Đặc điểm cấu trúc và đa dạng loài cây gố của ưu hợp Cáng lò (Betula alnoides Buch - Ham) trong các trạng thái rừng tại vườn quốc gia Tà Đùng

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Tác giả: Phương Anh Kiều, Thành Trung Nguyễn, Thị Luận Phạm, Văn Hường Phạm

Ngôn ngữ: vie

Ký hiệu phân loại: 578.73 Natural history of organisms and related subjects

Thông tin xuất bản: Khoa học và Công nghệ Lâm nghiệp, 2020

Mô tả vật lý: 37-46

Bộ sưu tập: Metadata

ID: 495854

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Đối tượng nghiên cứu là ưu hợp Cáng lò (Betula alnoides Buch - Ham) ở 3 trạng thái rừng thuộc kiểu rừng kín cây lá rộng thường xanh và rừng hỗn giao cây lá rộng cây lá kim mưa ẩm nhiệt đới thuộc Vườn quốc gia Tà Đùng. Thông qua điều tra, phân tích đặc điểm về thành phần loài, kết cấu rừng, đa dạng cây gỗ trên 18 OTC có diện tích 0,1 ha, kết quả nghiên cứu cho thấy: Mật độ cây gỗ trong 3 trạng thái rừng giao động từ 562 cây/ha đến 895cây/ha
trữ lượng biến động từ 92,62 m3/ha đến 270,66 m3/ha
số loài cây biến động từ 69 đến 93 loài
số loài cây tham gia vào công thức tổ thành từ 5 đến 6 loài. Cáng lò chiếm tỷ trọng cao, ở trạng thái rừng giàu chiếm 19,46%, rừng trung bình là 18,52%, ở rừng nghèo là 17,95% và là loài cây ưu thế. Đối với những quần thụ trong ba trạng thái rừng có phân bố N/D phù hợp với hàm phân bố mũ giảm, phân bố N/H phù hợp với phân bố khoảng cách. Chỉ số dMargalef ở rừng nghèo thấp hơn rừng trung bình, cao nhất ở rừng giàu
chỉ số chỉ số J' cao nhất ở rừng nghèo và thấp nhất ở rừng giàu. Mức độ tích lũy số loài trong các quần xã thực vật có sự khác nhau không đáng kể. Kết cấu quần thụ của 3 trạng thái có tính quy luật, ổn định và xu hướng phục hồi khá tốt, độ đa dạng, phong phú về loài cây gỗ ở 3 trạng thái rừng khá cao. Cáng lò là loài cây ưu thế và đóng vai trò là loài kiến thiết trong quần xã.The object of the study was dominant Betula alnoides Buch - Ham at3 forest states, belonging to evergreen broadleaf closed forest and tropical moist mixed forest of broadleaf and needle leaf in Ta Dung National Park. Through the investigation and analysis of features of species composition, forest structure, and wooden tree diversity within 18 standard plots with an area of 0.1 ha, the research results showed that: concentration of trees in 3 forest types changed from 562 trees/ha to 895 trees/ha
productivity varied from 92.62 m3/ha to 270.66 mVha. The number of trees ranged from 69 to 93 species and got involved in the species formula from 5 to 6. Betula alnoides was the predominant plant, accounting for a high proportion with 19.46%, 18.52%, 17.95% at rich, medium and poor forests respectively. In the 3 forest states, stands had N/D distribution in accordance with the exponential reduction function, the N/H distribution was consistent with the distance distribution. The dMargaief indexes at poor forests were lower than that of medium forests and highest when it comes to rich forests. On the contrary. Pielou (J') index was the highest in poor forests and lowest in rich forests. The accumulation level of species in the plant communities had an insignificant difference. The forest structure of the 3 states was regular, stable and had a promising recovery trend. The diversity and richness of tree species in 3 forest states were quite high. The Betula alnoides was considered to be the dominant plant species and played a crucial role as a construction species in the community.

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