อิทธิพลของภูมิอากาศเฉพาะแห่งในแนวดิ่งที่มีต่อชุมชีพไลเคนบนเปลือกไม้ ในป่าดิบชื้น ณ อุยานแห่งชาติเขาใหญ่ Influence of vertical stratification of microclimate on corticolus lichen communities in the tropical rain forest at Khao Yai National Park เวชศาสตร์ พลเยี่ยม, วาสนา เชื้อสุข, และ กัณฑรีย์ บุญประกอบ

Lichen communities vary markedly along vertical stratification of tree trunk in the forest due to influence of canopy which affect climate underneath them. The objectives of this study are to observe the diversity of lichens caused by gradient of microclimate under the canopy, and to compare lichen distribution on different strata. This information is essential for using lichen as indicator of climatic condition. The study was performed to test the hypothesis that species composition of lichens increases from ground to canopy correspond to light intensity. Monitoring of microclimate together with study of lichens on quadrats of 10 x 50 cm at 30, 18 and 1.5 meters at the canopy, middle and base of a trunk of Dipterocarpus gracilis were preformed. Lichens at these levels composed of 18, 12 and 4 species with a total of 29 species. Diurnal variation of climate was greatest at the canopy level. Light intensity as high as 1300 µmol m-2s-1 was recorded at 9:30 hours, whereas maximum and minimum temperature of 28.7 °C and 21.5 °C were measured at 13:20, and 5:05 hours. Relative humidity over 80 % was often found from 18:30 to 8:40 hours, with the highest value of 96% was recorded at 5:00 hours, contrasting with noontime low of 60%.