南疆红枣产业的快速发展导致农林争地矛盾突出及幼龄枣园综合生产能力低，加之大规模开展立体高效种植的经验不足，尤其是在南疆恶劣生态条件下开展生态位差异较大的枣棉间作种植尚没有成熟的经验可借鉴，影响了农业的持续发展，因此建立科学、合理的枣棉间作种植模式对实现农业高产高效具有重要的指导意义。本项目针对枣棉间作生产中存在的产量低、氮肥利用效率低等问题，在幼龄枣园采用间作种植方式，以提高复合系统氮肥利用效率为目标，采取田间小区和微区根系分隔试验，利用15N同位素示踪技术，研究枣棉间作系统根系时空分布规律及氮素迁移转化特征，探明土壤氮素供应与植株需氮的互作关系，揭示枣棉间作下种间氮素竞争的机制，进而探索提高农林间作复合系统氮素生产潜力的途径。研究结果将对幼龄枣园氮肥利用效率和综合效益的全面提升提供理论依据，为南疆干旱区农业结构调整、农林双丰收提供技术支撑，并为南疆地区其它果农间作模式合理施肥提供借鉴。

The jujube industry development rapidly in southern Xinjiang results to a series of problems such as the land-use contradiction between agriculture and forestry,and the lower young orchard comprehensive production capacity,there is little experience about large-scale multistoried cropping，especially lack of mature experience about carrying out jujube-cotton intercropping planting of the larger ecological niche differences in such bad ecological conditions which have apparently affect the sustainable development of agriculture.So reasonable agroforestry planting patterns has important guiding significance to the development of high-productivity and high-efficiency agriculture.To the issue of jujube-cotton intercropping development in the Tarim Basin such as low yield and nitrogen use efficiency,we take intercropping technology in the young jujube orchard, improve nitrogen use efficiency as the goal of composite system,take field plot test and root separation micro area test which use the 15N isotope tracer technique to study time and space distribution rule of root system and nitrogen transformation characteristics,explore the relationship between soil nitrogen supply and plant nitrogen requirement during the growth,reveal interspecific nitrogen competition mechanism in jujube-cotton intercropping system, and then excavate a way of improving nitrogen production potential in the agro-forestry compound system.The results will provide theoretical basis to promoting nitrogen use efficiency and comprehensive benefits in the young jujube orchard,meanwhile,they also provide technical support for adjustment agricultural structure, promoting great harvest of agriculture and forestry in southern Xinjiang arid areas, these experiences about reasonable fertilization can be used for reference by other agroforestry planting patterns in southern Xinjiang.