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The Research of Hefei Urbanization Process and Urban Forest Pattern Dynamic Change

Author: YangGuang
Tutor: WuZeMin
School: Anhui Agricultural University
Course: Ornamental Plants and Horticulture
Keywords: Land use Urban forest Landscape Pattern Driving force factors Hefei
CLC: S731.2
Type: Master's thesis
Year: 2010
Downloads: 78
Quote: 0
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Abstract


This paper RS ??and GIS spatial analysis techniques, combined with four periods of Landsat TM images, comparative analysis of Hefei, 1989, 1995, 2003 and 2007, land use pattern dynamic changes. By Fragstats3.3 calculate the the landscape index analysis process and characteristics of the dynamic changes in the urban forest landscape pattern. Meanwhile, the combined to Hefei population, economic and policy factors such as analysis of the driving forces of landscape pattern change. The results are as follows: (1) the use of the land classified as arable land, buildings and pavement, urban forest (specifically refers to the class of crown cover greater than 30% of the land), general green space (crown cover less than 30% of the land type artificial turf on the outskirts of natural grass), waters and bare land (uncultivated nor the type of vegetation cover, land, and also includes the development to be building land). Erdas in statistical analysis functions, as well as land-use transfer matrix analysis of land use dynamic change. Results show that from 1989 to 2007, farmland and urban forest tended to decrease, farmland reduced 20790.36hm2 of its total land area increased by 73.27% to 44.34% decline in order, the annual rate of change of 2.19%, the expansion of urbanization land basic on the occupation of agricultural farmland; urban forests reduce 486.18hm2 its total land area increased by 7.7% decline in the order of 7.03%, 0.49% annual rate of change. An increasing trend in other classes, including construction and paving increase 19404.9hm2 its total land area ratio 39.01% 11.98% rise in order, the annual rate of change of 12.7%; generally green space increase 450.9hm2 14.6% annual rate of change ; bare land and water has increased fluctuations. 18 years each class space changes mainly farmland, buildings and pavement, as well as urban forest conversion between. (2) between 1989-2007, the number of patches and patch edge density Hefei range overall upward trend, the increase shows that the Hefei landscapes are under various disturbances, landscape combination pattern becomes more complex by the simple; landscape shape index increased more obvious, Hefei landscape boundary more complex, degree of plaque irregular shape; urban landscape horizontal dimension fluctuation is very small, indicating that each landscape type patch shape in that period did not change much; landscape diversity index and landscape evenness increased in that Hefei landscape diversity level has been increased gradually increased, the heterogeneity of the landscape pattern; fragmentation index has been an upward trend, landscape type distribution tends to be dispersed due to human role in increase leaving the landscape shapes become more complex. (3) the period of 1989-2007, the urban forest landscape pattern with the the Hefei land use pattern change and change. Hefei range urban forest patch number and edge density increase, while the urban forest area declined, these changes indicate that the the Hefei Urban Forest landscape structure over time more rich and complex changes, increase due to anthropogenic interference by landscape boundary segmentation of the extent and degree of fragmentation increased, Landscape combination pattern becomes more complex by the simple; landscape shape index increasing complexity of the boundary of the urban forest landscape patch shape with round quite different, irregular shape complex; shape tends to change the shape of the three periods of urban forest patch characteristics are not the same, the dramatic changes in the 1989 - 1995 period, the urban forest patch shape index, rose from 59.2238 to 103.0047 plaque in the shape change more complex; forest patch shape index in the period 1995 - 2003, from 103.0047 to 107.4157; forest patch shape changes are not dramatic in the 2003 - 2007 period, the the plaque shape index reduced from 107.4157 to 109.3692. Landscape fractal dimension were above 1.2, indicating that the more complex and irregular shape of each plaque; dimension is gradually increased from 1989 to 2003, respectively, indicating that this stage of the urban forest patch shape tends to be complex and irregular, but after 2003, the fractal dimension of the urban forest landscape elements apparent decline, from 2003 1.4595 down to 1.2873, apparently in urban construction in recent years has begun to pay attention to build some of the larger urban forest spot block, the complexity of the shape has also been reduced. Fragmentation index has been an upward trend, the aggregation index fell to 2003 from 1989 90.7309 77.6591 This reflects the plaque was to scatter smaller plaque, a higher index of forest landscape fragmentation. Patch fragmentation of the urban forest is the most dramatic performance in the 1989-1995 time period, while little change between 1995-2003, a slight improvement since 2003. (4) Statistical Yearbook of Hefei in recent years shows that urban land use change and population growth, economic development and related policies are closely related. 1989-2007, Hefei, land-use change showed significantly reduced farmland, urban forests and other places, and the characteristics of urban construction land increased, and during the policy-driven, population growth, and economic development.

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CLC: > Agricultural Sciences > Forestry > Green construction > Landscaping > Urban greening
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