Study On The Plant Diversity Of Urban Green Space System In Huaihua City

According to consulting greats quantity of literature datum, and following by the principles of scientificalness, representativeness and utility, then using the plants of diversity, Ecological benefits of green space and Green space landscape effect as the first level indexes, an appraisal system of urban green space system, which was based on the plant diversity, was established by this studies.Secondly, we firstly investigated the ecological benefits, plant configuration model and landscape effects of urban green space system in Huaihua city. The results showed that plant diversity in urban green space system of Huaihua city was low, as evidenced by low plant species richness, high proportion of evergreen species, the unreasonable vertical layers spectrum, low proportion of trees and high degree fragmentation of green space. Ecological benefit evaluation of the green space system showed that it generally goog with good oxygen enrichment effect, cooling effect and moisturizing effect in the summer, but evaluation of landscape showed that it needed to be improved. Base on these results and the biodiversity theory, we then proposed a theory and method for urban green space system planning, which are systemic planning of urban green space system and ornamental plant planning.In summary, our study showed that:(1) the plant diversity of urban green space system is a basic aspect of urban construction. The richness of plant diversity is positively associated with the ecological benefit of urban green space system. The whole urban ecosystem is composed of local ecological environment, but it is not a simple accumulation of individual local ecological environment.(2) In addition to plant species and number, relevant factors, like ecological benefits and landscape effects of urban green space system should also be taken into consideration in the selection of evaluation index for plant diversity evaluation. Here we used plant species diversity (MP), eco-benefit (ME) and landscape effects (ML) to establish the plant diversity evaluation system of the urban green space system.(3) Increasing the variety of plant species is the most direct means to raise the level of plant diversity. Rational allocation of garden plants and enrichment of vertical layers spectrum are supplementation to improve the level of plant diversity.(4) Cultural connotation and local characteristics should be valued in the improvement and evaluation of plant diversity of urban green space system.