Evaluation Of Maintenance Needs Of Urban Green Space System In Cold Region

With the rapid urbanization process in China,the green space system in the city is also under construction and development.In the long-term use of green space,there is a problem of declining environmental quality.How to design and build a green space system that does not increase the maintenance cost and can provide ecological services in the long and long term in the use process needs to build an evaluation model corresponding to it.This paper takes the maintenance of community green space system as the research object,constr ucts the maintenance cost evaluation model of community green space system,fills in the blank of the maintenance of urban green space evaluation,provides applicable practical methods for the current evaluation of green space system,and provides scientific basis for the design and management and maintenance of community green space system.This paper firstly constructs the theoretical basis and method system of evaluation system and model,then selects the framework and indicators of evaluation system,and finally applies the evaluation of typical communities.Based on the comprehensive evaluation theory,the maintenance cost evaluation model of urban community green space system is studied.Based on the relevant theories of landscape ecology,this paper studies the root of green space system maintenance and the factors affecting green space maintenance,and takes this as the theoretical basis for the construction of evaluation system framework and the selection of indicators.By applying the quantitative ecology theory,this paper studies the method of collecting the related variables of evaluation indexes in the case.The principal component analysis method adapted to the maintenance cost evaluation of green space system is used as the evaluation tool.The evaluation model of green space system maintenance cost is constructed based on the operation principle,operation program and analysis method of principal component analysis.Based on the above research,the following conclusions can be drawn: the maintenance cost evaluation model of community green space system includes three parts: evaluation system framework,evaluation index and data analysis program;The evaluation framework includes;Richness,vertical structure,inter-species relationship,etc.Simpson diversity index,entropy value,competition index,soil comprehensive response index and other 11 indicators;The evaluation model of dimensionless,constitutive and synthetic operations.The result of testing and evaluating the curve community green space shows that most of the green space in the curve community is generally low,and 54% of the sample plot score is negative.These low-scoring green Spaces require more manual maintenance.According to the evaluation results,corresponding design Suggestions are obtained: Increased diversity by 4 to 8 species;The planting of herbaceous layer plants to enrich the structure with the average species diversity.In view of the environmental and maintenance problems caused by human activities and landscape effects in the current green space system planning and design,this paper proposes an evaluation model guided by the theory of statistics and quantitative ecology,and proposes the design countermeasures based on the evaluation model with the theoretical basis of ecology.It is of guiding significance to the green space planning and design of urban environment and ecological problems.