Geography Reference
In-Depth Information
Table 6.3 The area precentage and the changes of main land use (%) in Beijing-Tianjin-
Tangshan Metropoliatn area, 1995-2005
Year/period
Cultivated land
Forestry area
Grassland
Water
Built-up area
Unused land
1995
48.48
24.59
6.32
5.54
0.92
14.14
2005
47.50
22.45
6.74
5.08
0.76
17.48
Change a
-0.10
-0.21
0.04
-0.05
-0.02
0.33
10 Þ ,
a
Note
represents the change rate calculated with the following equation:
A 2005
i
A 1995
i
where A 2005
i
means the area proportion of land use type i in 2005, A 1995
i
means the area proportion
of land use type i in 1995
Urban expansion is the main driving factor of the shrinkage of cultivated land and
forests. The socioeconomic development and geographical factors, such as the
population
growth,
policy,
and
economic
development,
all
affect
the
urban
expansion and subsequent landscape changes.
6.1.2.2 Spatiotemporal Dynamics of Temperature and Precipitation
in the Great Beijing Area during 1995-2005
There was slight temperature change in the Beijing-Tianjin-Tanghsan Metropoli-
tan area from 1995 to 2005 (Fig. 6.1 ). Overall, temperature showed an increasing
trend in most part of the study area, especially around the metropolitan Beijing and
in the costal metropolitan area of Tianjin and Tangshan, with an average
increasing rate of 0.023 C/year. However, temperature has decreased to some
degree in northeast and northwest part of the study area. The regions that con-
verted from other land use types into cities has shown relatively higher temper-
ature rise, indicating that urbanization has some influence on temperature in the
Great Beijing area. At the same time, precipitation showed an increasing trend in
metropolitan Tangshan and northeast part of Beijing Metropolitan, while it showed
a downward trend in the west and south part of Beijing. According to the results
mentioned above, it can be concluded that the process of urbanization has affected
regional temperature and precipitation to a certain extent in the Great Beijing area.
6.1.2.3 Urban Area Change from 2010 to 2030
There will be obvious conversion from other land use types to urban area in Great
Beijing area during 2010-2030 (Fig. 6.2 ). Urban area in this region would con-
tinue to increase during 2010-2030, and the newly increased urban land will
mainly concentrate in the regions around downtown of Beijing and Tianjin City.
Land use conversion mainly results from the joint effects of both the internal
factors and external factors such as terrain, traffic, economic factors, cultural
tradition, and behaviors of the government officials.
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