| Urban biodiversity is the foundation of urban sustainable development .And as the body of urban biodiversity, urban plant diversity plays a very important role to improve the urban environment and the lives of urban residents. However, with the accelerated process of urbanization, a lot of farmland, wetlands, forests and other non-urban land use were transformed into urban land, making the original vegetation damaged to a large extent, reducing a large number of native plants. Due to human aesthetic and green garden building needs, a large number of foreign ornamental plants were introduced to the city, making the city more exotic plant and less native plants , it not only diverted surviving the space of native plants, but also brought the invasion of exotic plants, which made the local ecosystems under great threaten. It's an important way to protect and built the urban diversity by the researching of plant diversity in urban park, where the diversity is richest and it's the body of the city green system.This article selected nine different types of parks in Wuhan, and carried out a full investigation. Meanwhile, by contrast, we take the forest park as an object to evaluate the effect of urbanization to the plant diversity. There are following key elements:1. The directory of plants in the park. There are 508 plant species in urban parks belonging to 136 families 324 genus, of which 225 plant species are alien, and 283 plant species are local while there are 360 plant species in suburb park,belonging to 110 families 256 genus, of which 116 plant species are alien ,and 244 plant species are local. there are a total of 644 kinds of plant species in the field survey of eight city parks and a suburban park , belonging to 136 families 324 genus, and of which 367 kinds are local plants and 277 kinds plants are exotic .2. Analysis of exotic plants in Wuhan.In the survey,, a total of 277 kinds of exotic plants is belonging to 86 families 201 genus, of which 145 herbaceous plants, 132 wooden plants,262 cultivated species, as ornamental plants about 242 species.There are 100 kinds introduced from China 100 , 72 from America,31 from Europe and 74 kinds from Asian and African countries. The family are more than 10 kinds :cupressaceae 13, Rosaceae 10, leguminosae 13, caprifoliaceae 12, Compositae 31, gramineae 21, Oleaceae 10, Liliaceae 10.Invasive species are a total of 29 species belonging to 15 families and 24 genus, as ornamental plants and landscape use are introduced 10 species, accounting for 34.5 % of the lnumber of the invasion. There are 21 kinds of invasive plants from American , accounted for 72.4%, the other from Europe, Africa and some other parts of Asia.3. The protection of plant diversity in Wuhan.The protection of plant diversity includes two aspects: a single plant species conservation and ecosystem protection.As single plant species protection, we must first solve the problem thatwhich species is protected firstly . There are four standards of the choice:(1) Cherish endangered, local, threatened status and its usefulness(2)the Species's status in the ecosystem and communities.(3)Significance of the evolution of species(4) the plant species of a specific cultural significanceThe protection of the ecological system is mainly included forest ecosystems and wetland system . At the same time, it should be emphasized that the application of plants in the garden design , especially the native plants,learning the way of appling vegetation to control urban development in urban construction.
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