Global environmental changes are believed to promote the invasion of many invasive plant species, especially under nitrogen enrichment conditions. However, it is unclear, how invasive plant species respond to nitrogen enrichment along with water deficit. In this study, competition of invasive plant (Wedelia trilobata, W_T) was studied with its congener native (Wedelia chinensis, W_C) under three levels of nitrogen (control, additional and double additional), two levels of water (normal and deficit) and three types of culture (single, mono and mixed). The result showed that under control treatment and additional nitrogen, the growth of W_T was 30% higher than W_C in all cultures but under additional nitrogen along with water deficit the growth of W_T was 20% lower than W_C within single plant and monoculture. Under competition, biomass, specific leaf area, root-to-shoot ratio, leaf chlorophyll content and leaf nitrogen of W_T were 20–40% decreased as compared to W_C under water deficit along with nitrogen addition treatments. These results indicated that competitive interaction between W_T and W_C was altered by additional nitrogen together with water deficit. It provides exceptional evidence that vigorous invasive species become weak competitor under additional nitrogen along with water deficit.

据信全球环境变化促进了许多入侵植物物种的入侵，特别是在氮富集条件下。但是，目前尚不清楚，入侵植物物种对氮素富集和水分亏缺的反应如何。在本研究中，研究了入侵植物（Wedelia trilobata，W _T）与其同类同源植物（Wedelia chinensis，W _C）在三种氮水平（控制，附加和双重附加），两种水平的水（正常和亏缺）下的竞争。）和三种文化（单文化，单文化和混合文化）。结果表明，在控制处理和氮肥条件下，W _T的生长比W _C高30％。在所有栽培中，但在额外的氮和水分亏缺的条件下，单株和单株栽培中W _T的生长比W _C低20％。在竞争下，与缺水和施氮处理后的W _C相比，W _T的生物量，比叶面积，根茎比，叶绿素含量和叶氮降低了20-40％。这些结果表明，W _T和W _C之间的竞争相互作用被额外的氮和水分亏缺所改变。它提供了特殊的证据，表明在其他氮素和水分短缺的情况下，强大的入侵物种成为弱竞争者。