Biotic homogenization is a major component of current biodiversity crisis involving increase in floristic, functional and genetic similarity of biotas resulting from species invasions and extirpations. Since habitat type is a good predictor of success of biological invasion at local scale, we studied distribution and abundance of native and alien plant species in eight habitat types namely lakes, wetlands, riparian, roadsides, orchards, grasslands, scrubs, and forests (06 sites each giving a total of 48 sites). For estimating taxonomic homogenization index, we calculated Jaccard’s similarity index separately for native, alien and alien + native species. We also calculated functional α, β, and γ diversity for three functional traits in three different ways i.e. with all species included, with only native species included and with only alien species included. We observed that habitats differ with respect to functional and floristic diversity. Aquatic habitats (species poor) were found to be more homogenous (average β_A = 0.58) than terrestrial habitats (average β_A = 0.68) with man-managed habitats (orchards) being taxonomically (average β_A = 0.59) and functionally (Fβ_A = 0.04) most homogenous among terrestrial habitats. Present study revealed that traits of alien plant species play an important role in determining the homogenization potential as invasives (in comparison to naturalized and casuals), perennials (in comparison to annual/biennials), herbaceous (in comparison to shrubs/sub-shrubs/lianas and trees) and submerged plants (in comparison to free floating, rooted floating and emergents) were found more homogenizing. These observations are crucial in understanding the homogenizing effects of alien species and in particular the underlying impact of taxonomic homogenization on functional stability of ecosystems.

生物同质化是当前生物多样性危机的一个主要组成部分，涉及物种入侵和灭绝导致的生物群在植物学，功能和遗传上的相似性增加。由于栖息地类型是当地生物入侵成功的良好预测指标，因此我们研究了湖泊，湿地，河岸，路边，果园，草地，灌木丛和森林这8种栖息地类型中本地和外来植物物种的分布和丰富度（06每个站点总共提供48个站点）。为了估计分类均质指数，我们分别计算了本地，外来和外来+本地物种的Jaccard相似度指数。我们还以三种不同方式（包括所有物种在内）计算了三种功能性状的功能性α，β和γ多样性。仅包括本地物种，并且仅包括外来物种。我们观察到，生境在功能和植物多样性方面有所不同。发现水生生境（物种较差）更均质（平均β_甲 = 0.58）比陆地生境（平均β_甲 = 0.68）与人管理的栖息地（果园）为分类学（平均β_甲 = 0.59）和功能（Fβ_甲 = 0.04）在陆地栖息地中最均匀。目前的研究表明，外来植物物种的性状在确定同质化潜力方面起着重要作用，例如入侵性（与自然化和临时性相比），多年生（与一年生/双年生相比），草本（与灌木/亚灌木/藤本植物和树木）和被淹没的植物（与自由漂浮，有根漂浮和紧急情况相比）更加均质。这些观察对于理解外来物种的同质化作用，尤其是生物分类同质化对生态系统功能稳定性的潜在影响至关重要。