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- Species-site Compatibility Analysis Using Pair-wise Ranking Approach...
Species-site Compatibility Analysis Using Pair-wise Ranking Approach with GIS for Logged-over Areas in Kraya Commune, Santuk District, Kampong Thom Province, Cambodia
Abstract:
The study characterized and evaluated the biophysical and socioeconomic conditions of the Kraya Commune; formulated and developed a model that would measure species-site compatibility to help guarantee the success of the reforestation program in the Commune; documented the criteria used and examined the consultative process with the various stakeholders in generating weights/ranks for their choice of reforestation species; and provided recommendations to policy makers and planners for the successful rehabilitation of the degraded forest areas.
Local people were interviewed to find out their perception of the reforestation program, preferred tree species to be planted, and the constraints that may be encountered. Focus group discussions (FGD) were also conducted for 20 representatives from the different villages in the commune regarding the pair-wise ranking method. The FGD also developed scales and weights on the various criteria for plant growth, and the constraints for the reforestation program using the pairwise comparison method. The ecological requirements of the preferred tree species and site characteristics were obtained from secondary data. Site characteristics and species requirements were matched using ArcView 3.2 GIS to analyze the speciessite compatibility for the top five preferred tree species; namely, Dipterocarpus alatus Roxb., Hopea odorata Roxb., Tarrietia javanica Bl., Pterocarpus macrocarpus Kurz, and Anisoptera cochinchinensis Pierre. The seed supply of these priority species was also determined by the local people.
In the Kraya Commune, tree species are mostly noncommercial class. The area has five soil types which are deep and acidic. It is flat to gently sloping with low elevation. Annual rainfall ranges from 1,400 to 1,800 mm. Most of the people in this commune are farmers. Forest resources are important source of their livelihood.
The relative weights showed that the priority tree species was 0.201. Soil depth and soil analysis accounted for 0.198 and 0.171, respectively. In addition, the relative weights of soil pH, slope, rainfall, elevation, and seed supply were 0.065, 0.022, 0.146, 0.033, and 0.164, respectively. In general, majority of the area was found highly compatible to all species except for T. javanica Bl.
The ecological requirements of tree species and site condition need further study.