NGHIÊN CỨU MỘT SỐ ĐẶC ĐIỂM LÂM HỌC LOÀI THIẾT SAM GIẢ LÁ NGẮN (PSEUDOTSUGA BREVIFOLIA W. C CHENG & L. K. FU, 1975) TẠI HUYỆN NGUYÊN BÌNH, TỈNH CAO BẰNG

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Thông tin xuất bản: Tạp chí Khoa học và Công nghệ - Đại học Thái Nguyên, 2020

Mô tả vật lý: tr.24-30

Bộ sưu tập: Báo, Tạp chí

ID: 292359

Thêm vào giỏ Liên kết toàn văn

Nghiên cứu nhằm xác định được một số đặc điểm cấu trúc và tái sinh rừng có loài Thiết sam giả lá ngắn phân bố. Nghiên cứu được thực hiện tại 2 xã của huyện Nguyên Bình, tỉnh Cao Bằng, với 30 ô tiêu chuẩn có diện tích 200 m2/ô, 120 ô dạng bản với diện tích 25 m2/ô, nghiên cứu được thực hiện theo phương pháp điều tra lâm học. Kết quả cho thấy: có từ 3-5 loài tham gia vào công thức tổ thành rừng, Thiết sam giả lá ngắn luôn là loài cây chiếm ưu thế, có chỉ số IVI% cao nhất. Mật độ rừng biến động từ 518 đến 612 cây/ha, Thiết sam giả lá ngắn có mật độ cao nhất từ 265 - 377 cây/ha. Có từ 5-6 loài tham gia vào công thức tổ thành tái sinh rừng, loài Thiết sam giả lá ngắn chiếm tỷ lệ tổ thành cao nhất từ 27,81% - 36,29%. Mật độ cây tái sinh loài Thiết sam giả lá ngắn từ 362 - 529 cây/ha. Thiết sam giả lá ngắn tái sinh chủ yếu có chất lượng tốt và trung bình. Tỷ lệ cây tái sinh từ hạt là chủ yếu, tập trung ở cấp chiều cao <
50 cm và >
100 cm. Kết quả nghiên cứu là cơ sở để đề xuất các giải pháp bảo tồn và phát triển loài quý hiếm này.The study was designed to identify some structural features and regeneration in which Pseudotsuga brevifolia was being distributed. The study was conducted in 2 communes of Nguyen Binh district, Cao Bang province, with 30 sample plots with the sample area are 200m2/plot, 120 plots with 25 m2/plot, the study was conducted by the silviculture investigated method. The results showed that: there were 3-5 species that involved in forest composition, Pseudotsuga brevifolia was living with state of being dominant in studied sample plots with IVi% index being the highest. Forest density varied from 518 to 612 stems/ha, Pseudotsuga brevifolia achieved the highest of density with number of stems being from 265 to 377 stems/ha. There are 5-6 species that involved in forest regeneration composition, Pseudotsuga brevifolia achieved the highest of the rate composition of 27.81% - 36.29%. The density of species P. brevifolia regeneration is from 362 to 529 stems per hectare. The quality of regeneration Pseudotsuga brevifolia is mainly good and medium. The rate of regeneration trees from seeds obtains. Mostly is at height levels <
50 cm and>
100 cm. The research results are the basis for proposing solutions to preserve and develop this rare species.

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