生物入侵被认为随着全球变化而增加，但相关的实验证据较少。氮沉降增加和降水格局改变是全球变化的两项重要内容，有关它们对植物入侵影响的研究资料非常有限，特别是当这两个因素同时发生时，外来种在什么程度上会优于本地种仍然不十分清楚，使评估和预测全球变化对生物入侵的影响还很困难。本项目选择菊科、豆科、禾本科的典型入侵植物及其配对的近缘本地植物，拟通过种植园实验，研究氮沉降和降水变化交互作用对入侵植物和本地植物生长、生理和竞争表现的影响；并且，通过在野外固定样地，构建本地植物群落，引入入侵植物和本地植物到群落中，研究氮沉降和降水变化交互作用对引入植物定居的影响。揭示入侵植物和本地植物的差异，从个体和群落两个生态学水平上阐明氮沉降和降水变化下外来植物的入侵性和生境的可入侵性及其响应机制，科学评估氮沉降和降水变化对植物入侵的影响，为全球变化背景下管理和控制外来入侵植物提供重要依据。

Although the problem of plant invasions is expected to increase with global change, there is as yet little experimental evidence. Increased nitrogen deposition and altered precipitation pattern are the two important factors of global change, while the experiments studying how the two factors affect plant invasions are still limited. It is not clear to what extent alien species should be favored over native species when the two factors change simultaneously, making it difficult to predict how global change will affect plant invasions. Only with a better appreciation of interactions between global change and plant invasions can decisions on minimizing their adverse effects be made. In this proposed project, we will conduct plant garden experiment to evaluate the interactive effects of nitrogen deposition and precipitation change on the growth, physiology and competitive ability of phylogenetically matched pairs of invasive and native plants (Bidens pilosa, B. biternata, Conyza canadensis, C. japonica, Senna tora, Tadehagia triquetrum, Paspalum conjugatum, P. thunbergii, Setaria palmifolia and Imperata cylindrical). Additionally, we will establish artificial native communities, which will be subjected to nitrogen deposition and precipitation change treatments in a factorial design in the field. The invasive and native plants were introduced into the communities to test their establishment ability. In so doing, we can found the difference between the invasive and native plants and illuminate alien plant invasiveness and habitat invasibility, as well as their response mechanism to nitrogen deposition and precipitation change. Therefore, we can reasonably evaluate the effects of nitrogen deposition and precipitation change on alien plant invasions. The results from this project will provide important fundamental materials for management and control of invasive plants under global change.