Vegetation Structural Characteristics and Influence of some Physical Environmental Factors in Phu Kao–Phu Phan Kham National Park, Nong Bua Lamphu Province, Thailand
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Abstract
The study of vegetation structural characteristics is important for national park management. This study investigated the vegetation structural characteristics and the influence of some physical environmental factors on the distribution of tree species in Phu Kao–Phu Phan Kham National Park, Nong Bua Lamphu province, Thailand. In total, 30 purposive sample plots (each 20 m x 20 m) were established. Data on tree species composition and some physical environmental factors were collected and used to analyze vegetation structural characteristics based on cluster analysis and their relationships with environmental factors. Based on the results, there were 79 species in 65 genera from 30 families, with the species diversity index being 3.63. The cluster analysis identified 3 sub–communities. The first was deciduous dipterocarp forest, consisting of 38 species and 35 genera from 17 families, with the species diversity index being 2.82. The dominant species, such as Dipterocarpus obtusifolius, Gluta usitata and Pterocarpus macrocarpus, were positively influenced by the altitude above mean sea level (m). The second sub–community was mixed deciduous forest, consisting of 52 species and 47 genera from 24 families, with the species diversity index being 3.28. The dominant species, such as Xylia xylocarpa, Pterocarpus macrocarpus, and Lannea coromandelica, were positively influenced by the temperature (oC). The third community was dry evergreen forest, consisting of 39 species and 36 genera from 20 families, with the species diversity index being 2.93. The dominant species, such as Lagerstroemia duperreana, Cratoxylum formosum and Dipterocarpus turbinatus, were positively influenced by the rainfall (mm) and slope (%). Overall, based on the results, the Phu Kao–Phu Phan Kham National Park included diverse plant communities that had been determined by differences in physical environmental factors. Therefore, in zoning the management area, vegetation structural characteristics and physical environmental factors should be considered as important criteria. Further study should investigate the influence of soil factors on the occurrence of tree communities, which may provide additional information to more clearly explain the occurrence of plant communities.
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ข้าพเจ้าและผู้เขียนร่วม (ถ้ามี) ขอรับรองว่า ต้นฉบับที่เสนอมานี้ยังไม่เคยได้รับการตีพิมพ์และไม่ได้อยู่ในระหว่างกระบวนการพิจารณาตีพิมพ์ลงในวารสารหรือสิ่งตีพิมพ์อื่นใด ข้าพเจ้าและผู้เขียนร่วม (ถ้ามี) ยอมรับหลักเกณฑ์และเงื่อนไขการพิจารณาต้นฉบับ ทั้งยินยอมให้กองบรรณาธิการมีสิทธิ์พิจารณาและตรวจแก้ต้นฉบับได้ตามที่เห็นสมควร พร้อมนี้ขอมอบลิขสิทธิ์ผลงานที่ได้รับการตีพิมพ์ให้แก่วารสารวนศาสตร์ คณะวนศาสตร์ มหาวิทยาลัยเกษตรศาสตร์ กรณีมีการฟ้องร้องเรื่องการละเมิดลิขสิทธิ์เกี่ยวกับภาพ กราฟ ข้อความส่วนใดส่วนหนึ่ง หรือ ข้อคิดเห็นที่ปรากฏในผลงาน ให้เป็นความรับผิดชอบของข้าพเจ้าและผู้เขียนร่วม (ถ้ามี) แต่เพียงฝ่ายเดียว และหากข้าพเจ้าและผู้เขียนร่วม (ถ้ามี) ประสงค์ถอนบทความในระหว่างกระบวนการพิจารณาของทางวารสาร ข้าพเจ้าและผู้เขียนร่วม (ถ้ามี) ยินดีรับผิดชอบค่าใช้จ่ายทั้งหมดที่เกิดขึ้นในกระบวนการพิจารณาบทความนั้น”
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