Seedling Communities of Mixed Deciduous and Dry Dipterocarp Forests under the Invasion of Chromolaena odorata in Nam Tok Tat Sai Rung Forest Park, Chiang Rai Province
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Abstract
This study aimed to quantitatively characterize the seedling community in two forest types: mixed deciduous forests (MDF) and deciduous dipterocarp forests (DDF), under invasion by Chromolaena odorata. Seedling community characteristics were recorded from 60 temporary sampling plots of size 1 m x 1 m, which were systematically located in Nam Tok Tat Sai Rung Forest Park, Chiang Rai province. The study identified 24 and 17 species seedling tree species in the areas of MDF and DDF invaded by C. odorata, respectively. These species were from 23 genera and 16 families and 16 genera and 13 families of MDF and DDF, respectively. The seedling tree densities were 16,538 and 5,000 stems/ha, respectively. It was also not found that almost all the areas in MDF and DDF were invaded by C. odorata. The identified seedlings were from 17 species, 16 genera, 13 families, and 8 species, 7 genera, and 6 families in the two forest types, respectively, with seedling densities of 12,884 and 10,576 stems/ha, respectively. Comparing the biomass of the invaded areas, it was found that the highest biomass was in the community of C. odorata, followed by the understory vegetation and tree seedlings, respectively. Conversely, in the non-invaded areas of MDF, the seedling tree biomass was higher than in the community of C. Odorata, which was different from that in the DDF. However, the biomass of the understory vegetation in both MDF and DDF was lower than that of the community of C. odorata. The invasion of C. odorata had a significant impact on tree species such as Shorea obtusa, Shorea siamensis, Syzygium oblatum, and Castanopsis acuminatissima. It was found that very few seedlings could establish in the dense growth of C. odorata areas compared to the non-invaded areas. Therefore, sustainable management practices should consider establishing structural tree planting to enhance the chances of successfully establishing native tree species with high importance value index, as well as studying tree species that are resistant to the invasion of such non-native species. These measures will help increase the appropriate quantity of tree seedlings to maintain the ecological system of specific forest communities. Furthermore, raising awareness and disseminating knowledge about the impact of invasive species among the future stakeholders is crucial to ensure a sustainable use of the area.
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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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