| Road landscape is the first scenic line that tourists can see when they enter the city.It is a part of the city development that must be paid attention to.It plays an indelible role in protecting the city landscape and displaying the city style.In today's rapid development of urban construction,road construction is also facing a series of problems.Firstly,from the point of view of landscape connectivity,this paper elaborates the development process and background of the theory of road greening and landscape connectivity at home and abroad,and analyses the related theories.Then,it elaborates the concepts of landscape connectivity and road landscape unit,which provides a theoretical basis for the subsequent evaluation of the article.It summarizes the measurement methods and evaluation of landscape connectivity of road landscape unit.Price principle and specific evaluation process based on landscape connectivity theory.Finally,taking the Ring Chaohu Landscape Avenue as an example,this paper attempts to apply the theory of landscape connectivity to the evaluation of the landscape unit of Ring Chaohu Avenue,and provides practical and effective greening suggestions for the construction of Ring Chaohu Avenue.By investigating the plant communities around Chaohu Avenue,the plant diversity index was analyzed.Then the land use maps were analyzed by remote sensing in 2005(before the construction of Chaohu Avenue),2010(mid-term construction of Chaohu Avenue)and 2015(late construction of Chaohu Avenue).The NC(component number)and PC(possible connectivity index)of plant patches were calculated by visual interpretation.By comparing the three stages of landscape connectivity index,the impact of the construction of Ring Chaohu Avenue on the landscape connectivity of the study area is analyzed.Then the network corridors of the study area are calculated,and the connectivity and complexity of the corridor network of the study area are analyzed,and reasonable greening suggestions are put forward for the network connectivity of the study area.The results are as follows:(1)The survey shows that there are 37 tree species,and the richness index in the sample plot is between 8 and 11,which indicates that the number of plant species in the area around Chaohu Lake fluctuates less and the species are more stable;the species diversity index of the sample plot is more than 1,which indicates that the area around Chaohu Lake is rich in plant species;the evenness index is between 0.8 and 0.9,and there is no obvious dominant species.(2)By calculating the PC values of the three periods in 2005,2010 and 2015,under the same threshold,the PC values before the construction of the Ring Chaohu Avenue are larger than those after the construction of the Ring Chaohu Avenue,which shows that the construction of the Ring Chaohu Avenue affects the landscape connectivity of the Chaohu Lake region.(3)After the construction of the Ring Chaohu Avenue,the alpha index of Sanhe Ancient Town and Yinpingshan District is relatively low.In the later construction of the Ring Lakes Avenue,the connection with the area should be strengthened;the beta index of the four areas connected by the Ring Chaohu Avenue is greater than 1,and the value is about 3,which shows that the connection of the four areas is more complex;in the calculation of the beta index,the gamma index of the four areas is from 0.5 to 0.6.Around,the number of connections between network nodes is relatively large,and the network is relatively complex.In the process of construction,attention should be paid to the timely increment of roads.This paper mainly evaluates the road landscape unit by qualitative and quantitative methods,and obtains the road evaluation strategy based on landscape connectivity through research.It is hoped that this attempt can provide some help for the evaluation of road landscape unit. |
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