2018 is compared.The main conclusions are as follows:(1)Local adaptive adjustment for model parametersThe 2017 agrometeorological observation data are collected by the automatic observation weather station near the research area.The WOFOST model is calibrated according to the data processed by D1,and then verified with the data processed by D2-D5 to determine the value of the main parameters.The results show that the WOFOST model could well simulate the soil water content,transpiration,evaporation and yield of jujube under water-limited.(2)Effect of root depth on water transportThe depth of crop roots has an important effect on water absorption and utilization.Generally,the deeper roots are easier to absorb water,which is mainly determined by the law of water movement and change in soil and its related conditions.At the same time,the temperature and humidity of the soil environment can directly affect the yield and growth of jujube.Too little irrigation is not conducive to the growth of jujube and stable yield,and too much irrigation water resources that can not be fully used is not conducive to the conservation of water resources.Therefore,an appropriate soil-water environment can not only inhibit the vigorous nutrient growth of crops,but also promote the growth of crop roots.It is very important to understand the law of soil water movement during the growth and development of jujube.(3)Effect of irrigation amount on jujube growth and soil moisture.Under the same fertilization amount,the soil water content of jujube trees increases gradually with the increase of irrigation times.The main reason is that the soil evaporation and crop transpiration of jujube trees increase the demand for water in jujube trees during this period,and the irrigation amount shall be the largest.When the amount of irrigation increases,the soil water content increases accordingly.While the irrigation amount is low,the water in the root soil of the jujube is absorbed and transformed to reduce the function of the root.As the fruit matures,soil evaporation and crop transpiration decrease as irrigation increases.During maturity period,the demand for water in jujube trees gradually decreased,and the soil water content also gradually decreased.