惠蓀林場921地震崩塌地分布分析與復育探討

Analysis and Restoration of Landslide in HuiSun Forest Experimental Station after 921 Chi-Chi Earthquake

921集集大地震於惠蓀林場造成多處崩塌，崩塌的發生嚴重地干擾森林生態系功能，本研究利用遙航測技術與地理資訊系統建構之資料庫的資料，探討崩塌地的空間特性及林地分級，以研擬崩塌地復育措施。本研究結果顯示：（1）以數位航空照片判釋惠蓀林場崩塌地，經計算結果，數位航空照片判釋崩塌面積有549.16ha，佔惠蓀林場總面積7.35%，崩塌嵌塊體有2,618且1ha以下者有2,057處。（2）研究分析河流、道路與崩塌地的關係，發現崩塌發生區域，面積大小明顯地與河流與道路有闕，愈接近河流及道路，崩塌面積愈大，但與坡向無關。（3）針對河流、道路、人為活動區、崩塌地面積區分崩塌地優先治理順序，依林務局（1995）林地分級辦法將坡度級分成六級、土壤級分成五級，交叉運算得到五級的林地地位分級。並以地位級作為崩塌植群復育措施的依據。 The 921 Chi-Chi earthquake caused a large area of slide in Huisun Forest Experimental Station, and the slide disturbed the function of original forest ecosystem. Multi-scale forest ecosystem management database were developed by geographic information system (GIS) and Remote Sensing (RS). Slide area were interpreted with orthogonal colored aerial photos, and then we explore the spatial characteristics of slide area and land classification and draw up the recovery step in slide. The research results showed as follows: (1) To interpret the slide areas of digital colored aerial photos of Huisun Experimental Forest Station. The results showed that the slide area of digital aerial photo is 549.16 ha, which is 7.35% area of Huisun Experimental Forest Station, the number of slide area are 2,618, but there are 2057 which area are under 1ha. (2) Analysing the relationship between the river, road and slide, we found that the relationship between the slide areas, road and river are obviously. The closer to the river and road, the larger the slide areas are. (3) For developing methods of recording the slide area, we classify the slope into six classes and the soil types into five classes, then intersection calculation were used to group into five forest classes. The suggestions of community restoration were presented, also.

The 921 Chi-Chi earthquake caused a large area of slide in Huisun Forest Experimental Station, and the slide disturbed the function of original forest ecosystem. Multi-scale forest ecosystem management database were developed by geographic information system (GIS) and Remote Sensing (RS). Slide area were interpreted with orthogonal colored aerial photos, and then we explore the spatial characteristics of slide area and land classification and draw up the recovery step in slide. The research results showed as follows: (1) To interpret the slide areas of digital colored aerial photos of Huisun Experimental Forest Station. The results showed that the slide area of digital aerial photo is 549.16 ha, which is 7.35% area of Huisun Experimental Forest Station, the number of slide area are 2,618, but there are 2057 which area are under 1ha. (2) Analysing the relationship between the river, road and slide, we found that the relationship between the slide areas, road and river are obviously. The closer to the river and road, the larger the slide areas are. (3) For developing methods of recording the slide area, we classify the slope into six classes and the soil types into five classes, then intersection calculation were used to group into five forest classes. The suggestions of community restoration were presented, also.