Forest Dynamics and Carbon Stock over a 10-year Period at Lam Nam Nan National Park in Uttaradit and Phrae Provinces
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Abstract
This research aimed to monitor the changes in forest dynamics such as species diversity, density of trees, sapling and seedling stages, tree volume, periodic annual increment (PAI), biomass, and carbon dioxide absorption in each forest type. Twenty-three concentric sample plots were established in 2010 for tree census and were measured again in 2020. The four forest types were classified as mixed deciduous forest (MDF), dry evergreen forest (DEF), dry dipterocarp forest (DDF), and hill evergreen forest (HEF). The number of plots in each forest type were 17, 3, 2, and 1. The tree density decreased from 73.04±67.89 tree/rai to 72.77±96.54 tree/rai; sapling decreased from 7.03±12.90 tree/rai to 3.27±1.71 tree/rai and seedling decreased from 17.32±5.39 to 7.93±8.96 tree/rai. The tree volume however increased from 12.28±7.04 to 13.81±6.55 m3/rai. A paired-samples t-test was used to compare the change in tree volume between the two years and indicated that the change was non-significant. In terms of stand volume growth, the gross growth increased by 2.92±3.14 m3/rai. The net growth increased by 1.51±4.02 m3/rai. The biomass increased from 10.23±6.45 tons/rai to 13.25±3.36 tons/rai. The periodic annual increment in biomass was 0.308±0.750 tons/rai/year. The total carbon dioxide absorption by each forest type was 3,348,865.83 tC and carbon dioxide sequestration was 12,279,895.09 tCO2eq. Forest type with the highest carbon dioxide sequestration potential was found to be mixed deciduous forest followed by dry evergreen forest, deciduous dipterocarp forest, and hill evergreen forest.
Keywords: Biomass; Carbon stock; Dynamics; Growth; Periodic annual increment
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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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