Experimental Study On Soil Moisture Evaporation In Aeolian Sandy Land Of Northwest Liaoning Province

The precipitation is less and the seasonal distribution is not uniform in the north-west of Liaoning Province,the solar radiation is strong,the whole year is windy,the evaporation of soil water is a kind of ineffective loss of the atmospheric precipitation,and the evaporation of soil water in the aeolian sand field is an ineffective loss of atmospheric precipitation.Its size directly determines the amount of available water in the total precipitation and the growth and development of the sandy vegetation.In view of the phenomenon of low soil water use efficiency and serious loss of soil water evaporation,the study on soil water evaporation in the wind-blown sand field of northwest Liaoning Province is carried out,and the process of soil water evaporation in the wind-blown sand field of northwest Liaoning Province is deeply understood.Vegetation restoration and soil and water conservation in sandy land are of great significance.The main conclusions of this paper are as follows:(1)Under sand,stone and straw mulch,the cumulative evaporation of soil water of the same mulch in the whole evaporation process was as follows: control > 1cm > 2cm > 3 cm.3cm straw mulching decreased 52.90% at 25% moisture content,20.28% with 5% moisture content,and 46.33% with 15% 3cm sand and stone mulching with 15% moisture content,and the best evaporation inhibition effect under different mulching thickness was that of 3cm straw mulching was reduced by 52.90% under 25% moisture content,20.28% with 5% moisture content,Considering the accessibility of the mulch and the soil moisture status in the aeolian sandy land of northwest Liaoning Province,it can be concluded that covering 3cm sand and stone in the surface layer of the soil is the most suitable ground to reduce the evaporation of soil water.Cover mode.(2)Under the same thickness of mulch,the effect of sand and stone mulching on soil water evaporation was better than that of straw mulching under 5% and 15% moisture content,but under 25% moisture content,the effect of straw mulching on soil water evaporation was obviously better than that of sand-stone mulching.The thicker the cover thickness,the better the effect of inhibiting soil water evaporation.(3)The cumulative evaporation of P3 and P2 decreased by 9.60% and 1.49%,respectively,and the cumulative evaporation of W3 was 16.41% higher than that of W1 and W2,respectively,when the dosage of PAM and Watt water retaining agent was different,the cumulative evaporation of P3 and P2 were decreased by 9.60% and 1.49% respectively,and the cumulative evaporation of P3 and P2 were increased by 16.41% and 1.49%,respectively.17.09%.The cumulative evaporation of soil water increased with the increase of the amount of water retaining agent.(4)The evaporation water loss ratio of each treatment increased with the increase of temperature,and decreased with the increase of soil thickness when PAM was applied alone or mixed with PAM and water retaining agent.The ratio of evaporation to water loss was 6cm > 3cm > 9cm.(5)The soil water evaporation parameters under different mulching conditions and different water retention agents had better adaptability to the evaporation model.The results showed that the fitting effect of Rose model was better than that of Black model and Gardber model.