Study On The Species And Distribution Of Invasive Plants Along The Highway

Based on the investigation of the highway from Huangshi to Huangmei (Abbreviation: Huang-huang highway),the traditional plant ecology and the modern biostatistics, three questions are researched which include the kinds and distribution of invasive plants in spring along the highway,the influence of different habitats and the project structure on invasive plants, the law of invasive plants in different forest-communitys along the highway. Finally, the influence of the highway construction on the forest-communitys is discussed from a side.The main results are as follows:1. Kinds and distribution of invasive plants in spring along the Huang-huang highway.24 species of invasive plants belonging to 23 genuses, 16 families are identified. There are 6 species belong to Compositae,which is the most. Following the Compositae, the Papilionaceae and the Scrophulariaceae consists of 2 species.Among the invasive plants which originate from various regions in the world, 15 species originate from America.Principal Component Analysis(PCA) and Hierarchical Clustering Analysis(HCA) demonstrated that 24 kinds invade plants can be divided into 5 clusters groups. Cluster group I includes Plantago virginica, Alternanthera philoxeroides, Aster subulatus ,Pistia stratiotes,Ranunculus arvensis, Coronopus didymus,Medicago hispida and Pharbitis nil. Cluster group II includes Lepidium virginicum and Chenopodium ambrosioides. Cluster group III includes Oxalis corymbosa and Trifolium repens. Cluster group IV includes Conyza Canadensis, Erigeron annuus, Gynura crepidioides, Veronica didyma, Veronica persica, Euphorbia helioscopia, Phytolacca Americana, Geranium carolinianum and Bidens pilosa. Cluster group V includes Avena fatua, Daucus carota and Ambrosia artemisiifolia. The species in every cluster group have many similar customs.2. The influence of highway construction on invasive plants.4 cluster groups were gained from the dimensional scatter plot of PCA radination for 27 sample areas. Cluster group I includes railway crossing, borrow pit, side slope and forest-community. Cluster group II includes highway crossing, service area and precinct, toll station, field curtate.Cluster group III includes lake district, beach wall, paddy field,which has high soil moisture content,Cluster groupâ…£includes one community type which is citrus Cash-tree.3. The influence of highway construction on the forest-communitys17 species of spring invasive plants in 6 kinds of forest-communitys types are identified and recorded in which Compositae is the most and the species originating from America is the most. The species richness index of invasive plants and the total plants appears the ruly change.The protective screening and the collecting passage of the highway also played the contribution role. 6 kinds of forest-communitys types have the different discrepancy by One-way ANOVA analysis.