Study On Stew Flow Characteristics And Water Consumption Of In Walnut Teeees Of Southern Xinjiang Under Drip Irrigation

Located in the hinterland of China's northwest Xinjiang, it is typical of arid and semi-arid climate, the region's perennial drought. However, Xinjiang region is the main area of our country agricultural country, planting patterns in the region for more extensive planting pattern, agricultural water use ratio is low, in response to national policy, Xinjiang region to promote water-saving irrigation mode is imperative.This test red flag slope farm in southern Xinjiang Aksu area of Xinjiang agricultural university experimental base in the trees as the research object. Experimental design four treatments, respectively15 mm drip irrigation quota(C1), drip irrigation quota 30mm(C2), drip irrigation quota 45mm(C3) and irrigation quota 30 mm bubble irrigation(C4). Experiment with German Ecomatik company produces the SF-G flow sensors to monitor trees trunk stem flow, Watchdog small weather station to monitor weather data, TRIME-IPH soil moisture meter measuring moisture content of soil, Growth cone(MORA SWEDEN)measuring trunk sapwood area. Analysis of experimental data obtained the following conclusions:(1) Average daily sap flow velocity variation Walnut tree growth period is increased by a little, and then reduced by a big process. Typical weather changes daily process, Sunny conditions shows bimodal curve, cloudy and rainy conditions multimodal curve and stem the flow rate is low. Stem flow rate and solar radiation, there is a good correlation between air temperature and atmospheric humidity, the regression equation: f=-0.8995+0.0003PAR+0.0382T+0.0044 RH, The correlation coefficient of 0.97.(2) The stem flow rate variation and soil moisture layer close relationship, analysis of the average moisture content of soil layer and stem the flow rate relations, the establishment of a regression equation:f=-0.049+0.013?, at 0.01 level(bilateral) on significant correlation. Soil moisture content in the soil layer depth of 0-20 cm and 0-40 cm greatest impact on the sap flow velocity.(3) Under different irrigation quota treatment conditions, stem flow rate value is the size of the relationship: C2>C3>C1;under different irrigation treatment, drip irrigation way stem flow rate is higher than animals. Stem flow rate calculated Walnut tree transpiration rate(Tr) has a good relationship with the reference crop evapotranspiration rate(ET0) between.(4) Under different irrigation quota process, C1, C2, C3 and C4 deal with the total water consumption were: 319.96mm?509.41mm?392.81 mm ? 479.58mm;Stone hardening stage and oil conversion period of the total water volume accounts for over 60% of the whole growth period water consumption,It is a critical period walnut drip of water, should be strictly controlled irrigation. Under four different irrigation treatments, C1, C2, C3 and C4 processing production was 2273.4 kg/hm2, 3169.9kg/hm2, 2574.7kg/hm2 aand 2139.8kg/hm2, C2 was the highest.(5) Stem flow rate change six or seven years of the Walnut tree, from the point of view the whole growth period, 2015 stem the flow rate is higher than in 2014, this is because at this stage of the Walnut tree belongs to a strong period between annual growth continued to grow.