中文摘要：

通过野外样方调查，比较了入侵种北美车前（Plantago virginica）和土著种车前（P．asiatica）的生长特征与种间相对竞争能力。结果表明：北美车前的有性繁殖效力显著高于车前，而营养生长效力显著低于车前；其果穗数和果穗长明显大于车前，而叶面积则明显小于车前，说明北美车前较多地投资于繁殖生长，而车前较多地投资于营养生长；种间竞争和种内竞争明显降低了2种植物的平均每株果穗数、果穗长、单株地上生物量和单株总生物量；车前的种间竞争能力（相对邻里效应指数）显著大于入侵种北美车前，表明入侵植物北美车前目前不能对广泛分布的车前发生竞争取代。

英文摘要：

Based on intensive field investigation, this paper compared the growth characteristics and relative competitive ability between invasive Plantago virginica and native P. asiatica. The results showed that P. asiatica had higher vegetative growth effort, whereas P. virginica showed higher sexual reproductive ability. P. virginica was found remarkably in advantageous position in terms of mean spike length and spike number per plant than P. asiatica. However, the leaf area of P. virginica was smaller than that of P. asiatica. It was indicated that P. virginica invested most on reproduction, whereas P. asiatica invested on vegetative growth. Both intraspecific and interspecific competitions between P. virginica and P. asiatica negatively affected various growth parameters such as spike number per plant, mean spike length, individual＇ s above-ground bio- mass and its total biomass. The interspecific relative competitive ability measured as relative neighbor effect index （ RNE ） of P. asiatica was significantly higher than that of P. virginica. The results conclusively showed that P. asiatica would not be replaced by P. virginica in nature.