Study On Crop Water Consumption Of Typical Crops In Mu Us Sandland Based On Hydrus-1D Model

Mu Us Sandland is located in the northwest semi-arid areas,agriculture is an important industry in the local,water resources is the most critical environmental factors.In the study area,the rainfall is less and the rainfall can not meet the growth needs of the crops.Therefore,some local irrigation is needed.The irrigation method is flood irrigation,the water use efficiency is low,and the water resources are wasted.Therefore,the water consumption of the local crops Leakage of the local rational use of water resources have a certain guiding significance.In this paper,the water consumption of spring maize and potato was simulated by field experiment in the field,and the Hydrus-1D model was used to calculate the water consumption of spring maize and potato.The results showed that the two crops Water use efficiency.The spring maize was determined by 2015 to keep the parameters unchanged,with the 2016 moisture content validation model determined that the model could be applied to local field trials on the 2016 spring maize soil moisture content change,water consumption composition,bottom exchange The dynamic change of the quantity and the water use efficiency under different irrigation conditions were analyzed and studied.In the study of spring maize,the potato was also simulated in 2016,the water flux in the potato growth period was estimated,and the sensitivity of the meteorological factors was analyzed.By Hydrus-1D simulation found:Through the 2016 simulation analysis we can see:2016 corn water consumption is the main source of rainfall,followed by irrigation.The water consumption of A,B,C,D and E was 395.18mm,376.84mm,374.02mm,345.60mm and 344.66mm respectively in the whole growth period.Among them,A,B,C,D,E treatment in the corn growth period down the 189.78mm,153.62mm,123.67mm,105.18mm,112.28mm water,deep leakage is often occurred in the rain and irrigation within a short time to complete,A large number of deep leakage is invalid farmland consumption,should take appropriate measures to reduce the amount of leakage.The yield of spring maize was between 10164.54 and 12999.74 kg·hm^-2,and the water use efficiency was between 2.95 and 3.45 kg·m^-3.According to the results of different irrigation treatments and water use efficiency,it is found that the higher the amount of irrigation,the higher the yield and water use efficiency of maize is not necessarily higher,and the rational development of irrigation system is very important for agricultural development.In 2016,the evapotranspiration of potato was 182.63mm,the rainfall and irrigation amount was 517.5mm during the growth period,the leakage rate was255.21mm during the growth period,the increase of water storage capacity was79.26mm and the equilibrium difference was 0.4mm.The yield of potato was32486.11 kg·hm^-2 in 2016 and the water use efficiency was 17.79 kg·m^-3.The sensitivity of water consumption to meteorological information is net radiation>daily maximum temperature>humidity>wind speed>daily minimum temperature.