寄生植物可以通过吸器从寄主处获取大量的矿质养分（尤其是N）对寄主植物造成一定的养分胁迫，从而影响寄主和非寄主植物之间的养分平衡。因此，当寄生植物在农田或者草地中大面积存在时，可能会影响植物间的N转移，进而影响生态系统中物种间的相互作用和氮素循环。然而，关于寄生植物是否能驱动植物间N转移尚未有过报道。本项目拟通过控制条件下的栽培试验，采用分根与分室培养相结合的方法，利用稳定性同位素示踪技术，研究寄生植物驱动豆科和禾本科植物间N转移的主要途径和生理机制，并分析N转移对寄生植物和寄主植物生长及生理的影响，探究寄生驱动下植物间的N转移在缓解寄生杂草危害等方面的生态学意义。本研究首次开展寄生植物对植物间N转移的影响研究，不但丰富植物间N转移理论，还将为深入了解寄主植物-寄生植物-土壤微生物的三重互作关系、探究防控根部半寄生杂草的新策略提供科学借鉴与参考。

Parasitic plants can deprive a large amount of mineral nutrients (especially N) from host plant via haustoria, causing certain nutrient stress on host plants, and then affecting the nutrient balance between the host and non-host plants. Therefore, when parasitic plants are distributed in large areas in farmland or grasslands, they may affect the N transfer among plants, and thus affect the species interactions and the nitrogen cycle in ecosystems. However, it has not been reported whether parasitic plants can drive N transfer among plants. This project intends to explore the main pathways and physiological mechanisms of N-transfer from legume to grass driven by parasitic plant, via using stable isotope tracer technique, methods of root-separation and its combination with sub-cultures. By analyzing the effects of N transfer between plants on the growth and physiology of parasitic plants and host plants, the ecological significance of N-transfer driven by parasitic plants will be discussed. This was the first study to investigate the effects of parasitic plants on N-transfer among plants. It not only enrich the theory of N-transfer among plants, but also provide a reference for understanding the tri-interaction among host plants, parasitic plants and soil microorganisms, and open a new perspective for development of new biocontrol strategies in the management of parasitic weeds.