不同矿化度水源膜下滴灌棉田土壤水盐动态和作物生长模拟OACSTPCD

In order to build a dynamic distribution model of water and salt and cotton growth under drip irriga-tion in arid areas,based on the 2020-2021 field experiment,we conducted numerical simulation of soil water and salt distribution characteristics,crop growth process and material accumulation distribution under 1,2,3,4,5 and 6 g·L-1 treatments after calibration and verification of the SWAP model's soil,soil hydraulic function and crop growth modules.The results showed that:(1)The simulation accuracy of soil moisture content and soil salt content was better in 20～100 cm soil layer,but worse in 0～20 cm soil layer.The simulation effect of soil moisture content was better than that of soil salt content.With the increase of salinity of irrigation water source,the simulation error of soil water content and salt content decreases gradually.(2)The simulation effect of leaf area index of cotton un-der drip irrigation with different salinity water source was better(R2=90.72％,RMSE=0.35 cm2·cm-2,NRMSE=8.73％,IOA=0.98).(3)The simulation effect of cotton stem dry matter accumulation under drip irrigation with different salinity water source was good(R2=89.08％,RMSE=6.12 g,NRMSE=23.16％,IOA=0.96).The results show that SWAP model was able to simulate the dynamic distribution of water and salt and the growth process of cotton under drip irrigation with different salinity.