| Xinjiang is a typical arid region, serious lack of water resources, and waterresources are closely related to production and life in any activities in Xinjiang. Howto improve water use efficiency under without reducing economic developmentbecomes hot topic. In this paper, water-saving irrigation technologies emerging Traceirrigation techniques is chosen for the study, taking the area between Fukang oasis anddesert of Gurbantonggut as experimental area, study on parameters water migrationdistribution of trace irrigation technology in Xinjiang with different projects in differentsoil. Meanwhile aquasorb was combined with trace migration, study the distributionof irrigation water in combination with aquasorb conditions.The final approach to thecultivation test to verify the effect of trace amounts of water in different technicalengineering and soil parameters.Through investigate soil and vegetation of the test area to determine thedistribution parameters of soil and planting vegetation used in the experiment. Usehomemade bath water systems to observe the changes of moist body and waterdistribution in the soil. After obtaining the rules of moisture transport and distributionin different kind of soil, engineering parameters and different application methods ofaquasorb, combine the rules above with vegetation planting parameters such as density,height, ground and underground biomass. The main research work and results are asfollows:（1）Background investigation study areaExperimental located in Xinjiang University governance desert bases, Fukang,which is a typical desert landscape, flat terrain. Likewise there are differences in soilproperties change with depth, typical surface0-10cm,20-30cm layer of sand, hardtexture of compacted layers,30cm The following is a typical sandy loam. Layered soilcan be judged by the kind of places have decertified. In terms of vegetation, and theplot is located in the transition zone between the south edge of Gurbantonggut desert and Fukang Oasis, Chenopodiaceous vegetation dominated the overall vegetationcoverage is not high, around20%. Less vegetation types, mainly S. salsa, co-head ofgrass, reed grass, Ceratoides, harmala, Elymus and so on.（2）Distribution of water migration under different soil conditions and engineeringparameters1) With homemade water supply systems, irrigation head of soil depth and soilmoisture migration process and the impact on the distribution of water is observed.Theresult of tests showed that the soil moist mainly affect the size and shape of the body,the transition from clay to sandy soil, moist body exhibit reduced down to thehorizontal length and the vertical length increase. The depth factors also showed asignificant effect on the lower end of the length of the lower moist body length increasesrapidly with depth; For water distribution, soil and depth are not on them.2) water rate, by analyzing a variety of processing, are forming a water-saturatedarea around the center of a range of irrigation, the water in this area contains a smallerrate of change, and in addition to its range of moisture content was unilateral declinetrend, so moisture distribution can be divided into two relatively independentprocesses, the moisture diffusion process that is outside the area of water saturationprocess, with the saturation region after the formation of the saturated zone. Formoisture content distribution, moisture content outside the saturation region is afunction of the level of the proposed distribution shall be measured from the centerpoint of irrigation.（3）Distribution of moisture migration with aquasorb administered under differentconditionsObserving Trace irrigation water transport processes in Plexiglas vat, the resultsshow that under conditions of different methods of application and depth of the impacton water-saving irrigation aquasorb effect is different.1) Impose conditions under layers of different depths, retaining agent on the horizontal application layer, extended both play a role. But in the vertical direction,when administered after aquasorb5cm depth of water across the application layerupward migration played a disincentive to8cm in depth but then upward migration ofmoisture played a catalytic roll. Changes in moisture content, depth5cm8cm moisturerate of increase than the large amount of growth from irrigation center distance, thatmoisture around a positive correlation.；In the mixed fertilizer conditions, differentdepths, insurance agent were so moist body in different directions to get a strongextension of the application area, depth of less than25cm, can extend down to the wetbody at the near surface. In the horizontal distance, the magnitude of different depthswere extended to more than50%. For water distribution, water retention agent afterapplication, the application of the regional water rates have increased. On the side awayfrom the center1/3of the distance range, similar to the formation of water-saturatedzone without administering insurance agent, but the scope of the correspondingsaturated zone is less aquasorb administered a larger increase. The relative position ofthe measuring point in the moist body’s decision to change the moisture contentmeasurement points.2) a comprehensive analysis of the two methods of application, can be solved byfollowing mixed fertilizer aquasorb in moist body extended up to near the surface, thetop aquasorb play suppress evaporation efficacy storage conditions. Use mixedaquasorb underground irrigation irrigation heads above the soil, can be extended in avertical or horizontal direction moist body as needed, which can increase the depth ofwater under normal conditions of supply of crops, cultivation reached free demolitionpurposes. While achieving the suppression of soil surface evaporation by insuranceagent, to reduce evaporation of water purposes.（4）Planting trialsOverall, the vegetation index in addition to density changes over time is notobvious, the other indicators over time increases the growth of vegetation and growth 50-80days>20-50days. Different factors on the growth of vegetation increase withtime, insurance agent and depth of application methods and their interactions on variousindicators of vegetation significantly increased significantly, while the depth has asignificant effect on vegetation growth targets. For the indicators, A3B4is the best deal,that depth is25cm insurance agent is mixed fertilizer application methods, thevegetation grow best. After comparative analysis of underground biomass, can bedrawn under the control of the appropriate depth conditions, mixed aquasorb canpromote root growth of vegetation. |
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