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PU-GEC

Peri-urbanization and Global Environmental Change

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Land Cover Change

Last Updated: 2009-05-15

The 1971 land cover map is developed by the Aerial Survey Office, Forestry Bureau, Council of Agriculture. The land cover maps from 1990 and 2006 were interpreted from SPOT images. These maps show a clear pattern of increased urban sprawl extending both from urban centers to nearby agricultural areas and along major transportation corridors.

1971 Land Cover Map

(Source: Aerial Survey Office, Forestry Bureau, Council of Agriculture, 1971)

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1990 Land Cover Map

(resulting from interpreting SPOT image, 1990)

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2006 Land Cover Map

(resulting from interpreting SPOT image, 2006)

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The Taipei-Taoyuan area was dominated by forests (¡Ö60%) in 1990. Built-up lands were centered on Taipei city, spreading fragmentarily into the northern areas of the TaHan River, and covered about 678.16 km2 (18.54%). The 2006 classification map reveals that the major type of land use in 2006 was still forests, covering 2124.79 km2. Notably, however, built-up lands amounted to 1071.43 km2 increasing by nearly 400 km2 over the past sixteen years.

             Land use statistics 1990 and 2006

 

1990

2006

Area (km2)

Percentage

Area (km2)

Percentage

Built-up land

678.16

18.54%

1071.43

29.29%

Agricultural/open field

480.25

13.13%

319.61

8.74%

Forests

2262.06

61.83%

2124.79

58.10%

Water body

238.19

6.51%

141.56

3.87%

Total

3658.66

100.00%

3657.39

100.00%

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Compared the land cover in 1971 with the interpreted land cover for 2006 in the Taipei-Taoyuan area, the change from agriculture/open field to built-up areas is the main land cover change. Predictably, places with a significant amount of agricultural lands near fast-growing urban areas experienced the highest rates of agricultural land conversion. Over 648.13 km2 of the land cover, including forests and agriculture/open field, were converted to built-up areas. Apparently, the rate of land converted from rural to urban use increased faster than population growth. In the Taipei-Taoyuan area, while population grew by 44.26% from 1971 to 2006, built-up lands increased 130%.

             Transition matrix of land cover from 1971 to 2006

1971~2006

Areas (km2)

Forests ¡÷ built¡Vup land

294.83

Agriculture/open field ¡÷ built-up land

353.30

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The Map of Land Cover Change between 1971 and 2006

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Landscape metrics for 1971, 1990, and 2006 for study region are shown as following curve charts. The increase in TA of built-up areas and decreased values for agricultural/open field areas show that substantial urban growth has occurred in the Taipei¡VTaoyuan area, particularly during the period from 1990 to 2006. NP indicates that the fragmentation of built-up areas was more obvious than for agricultural/open fields in 1971. Fragmentation of both of these land cover classes increased in 1990 and lessen in 2006. This was due to ongoing conversion of agricultural lands resulting in smaller patches of built-up areas being combined into larger patches and therefore producing a decrease in the number of urban patches. CI shows that the patches in 2006 were more aggregated than in 1971 and 1990. A comparison of LPI of built-up areas with agricultural/open fields shows that urban areas have become the dominant land use/land cover in the Taipei¡VTaoyuan area. Together with the loss of agricultural lands and decrease in MPA, the decrease of LPI of agricultural fields from 2.76 in 1971 to 0.17 in 2006 indicates a loss of agricultural landscape in the study region. Changes in AWMSI and AWMPFDI indicate that the physical shapes within built-up areas are becoming more irregular. Conversely, agricultural/open fields have become more regular in shape. The reasons for these changes in pattern are urban leapfrog development resulting from both the peri-urbanization effects of Taipei and the minimum area requirement for agricultural lands in study area.

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Landscape metrics: 1971¡V2006

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[Physical Environment] [Socioeconomic] [Land Cover Change] [Ecosystem Service Evaluation]