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Land use/cover change and its drivers: a case in the watershed of Lake Kasumigaura, Japan

Author:
Takehiko Fukushima   Masae Takahashi   Bunkei Matsushita   Yoshinori Okanishi  


Journal:
Landscape and Ecological Engineering


Issue Date:
2007


Abstract(summary):

Land use/land cover (LULC) changes in the watershed (2,157 km(2)) of Lake Kasumigaura during 1979-1996 (Period-1: 1979-1990, Period-2: 1990-1996) were analyzed, and their socio-economic and biophysical drivers were compared using time-series, high-quality GIS datasets in order to examine the characteristics of a model forecasting the future LULC. The changes occurred over an area of more than 90 km(2) during the overall period at changing rates of 0.22% year(-1) in Period-1 and 0.25% year(-1) in Period-2. Forestland decreased most in both periods at changing rates of 0.45% year(-1) in Period-1 and 0.61 % year(-1) in Period-2. However. predominant changing patterns differed. i.e., from forest to golf course in Period-1 and from forest to artificial field in Period-2. Particularly in Period-2. a significant LULC change was observed in an area of high population increase on the edge of an already high-population area. Relationships examined among LULC change, population, and rate of population change suggested that the urbanized area was highly resistant to LULC change, and that such change was less frequent in areas of population decline. Statistical analyses indicated that the most influential drivers for total LULC changes were population in Period-1 and distance from the Tokyo Station in Period-2. Since the change potentials differed between the periods, we could not assume a stationary process for the corresponding drivers. Somewhat low S values (indices for demonstrability) show that LULC changes in the watershed of Lake Kasumigaura occurred rather randomly, probably resulting in fragmentation of the landscape.


Page:
21-31


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