陕北山地枣树微灌土壤水分入渗特性与耗水规律试验研究.doc

论文题目：陕北山地枣树微灌土壤水分入渗特性与耗水规律试验研究 学科专业：农业水土工程 摘要 本文在查阅国内外相关文献资料的基础上，结合国家科技支撑项目采用和，主要研究了和水分利用效率，主要研究成果为：分利用效率随灌水定额的增大先增大后减小STUDY ON THE CHARACTERISTICS OF MICO-IRRIGATION SOIL WATER INFILTRATION AND JUJUBE OF WATER-CONSUMING LAW IN NORTHERN SHANANXI MOUNTAIN Major：Agricultural soil water engineering Name： Jun Cao Signature：Supervisor：prof.Liang jun FEI Signature： ABSTRACT On the basis of inspection of theory and technology at home and abroad,with major national scientific and technological support projectsThe technology research and demonstration of fruit characteristics of semi-arid mountainous Shaanxi comprehensive water-saving.Major study on the character of wetting front migration and water distribution under single emitter and two emitter drip irrigation,and study on the character of wetting front migration and water distribution under the root irrigation;Studied on water-consuming law,WUE and studied on the effect of soil temperature.The main findings as follows: (1)Studied on the character of wetting front migration and water distribution under single emitter and two emitter drip irrigation at the conditions of undisturbed soil in northern Shaanxi.Come to a single emitter wetting front migration in line with the power function relationship;Extended over time,migration rate of infiltration wetting front decreases,and the vertical direction of the wetting front migration rate is greater than the level of the direction of wetting front migration rate;Moisture content gradually decrease with depth increase;Moisture content gradually increase with the dripping flow rate and irrigation duration increase. Under pairs of emitter condition,the interface body of horizontal and vertical water infiltration rate is greater than the rate of emitter bottom migration at the same time;soil moisture content gradually lower with the distance of emitters increase;Emitter spacing is constant,soil moisture c