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This paper, through field trials on the basis of the analysis of the domestic and foreign fruit trees, drip irrigation research status and problems of, for the study, a 11-year-old walnut tree in April 2010 - August Wensu County in Aksu Prefecture woody Agri forest under drip irrigation walnut variation of leaf water potential and its influencing factors, different irrigation quota treatment under the walnut tree leaf water potential and meteorological factors, physiological indicators, yield and quality of impact factors; preliminary get the following conclusions: (1) different months walnut leaf water potential change showed a variation decreases and then increases, manifested as the walnut leaf water potential is higher in the morning and evening, and midday leaf water potential minimum, average daily ranged -2.33bar ~-9.62bar; (2) the different growth stages of different walnut tree morning leaf water potential (ΨL) and soil water content (SWC) test conditions, in addition to pre-oil into a negative correlation, in fruit enlargement period, hardcore and grease into late were positively correlated. Overall, the walnut tree in the early morning leaf water potential and soil water content showed a positive correlation Serve age walnut tree roots, soil moisture decreased morning leaf water potential decreases, resulting in enough water potential gradient to ensure that the water supply of the tree itself; When the root zone moisture adequate, the tree itself, the water supply situation is better, the early morning leaf water potential is maintained at a higher value. Comprehensive analysis of different growth period of drip irrigation mature walnut tree morning leaf water potential and soil water content between the relationship between available for SWC = aψL b (a, b empirical parameters, see Table 3-1.) (3 ) analysis of the walnut tree leaf water potential date change with solar radiation, atmospheric temperature, atmospheric relative humidity and other major meteorological factor of relationship, show that the solar radiation, atmospheric temperature and leaf water potential was significantly negative related to the relationship; atmospheric relative humidity and leaf water potential was significant with a positive correlation relations; Path analysis showed that the water potential impact of walnut leaves the the largest atmospheric temperature, followed by atmospheric relative humidity, solar radiation; atmospheric relative humidity, solar radiation and atmospheric temperature direct path coefficients were less than asked by various factors connected to the path coefficients indicate that the direct effects of the three is less than the indirect impact. Ask atmospheric temperature by atmospheric relative humidity and solar radiation are switched path coefficient, relative atmospheric humidity and solar radiation are the main factors that cause changes in atmospheric temperature, solar radiation is a decisive factor. Establish a functional relationship between the drip mature walnut leaf water potential diurnal variation with meteorological factors ψL =-a bRH-cR (a, b, c is an empirical parameter can see 2) and (4) analysis of a walnut tree leaf water potential (ΨL ) and net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance degrees (Gs), leaf temperature (T1) of the diurnal variation. That walnut tree leaf water potential and net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductivity degrees (Gs), leaf temperature (T1) was a negative correlation between where transpiration rate, leaf temperature extremely significant with negative correlation, and net photosynthetic rate, stomatal conductance significantly negatively correlated; Path analysis results show that the impact of walnut leaves water potential biggest is stomatal conductance, followed by transpiration rate, leaf temperature, net photosynthetic rate; transpiration rate and leaf temperature walnut tree leaf water potential impact is negative effect of walnut leaf water potential, net photosynthetic rate and stomatal conductance positive effect; analysis in irrigation treatments T2 conditions, as the dependent variable leaf water potential, net photosynthetic rate, transpiration rate, stomatal conductance, leaf temperature independent variables, using multiple linear regression analysis to establish a regression equation: ψl = a-the BPN-CTR DGS-ETL (a, b, c, d, and e is an empirical parameter, see Equation 3) (5) Analysis of the mature changes in leaf water potential (ΨL) the variation of the diurnal variation of the walnut tree sap flow rate (F) Day two was a good negative correlation and regression between the drip mature walnut sap flow rate and leaf water potential equation ψL = a-bF (a, b is an empirical parameter may see 4) (6) to determine the irrigation before soil volumetric water content range and scope of the walnut leaf water potential.
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