| Urban forestry is the cornerstone of urban green space construction,and urban green space is the embodiment of urban forestry in urban ecosystem service construction.However,it is still unclear how human socioeconomic activities and urban construction are affected by the structure and quality of green space itself,such as the influence of plant diversity within green space.Such influence may also be reflected in the change of POI(Point-of-Interest)spatial distribution and the difference in land use.For this reason,this study selected 16 green spaces such as Jiangtou Park in Xiamen Island as the research object,and studied the spatial clustering relationship of plant diversity in green space by using the global/local correlation analysis method of Geo DA software.According to the weight of principal component analysis,the distribution characteristics of POI and the changing trend of landscape patterns in different buffer zones of green space were analyzed.The spatial effects of plant diversity on POI and landscape patterns in green space were investigated by using partial least square regression(PLSR)and VIP values.Finally,the POI-patch landscape index was established by using the landscape pattern and POI data within 500 m of the green space.The main results are as follows:(1)According to the field investigation of plants,there are 114 species of trees in 16 green spaces,belonging to 40 families and 81 genera.Leguminosae is the most used plants.The green space plant diversity is not specified in the time of construction of plant diversity,and the global self-correlation is only the species(S),which has certain spatial aggregation characteristics,and the local self-correlation analysis finds that four indexes have certain clustering characteristics in the space.Species number in Dailiao Park and Buddha Hill Community Park formed a high-high clustering trend,and Moran’s I index was the highest,which was 0.29.Shannon diversity index showed a low-high clustering feature in Dailao Park and a high-high clustering feature in Buddha Hill Community Park.Pielou evenness index showed low-low clustering characteristics in Torch Park,margalef species richness index showed low-high clustering characteristics in Lotus Park,and simpson diversity index did not have clustering characteristics.(2)By gradient analysis of the landscape pattern around the green space,it is found that the maximum PD index decreases from 149.28 in the 100 m buffer to 61.07,and the average PD decreases from 96.74 to 42.21 when the buffer area increases from 100 m to400m.The average value of PD in the 700 m buffer decreased from 42.21 to 33.83,and the LSI increased from 6.51 to 8.74.As the buffer zone increases,the landscape pattern becomes more fragmented due to human activities.The average value of SHEI had no significant change,indicating that the patch distribution uniformity in the 400 m and 700 m buffer zones were similar,and the proportion of each patch type in land use tended to be stable.The maximum values of NP,PD,COHESION,SHDI,SIDI,SHEI and AI had not changed in the green space when the buffer area was 1000 m.The DIVISION index was0.97 in all the 6 green spaces,and the PR value was 18 in all the 3 green spaces with the same value.After the buffer was increased to a certain value,the number of patches and the degree of separation were similar to each other due to the influence of urban design.(3)The three POI with the largest number within 1000 m of the green space buffer zone in 2019 is shopping service,catering service,and life service.According to the principal component analysis and weight calculation,government institutions,social groups,and educational institutions account for the largest proportion within the range of100 m.After 600 m,the weight of government institutions,social groups,and educational institutions decreases simultaneously.When the buffer is larger than 600 m,the weight values of various POI classes tend to be stable.(4)According to the analysis of the partial least square method,the R~2 of the number distribution of six kinds of POI of government institutions and social organizations,catering services,life services,shopping services,medical institutions,and educational institutions within the 10 buffer gradients of 100-1000 m showed a " ∪ " trend,and the minimum value was near the width of 300-500 m.In the buffer zone of 0-500 m,the R~2 of the recreational POI always increases,and the R~2 of the buffer zone with a width of 300 m is the maximum of the 7 POI,and the R~2 value tends to be stable after 500 m.PARA,SHAPE,and FRAC,which represent the external shape characteristics of green space,are all larger than 1 in the five gradient buffer zones of 100-500 m,but not all of them are larger than 1.(5)The effect of plant diversity in green space on the landscape pattern in the buffer zone was as follows: the maximum R~2 in the buffer gradient of 100 m was LSI(0.65)and the maximum at the buffer gradient of 400 m was 0.39.The maximum value of R~2 is SIDI(0.44)at 700 m buffer gradient,and the maximum value of R~2 is SHDI(0.36)at 1000 m buffer gradient.When the distance from the green space is relatively close,the fragmentation degree and shape of the landscape pattern in the buffer area are greatly affected by the green space,while when the buffer area increases,the uniformity of patches distribution and the complexity degree of landscape structure are greatly affected by the green space.The VIP values of species number,margalef species richness index,and PARA were all greater than 1 in the four gradient buffers,and the maximum value was1.45 of PARA in the 100 m buffer.The five plant diversity indices in the green space of Xiamen Island showed different spatial clustering characteristics.Urban green space affects urban construction on a relatively large scale.By studying the distance effect and scale effect of green space on urban construction,this paper reveals the influence of green space on urban construction and provides a scientific basis for urban planning and ecological design. |
PDF Full Text Request