滴灌技术显著提高了黄土丘陵山地密植枣林的经济产量，为陕北红枣产业发展提供了一条经济与生态效益共赢的高效途径。而根系调控是影响产量和品质的关键。滴灌条件下密植枣林的根系分布特征及其影响机制与传统稀植乔化无水肥管理的枣林区别明显，亟待研究。本项目以黄土丘陵山地密植枣林为研究对象，以"水"为突破口，引水上山实施滴灌密植枣林，采用剖面法、挖掘法等野外定位试验和室内分析处理相结合的方法，系统研究滴灌条件下密植枣林群体根系的分布特征，揭示滴灌频率、滴灌水量、滴灌位置这3个滴灌技术要素对黄土丘陵区密植枣林群体根系分布的调控作用，阐明滴灌技术对密植枣林群体根系分布的调控机理，评价滴灌技术要素对枣树生长、产量和品质的调控效果，筛选出以高产优质为目标的适宜黄土丘陵区山地密植枣林的滴灌调控方式，为黄土丘陵半干旱区密植人工经济林水肥高效管理提供科学依据，对国家退耕还林工程后续可持续发展有重要的科学意义和现实价值。

Drip irrigation has greatly improved the densely planted jujube (Ziziphus jujube Mill. CV. Lizao) plantation economic yield in the loess hilly region and provided a mutual efficient approach in economic and environmental benefits of jujube industry in north Shaanxi. Root regulation is one of the key influence factor in jujube yield and quality. Root distribution and regulating mechanism under densely planted pattern is urgently needed to be studied because it was obviously different with those that were traditional spaced planted without water and nutrient management regime. The project oriented densely planted jujube plantation, with water as a breakthrough, we carried out drip irrigation engineering in the densely planted jujube plantation. We will study spatial root distribution of the densely planted jujube plantation systematically under the drip irrigation measures with the field positioning observation in trench profile method and indoor analysis method, determine the drip irrigation technology regulation effects (drip irrigation frequency, drip irrigation water amount and drip irrigation position) on root distribution, reveal drip irrigation technology regulation mechanism, evaluate drip irrigation technology regulation effect on jujube tree growth, fruit yield and quality, propose the root distribution optimization pattern and drip irrigation control methods aimed at jujube fruit high yield and good quality and improve the economic and ecological benefits together. The study will provide scientific basis for efficient water and nutrient management of densely planted artificial forest. The study has the important scientific significance and realistic value on the sustainable development project of converting farmland to forestland in the loess hilly region.