Plant Diversity in Nam Liab Watershed Management Unit, Thung Chang District, Nan Province, Thailand
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Abstract
Forest restoration in the Nam Liab Watershed Management Unit has increased the diversity of plant species on a continuing basis. This study explored and classified plant diversity in the Nam Liab Watershed Management Unit, Thung Chang district, Nan province, Thailand based on line transect plot sampling across the altitudinal range in the study area. All collected data were analyzed using the importance value index (IVI) and the Shannon-Weiner index (H') for dominant species and diversity grading, respectively. Based on the results for the study area, there were 93 species in 82 genera and 59 families of plants. Based on IVI, the top-three tree species were Pterocarpus macrocarpus, Shorea obtusa and Dalbergia dongnaiensis, while the top-three sapling species were Eurya acuminata, Croton persimilis and Macaranga denticulata and the top-three seedling species were Croton persimilis, Eurya acuminata and Castanopsis argyrophylla. Furthermore, the top-three undergrowth species were Lygodium polystachyum, Chromolaena odorata and Dioscorea birmanica. Bamboo were represented by Gigantochloa albociliata and Bambusa nutans. The H’ values for the tree, sapling, seedling, undergrowth and bamboo species were 3.53, 2.57, 2.73, 2.35 and 0.47, respectively, indicating that the forest restoration activities produced successful succession with greater diversity of tree stage species. However, the sapling, seedling undergrowth and bamboo species had been affected by forest fires and cattle grazing that had resulted in poor survival rates for saplings and seedlings. The results should provide useful information for forest restoration management in setting community rules for awareness and conservation in the upper watershed areas. In addition, such action will provide an appropriate response to the policy of the Department of National Parks, Wildlife and Plant Conservation to not only integrate conservation but to also obtain more suitable outputs and outcomes for the Nam Liab Watershed Management Unit.
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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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