The study of growth factors of Yang Dipterocarpus alatus Roxb. using applied geographic information system for analyzing suitable areas in planting

Abstract

The objective of this research was to study the growth factors of Dipterocarpus alatus Roxb. by applying a landscaping system to analyze the suitable area for growth. The exploration would take place in the northeastern Provinces of Roi-et, Khon Kaen, Mahasarakham, and Kalasin provinces for 19.30 million rai. The study was divided into two parts, firstly is to consider the factors to grow as the physical properties of soil, the soil fertility, the climate and the topography of the state. The plantation can be divided into 4 levels of suitable areas to plant the Dipterocarpus alatus Roxb. From the most appropriate to least appropriate areas to grow, analyzed data showed the area of around 4.09 million rai to be highly suitable, with 4.24 million rai to be moderately high and 9.74 million rai to be moderately low and 1.23 million rai to be Least suitable area for the plantation. Moreover, the field research on two-year-old Dipterocarpus alatus Roxb. was done in 9 plots. Also rating the plots from the most to least suitable area. The outcome was found that only 1 plot was extremely suitable,6 plots were moderately suitable and 2 other plots were the least suitable. The average values for diameter at breast level were 2.43, 2.14 and 1.94 centimeters in that order. The average values for height of the plant were 2.92, 2.59 and 2.48 meters tall for the above-ground biomass were approximately 1.52, 1.06 and 0.84 kilograms, respectively. These results indicate that the four indicators inclined to be the fieldwork appropriately.