| The city is the main area of human habitation.As the process of urbanization accelerates,many problems begin to emerge,and the green landscape of urban heat island effect,carbon fixation and oxygen reduction,urban air pollution and urban biodiversity are more and more Social concern.Landscape connectivity is the main indicator of regional land sustainable use and biological protection.It is the material basis of species richness and migration process in human disturbance area.This paper introduces the method of Morphological Spatial Pattern Analysis(MSPA)based on mathematical morphology to study the influence of urbanization process on urban green landscape connectivity in Shanghai.Through the analysis of timporal and spatial,the paper studies the influence of different urbanization processes and stages on urban environment and the change of green landscape connectivity.This article mainly from the following four aspects:(1)Study on Vegetation Coverage.Through the study of the temporal change of vegetation coverage in Shanghai,the results show that: The proportion of land use classification in 1995-2015 was classified as vegetation > construction land > water > unused land;The area of vegetation disappearance in 1995-2005 was larger than that in 2000-2015;The disappearance of vegetation in the spatial distribution shows that the area of vegetation disappear in 1995-2005 is mainly concentrated in several areas around the central urban area,such as Baoshan District in the north,Jiading District,Minhang District in the south,Pudong New Area in the east,Qingpu District,Songjiang District Of the northeast and so on;From 2005 to 2015,the areas where vegetation disappeared were relatively dispersed,and there was a tendency to expand to the outer circle in Shanghai.(2)Green landscape connectivity.The vegetation cover pixels were covered with full coverage and transformed into grid binary map.The morphological spatial pattern analysis method was used to classify the green landscape connectivity,and seven types of green landscape structures with different connectivity were classified.The results show that the core area and the perforation area decrease year by year from 1995 to 2015.The islet area,loop area,bridge area and branch area increase year by year.The decline of green landscape connectivity has a certain lag,usually after the fragmentation of regional green landscape.In addition,the two types of green landscape,the patch area and the feeder area,are vulnerable to human disturbance.(3)Study on Urban Surface Temperature.Using the Landsat TM to retrieve the surface temperature,and with the weather station observation data validation,the remote sensing image of Shanghai for several periods of surface temperature information extraction.The results show that the area of the surface relative temperature difference between 1995 and 2005 is relatively large and has a relatively concentrated area,mainly distributed around the central urban area.In 2005-2015,the distribution of the relative value of the surface temperature difference is relatively fragmented,there is no concentrated area,and then the distribution of the location is no longer around the central city,but the evolution of the outlying areas of Shanghai.The development of urbanization in Shanghai and its development trend from the inner circle to the outer circle.(4)The correlation between the green landscape connectivity and the surface temperature was analyzed,the results show that the absolute value of R in the core and islet is more than 0.8,which is-0.879 and 0.849 respectively,and there is a strong correlation with the regional relative relative heat.The absolute value of R in the perforation 、edge、loop is between 0.5 and 0.8,which is-0.620、-0.586、-0.692 respectively.The results show that the correlation between the three types of perforation 、edge、loop and the average relative heat of the region is moderate. |
