| Under the background of xinjiang to develop the characteristic of horticulture.The shortage of water resources seriously restricts the development of southern xinjiang horticulture in arid areas. Change the way of irrigation is particularly urgent. This paper based on the state forestry administration public welfare forestry industry special scientific research projects(project number: 201304701-2). Gray jujube as the research object in adolescent period. Using surface drip irrigation technology and the new developed well type irrigation technology to test it in southern xinjiang sand loam texture environment, test taking advanced ECH2 O soil moisture in the process of detecting instrument for dynamic monitoring and data collection. Design different drop head flow 4 L·h-1、8 L·h-1、12 L·h-1;irrigation duration 4h、6h;irrigation water24L、48L; initial moisture content 15.62%, 18.228%;well tube height 10cm、20cm、30cm as factors,to make a preliminary study of the regular pattern of soil water infiltration. Main research wet body horizontal vertical wetting radius, moist soil moisture content change value distribution and wet body and distribution changes after irrigation. And combined with the previous survey of local young period of Chinese jujube root conclusion, preliminary selected conforms to the southern xinjiang irrigation design parameters of sandy loam texture, use the test program for daily average net photosynthetic rate of six physiological periods in a year of young jujube. Verify the superiority of well irrigation water-saving and does not affect crop physiology. Provide certain theoretical basis for promoting well type irrigation. The main test conclusion:(1) Drop head flow, irrigation duration, total irrigation water affect wet experience of drop irrigation and Well type irrigation. Under the same head drops flow, with the increase of irrigation duration, namely the increase of irrigation amount, horizontal vertical of wetting radius is increasing, and drop head vertical moisture content change values will also continue to increase. Under the same irrigation duration, drop head flow rate, the greater the vertical and horizontal wetting radius migration of curve slope is greater. Affected by the deep clay, horizontal direction are longer than vertical migration of duration.(2)Soil wetting front transport rate under the condition of drip irrigation is influenced by the initial moisture content, Wetting radius increases with the increase of initial moisture content. Horizontal wetting radius and vertical wetting radius Zt under different initial moisture content can be expressed with a power function relationship with time relation.(3) Well tube height will affect the well irrigation soil moist body of distribution. 20 cm level underground well tube height on the influence of wetting radius is not very big, but the vertical depth radius in the process of soil moisture migration have a significant impact.It can be concluded that the well tube height is higher, the deeper the depth of the soil moisture change of moisture content value, below the surface the origin for the moisture content of 5 cm depth changes in value, the smaller the impact.(4)Two kinds of irrigation methods after stop water 12 redistribution of soil moisture content are maximum, then into the descending phase. Combining with the study of young period of Chinese jujube root system in the area of distribution, find that cover the young Chinese jujube absorption root system distribution range of design parameters. The results showed that drip irrigation flow rate to drop to 12 L·h-1, irrigation duration for 6 h, the total irrigation water for 72 L,well type irrigation adopt that drop head flow of 12 L·h-1, irrigation duration for 5 h, the total irrigation water of 60 L reasonable design parameters. And physiological period of a year on average net photosynthetic rate does not show much difference, indicated the well type irrigation water quality. |
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