农林复合系统是一种现代化土地利用模式，因其对环境资源的充分利用、较高的经济收益和稳产，已经越来越为人们所关注。本课题以典型的果粮间作多熟立体种植模式（枣树/冬小麦、核桃/冬小麦）为研究对象，依托石河子垦区果粮间作长期定位试验站，研究间作系统内的种间根系互作和养分高效利用。利用根钻法、N-15同位素示踪法研究四、六、八年生枣树/冬小麦、三年生核桃/冬小麦两种间作系统内的根系动态变化、种间根系相互作用和对养分的竞争、补偿吸收利用，阐明果粮间作养分累积、根系动态分布、种间根系互作之间的关系以及这种关系存在的机理，为制定合理的根系调控技术、形成基于根系对养分资源高效利用的优化配置模式提供理论依据和生产实践指导。

Agroforestry system is an kind of modern pattern of land use and received increasing interest because they offer potential advantages for resource utilization (land, light and temperature), higher economic returns to farmers and increased sustainability in crop production. This research take jujube tree/ wheat system and walnut tree/ wheat system as objects of study to discuss root interspecific interactions and high nutrient efficiency of systems. The soil core method and the stable isotope tracer method were used to measure the dynamic change of root, root interspecific interactions and the competitive and compensation for nitrogen in the intercropping systems. The specific crops include four-year-old jujube tree, six-year-old jujube tree, eight-year-old jujube tree, three-year-old walnut tree and white. The ultimate goal of the study is to clarify the relationship among nutrient accumulation, dynamic change of root and root interspecific interactions and the mechanism for the relationship. The research results will provide theoretical basis and meaningful instructions for making optimum technology of root adjustment and model for optimal allocation of soil resources.