外来生物入侵已经成为全球关注的一个热点问题。外来入侵植物不仅可以通过对土壤、水分和光照等资源的高效利用来排挤和抑制本地植物，而且也可以通过共享传粉者的途径来影响土著植物的有性繁殖成功。另外，外来植物的入侵作为一种强大的选择压力，也会促使某些土著植物快速地在表型性状上表现出适应性的改变。目前对入侵种的进化生物学关注较多，但缺少对土著植物在外来种入侵压力下的繁殖对策和响应机制的研究。本项目将以我国横断山区广泛分布的两种入侵植物白花车轴草和柳兰以及与之同域共存的土著植物为研究对象，从种群水平和群落水平上研究入侵植物对土著植物有性繁殖成功的影响；通过表型选择的方法寻找本地植物应对外来植物入侵的响应证据。以期从繁殖和适应的角度探求入侵植物与土著植物之间的复杂关系，并为有效管理和控制外来杂草提供科学依据；同时也为入侵植物-土著植物的种间关系研究提供新思路

Biological invasions have become a global phenomenon. Invasive plants reduce the biodiversity of native plant communities through strong vegetative competition, often outcompeting naitve plants for sunlight, soil and water, and overwhelming naitve comnnunities through high reproductive output, altering functioning of ecosystems. In addition, invasive plants can also reduce the fitness of their native neighbors through competition for pollinator services. Despite the dramatic effects of many invasive species, it is still possible in many places to find native species coexisting with exotic invaders. Therefore, invasive plants can be treated as the strong selective force exerting on the rapid adaptation and evolution of remnant natives in introduced communities. During the past decades, more attention has been paid to the evolution of alien species, with less attention to the alternations in sexual reproductions and the adaptation of remnant natives. In this research project, we will conduct a series of experiments to two invasive pants (Trifolium repens and Chamaenerion angustifoliumin) and native plants in Hengduan Mountains Region located in southwest China, to address (1) the effects of plant invasions on sexual reproductive success of the remnant natives through intense competition for the sharing pollinators at populaiton level; (2) how the invasive plants affect native communites through pollinator networks and pollen transfer networks at community level; and (3) what possessed adaptations of these remnant natives allow them to persist in invaded environments. The answers to these questions will provide some theoretical basis for the control and management of alien plants and shed some light on the rapid response of native plants to selective pressures exerted by alien plants.