Changing of land use pattern in Songkhla lake basin area in 12 years (1982-1994)
1996
Prachan Meeboon
Study on land use change of Songkhla Lake Basin during a 12 year period (1982-1994) aims to analyze the change in land use and factors affecting the change within the framework of watershed classes 1, 2, 3, 4 and 5 in the period. The analysis includes drafting maps based on land use and forest area data of the years 1982, 1988 and 1994 and overlaying these maps on watershed classification map of the Songkhla Lake Basin to determine the change of land use in the area using data of 1982 as bases. Trend of land use change was analyzed using Time Series method, and relationship among land use types was determined by Multiple Regression and Stepwise Regression. The following ratios of average areas for five land use types in the Songkhla Lake Basin inclusive of urban area, agricultural area, forest area, water source area and idle lands during 1982-1994. Watershed class 1 area consists of 1 percent urban, 70 percent agricultural and 29 percent forested without water source or idle lands. Watershed class 2 area consists of 68 percent agricultural and 32 percent forested with no other types of land use. Watershed class 3 area consists of 1 percent urban; 69 percent agricultural and 30 percent forested without other types of land use. Watershed class 4 area consists of 2 percent urban, 96 percent agricultural and 2 percent forested, without other two types. And, watershed class 5 consists of 7 percent urban, 64 percent agricultural, 7 percent forested with 21 percent of water source area and one percent of idle lands. The change of land use in all five watershed classes of the Songkhla Lake Basin does not show any consistent trend. Therefore, it appears necessary to define a proper direction on land use of the basin based on potential of each area according to soil and water conservation principles so that it would enhance the sustainable use and development of the basin in the future.
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