Particle Size Effect Analysis And Index Temporal And Spatial Dynamics Of Landscape Index In Shenzhen City

Landscape index is an important method in land use landscape ecology research,and it is also an important index in many land use evaluation,but it is influenced by spatial granularity.The analysis of the granularity effect of landscape index is beneficial to the more scientific analysis and research of land use.In this paper,Shenzhen City,which is located in the rapidly urbanized area,is selected as the research area.Under the support of GIS,the spatial data of land use in Shenzhen are divided into 10m × 10m,20m × 20m,30m × 30m,40m × 40m,50m ×50m,60m × 60m,70m × 70m,80m × 80m,90m × 90m,100m ×100m,and the landscape index of seven groups at different levels And the landscape index of different grain size was calculated by using the landscape index analysis software Fragstats4.2.Based on this,the appropriate grain size interval of land use index index of Shenzhen was determined by scale domain analysis and information loss evaluation.Finally,the temporal and spatial dynamics of landscape shape index(LSI),ensemble degree(AI),Shannon diversity index(SHDI)and Shannon Evenness Index(SHEI)during the period from 2009 to 2013 were analyzed with the best granularity.This paper analyzes the impact of the rapid urbanization process on land use in Shenzhen.Research indicates:(1)The selected landscape index has a very obvious granularity response,and the numerical value of the index shows the following trend with the particle size:the number of patches,perimeter,landscape shape index,degree of aggregation and other landscape index with the increase in particle size has varying degrees The area ratio,the Shannon diversity index and the Shannon Evenness Index fluctuate around a certain value with the increase of the particle size.(2)Based on the scale domain analysis and the evaluation of information loss,it is determined that the suitable grain size range of land use index in Shenzhen is 30-40m.(3)Using the best granularity of Shenzhen 2009-2013 data for landscape index calculation,we can see that in Shenzhen during the five years,with the continuous improvement of urbanization level,construction land area greatly increased,the natural landscape area greatly reduced.This has a far-reaching impact on the ecological landscape of Shenzhen.