Application of Geographic Information System for Magnolia sirindhorniae Noot.& Chalermglin Forest Database Lopburi province

Abstract

     The objectives of this research were to 1) prepare a database of Magnolia sirindhorniae Noot. & Chalermglin forest using Geographic Information technology, 2) to study forest community and distribution of Magnolia sirindhorniae Noot. & Chalermglin, collected data with GPS. Explore the location of Magnolia sirindhorniae Noot. & Chalermglin, measured diameter at breast height from 2 centimeters to 1.30 meters and make database of Magnolia sirindhorniae Noot. & Chalermglin forest with Arc Gis 10.4, then, the used database to study forest community and distribution by finding Density, Grith at breast height, Basal area and Volume of wood. Results found that database of Magnolia sirindhorniae Noot. & Chalermglin forest has an area of 139,752 Rai of 4 zones. The database contains data about the location of trees, growth, Basal area diameter at breast height, the volume of wood, and height of each Magnolia sirindhorniae Noot. & Chalermglin. The results of the community forest showed that in 2015, the density was 1.56 trees/Rai, the volume of wood was 3.95 cube meters, Basal area was 254.43 square meters, while in 2018, the density was 0.62 tree/Rai, the volume of wood was 3.39 cube meters, Basal area was 208.46 square meters. Comparing 2015 and 2018, the number of Magnolia sirindhorniae Noot. & Chalermglin decreased by 60 percent, and the volume of wood and Basal area decreased by 40 and 82 percent, respectively. For distribution, they distributed in group type in both years.