Study On The Characteristics Of Mico-Irrigation Soil Water Infiltration And Jujube Of Water-Consuming Law In Northern Shananxi Mountain

On the basis of inspection of theory and technology at home and abroad,with major national scientific and technological support projects"The technology research and demonstration of fruit characteristics of semi-arid mountainous Shaanxi comprehensive water-saving".Major study on the character of wetting front migration and water distribution under single emitter and two emitter drip irrigation,and study on the character of wetting front migration and water distribution under the root irrigation; Studied on water-consuming law,WUE and the effect of soil temperature.The main findings as follows:(1)Studied on the character of wetting front migration and water distribution under single emitter and two emitter drip irrigation at the conditions of undisturbed soil in northern Shaanxi.Come to a single emitter wetting front migration in line with the power function relationship;Extended over time,migration rate of infiltration wetting front decreases,and the vertical direction of the wetting front migration rate is greater than the level of the direction of wetting front migration rate;Moisture content gradually decrease with depth increase.Under pairs of emitter condition,the interface body of horizontal and vertical water infiltration rate is greater than the rate of emitter bottom migration at the same time;soil moisture content gradually lower with the distance of emitters increase;Emitter spacing is constant,soil moisture content gradually increase with the dripping flow rate and irrigation duration increase.Tested conclude that dripping quota 4L/h,which lasted for 10 hours of irrigation can basically satisfy the requirements of crop root distribution.(2)Studied on the character of wetting front migration and water distribution under the conditions of the root irrigation.Tests conclude that wet body shape of root irrigation similar to the oval.Root irrigation wetting front migration in line with relationship of the power function,the rate of wetting front and soil moisture gradually increase with the dripping flow rate and irrigation duration increase,and the upward wetting front and soil moisture content increases as the emitter flow rate increase;Included the relationgship that between moisture cotent and wet radius by calculation.It concluded that dripping flow 4L/h,which lasted for 5hours of irrigation can basically satisfy the requirements of crop root distribution.(3)Studied on the character of wetting front migration and water distribution.The 0-80cm soil layer of soil moisture has larger seasonal changes;The seasonal changes of soil moisture content reduced with the soil layer increased;Different levels of soil moisture content under different soil moisture conditions.(4)Studied on law of water-consuming and productivity of soil moisture Jujube fruit-growth stages consume the largest volume of water, the second of consumption in flowering fruit,a minimum water consumption in embryonic period.The consumption of water gradually increase with the irrigation quota and irrigation frequency increase; Obtained crop coefficient of jujube at different growth stages under the different of irrigation quota and irrigation frequency;water consumption and irrigation quota and irrigation frequency in line with the relationship of three function under different soil moisture conditions.The crop coefficient has becomed with the irrigation quota and irrigation frequency increased.(5)Analysis of the jujube tree of physiological and growth index in growing period. Enhancing the irrigation number of times makes leaf area index,flowering fruit setting rate and the length of jujube hanging increase;The stomatal has becomed with temperature;The leaf water potential in relation to water content,the leaf water potential in the morning and evening is high and at the noon is low under the same conditions;Straw mulch and plastic film mulching in advance to make jujube into flowering fruit setting.(6)The numeber of reasonable irrigation and irrigation quota in this year:The WUE of bare land,mulching and straw mulch is higher when the irrigation scheduling is 135.0m3/hm2, irrigation number of times is 5times and.irrigation quota is 675m3/hm2.(7)Studed on the law of ground temperature changes in the condition of different soil moisture and received the rule:The curve of soil temperature of 0-5cm soil layer and 5-15cm soil layer can intend to compose the cosine and the sine function;The soil temperature in jujube stages is greatly to minor as follows:Bloom fruit expands phase>Bloom bearing fruits phase>Germ stretches leaf scheduled time>Fruit maturity.The temperature of soil has changed with the time increased..The temperature of the soil layer of 5.0cm and 10.0cm has large changed under the straw stem is covered in soil,the temperature of the soil layer of 15.0cm,20.0cm and 25.0cm change trends are milder;The temperature of the soil layer of 5.0cm,10.0cm and 15.0cm has large changed under the film mulching,the change trend in the soil layer of 20.0cm and 25.0cm is comparatively mild;The temperatures of bare soil layer change trend similar to the temperatures of straw stem coverage,but it change extent is big than straw stem coverage.