JOURNAL OF NATURAL RESOURCES ›› 2017, Vol. 32 ›› Issue (4): 553-567.doi: 10.11849/zrzyxb.20160487

• Resource Ecology • Previous Articles     Next Articles

Gradient Analysis and Comparison of Landscape Pattern along Different Transects in the Main Urban Area of Chongqing City

CUI Wang-ping1, LI Yang-bing1, 2, LI Xiao-ran1   

  1. 1. College of Geographical Science, Chongqing Normal University, Chongqing 401331, China;
    2. Key Laboratory of Surface Process and Environment Remote Sensing in the Three Gorges Reservoir Area, Chongqing 401331, China
  • Received:2016-05-09 Revised:2016-07-21 Online:2017-04-20 Published:2017-04-20
  • Supported by:

    National Natural Science Foundation of China, No.41261045; Key Basic Science and Cutting-edge Technology Research of Chongqing, No.cstc2015jcyjBX0128; Chongqing Normal University Graduate Student Research Innovation Project, No.YKC16003

Abstract:

The paper studies the influence of topography and economics on the evolution process of landscape pattern and its spatial-temporal difference in the rapid urbanization area, taking the main urban area of Chongqing City as the research object. Seven transects in north-south direction and east-west direction were selected on the basis of the unique geomorphologic characteristics and the economic environment in the study area. With the help of the Fragstats 4.2 and ArcGIS 9.3, the responses of transacts to the evolution of landscape pattern in the period of 1995-2014 in the study area were compared and the driving mechanism was analyzed with combined methods of gradient analysis and landscape pattern analysis. Results are shown as follows: 1) In terms of the change characteristics of landscape fragmentation and landscape diversity in the same period and direction transects, the values of PD and SHDI of the north-south transect c and the east-west transect f were the lowest and the highest values near the urban center, but away from the city center of the same direction transects are just the opposite. It is obvious that the differences of the whole landscape features are influenced by the urbanization level, terrain factors and policy-driven in the same period. 2) With the increased distance from the center of city (or hills and plateaus), the landscape fragmentation and landscape diversity of both the north-south and east-west transects continued increasing, while the landscape aggregation continued decreasing, and the connectivity between patches decreased. After the year of 2001, the impact of urbanization on the landscape pattern in the study area enhanced, but the impact of terrain factors weakened, and the dominant landscape changed from farmland to urban landscape. 3) During the period of 1995-2014, in the southern 18 km section of north-south transect c and the western 8 km section of east-west transect f where it is close to the urban and rural residents, the values of LPI were the highest. With urban sprawl, the LPI value became 100% at 6 km in the north of north-south transect c. Because of internal renovation of the old urban area since 2001, the AWMPFD values at 18 km in the south of north-south transect c and at 8 km in the west of east-west transect f dropped from the peak value to the lowest value close to 1. The research results show that the evolution of landscape pattern of Chongqing city has significant characteristics of spatial heterogeneity.

Key words: landscape pattern, response along transect, the main urban area of Chongqing City

CLC Number: 

  • P901