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Experiment of Microclimate Regulation and Numerical Simulation Soil Water Dynamic of Root Zone for J

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Tutor: DongXinGuang JiangHuiFang MaYingJie
School: Xinjiang Agricultural University
Course: Hydrology and Water Resources
Keywords: Jujube,Micro-irrigation,Statistical analysis,Numerical Simulation,HYDRUS (2D/3D)
CLC: S665.1
Type: Master's thesis
Year:  2011
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Abstract:
Modern and efficient irrigation technology is a combination of irrigation drip irrigation, micro jet, Root Irrigation modern micro-irrigation equipment and agronomic measures, management style, it is to solve the problem of high energy consumption and low efficiency arid zone fruit fertilizer management major. However, how to determine the micro-irrigation water-saving technology, supporting agronomic measures for different fruit trees and irrigation system, the general experimental study analysis. In this thesis, relying on the arid area of ??the national scientific and technological support projects of modern agriculture water-saving technology integration and demonstration \tree water consumption regularity, proper irrigation system. By Steven Hydra system and tube TDR system continuously measured jujube tree root zone soil moisture; chlorophyll meter, vernier caliper observation the jujube physiological indicators; Vantage Pro2 weather station hourly monitoring of meteorological testing ground; drill with root, root scan analysis system survey analysis the jujube absorbent root distribution. And survey above chart comparison, statistical variance analysis, regression analysis method and analyzed using HYDRUS (2D/3D) under drip irrigation jujube root zone soil water dynamics and different irrigation system jujube consumption The water law of the simulation study. The main findings are as follows: (1) of the Zaoyuan the microclimate flowering Mist impact analysis of variance showed that, in the lower part of the canopy Mist can significantly compared with the control (P lt; 0.01) canopy humidity, increased fruit setting rate. Different flowering processing yield, quality variance analysis showed that the middle of the canopy Mist yield compared with the control, the upper Mist the lower Mist increased by 51%, 26% and 4%, respectively; the Mist 60min jujube yield than the control Mist 20min, Mist 40min respectively 49%, 20%, 2%; no difference in the quality of the dates of each treatment. (2) According to test soil water dynamics and root distribution of observational data using the RETC software for the physical parameters of the soil moisture; fitting a two-dimensional index root distribution model split analog District; rectangular finite element method and The seepage boundary drip irrigation at the mesh refinement; inversion identification of the model parameters using the observed data; irrigation amount of test translation. The above results into the HYDRUS (2D/3D) software to build a dynamic model to consider the two-dimensional root water uptake soil moisture. (3) use of HYDRUS (2D/3D) model of jujube root zone under drip irrigation growth period (179 days) within the Soil Water Dynamics conducted a simulation, the root mean square error of the simulation with the measured values ??of the moisture content of the soil volume ((?) RMSE) and relative average error (RMAE) test to simulate the effect, the results show that: the different layers of the jujube tree root zone soil moisture simulation is basically consistent with the measured values ??,0-60cm for uptake roots dense layer, moisture simulation with the measured values ??the RMSE in between 0.023-0.024cm3/cm3, RSAE 60-cm layer of moisture content of the simulation with the measured values ??of RMSE in between 0.007-0.008cm3/cm3, RSAE 1 - 13 to 14%; 2%. Dynamic two-dimensional distribution of the simulation results of typical irrigation cycle jujube tree root zone soil moisture analysis shows that, prior to the filling of the simulation area, after filling simulation with the measured values ??of the moisture content of RMSE for 0.009cm3/cm3 0.016cm3/cm3 RMAE 4.1 %, 5.6%. (4) with a model of different irrigation quota, irrigation frequency, irrigation date, weather conditions and irrigation system simulation studies and analysis of simulation results with the leakage rate, transpiration rate, evaporation rate as the evaluation index. The results show that the 45mm (30m3 / acre) irrigation quota irrigation times, 12 times the irrigation quota to 540mm (360m3 / acre), according to phenology, rainfall of the year to adjust irrigation interval to adapt irrigation system.
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