Natural Regeneration of Native Plant Species in Restoration Forest by Eucalyptus camaldulensis at Khun Han Plantation, Si Sa Ket Province
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Abstract
The study of natural regeneration of native plant species in reforestation forest after planting Eucalyptus camaldulensis in Khun Han plantation, Si Sa Ket Province, were conducted in 2018. The objectives was to study on the species composition and natural regeneration of native plant species after planting Eucalyptus camaldulensis for 30 years. The sample plots, 20 m x 50 m, were established in following site; natural forest, NF (2 plots) and restoration forest after planting Eucalyptus camaldulensis, RF (3 plots). All trees with diameter at breast height (DBH) larger than 4.5 cm were measured for their girth and identified. Saplings and seedlings in each plot were also counted. In addition, importance value index, species diversity and similarity index between plots were also calculated to infer about forest regeneration process.
The results showed a total of 24 families, 36 genera and 39 species of trees were found in the study areas. The RF plots had 34 tree species with the tree density of 1,813 individual.ha-1 and the basal area of 22.60 m2.ha-1. The NF plots had 18 tree species with the tree density of 670 individual.ha-1 and basal area of 19.02 m2.ha-1. Based on the diameter class distribution pattern in RF, the negative exponential growth form was detected in this sites similarly to some dominant native species in RF, indicating that the forest regeneration was in the normal natural condition. In contrast, the fast growing Eucalyptus camaldulensis had the polynomials growth form, indicating that the low ability of the trees regenerate. The similarity index showed that the species composition were more than 50% similar between the RF and NF for the tree and sapling stages, while the similarity between RF and NF was smallest in the seedling stages, probably due to high number of pioneer species. Thus, the forest restoration program should concern the species with high amplitude of tolerance and suitable to the restoration site. Some fast growing exotic tree species can support the native tree regeneration and reduced successional time for a degraded forest into a climax forest.
Article Details
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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