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Tác giả: Mạnh Hưng Bùi, Thúy Nga Đỗ, Bùi Thiện Nhân Nguyễn, Duy Nguyễn, Viết Xuân Nguyễn, Thị Tuyết Mai Tăng, Lại Bảo Châu Trần, Tấn Phương Vũ

Ngôn ngữ: vie; Vie

Ký hiệu phân loại: 634.9 Forestry

Thông tin xuất bản: Tạp chí nông nghiệp và phát triển nông thôn, Tạp chí Khoa học Trường Đại học Sư phạm Thành phố Hồ Chí Minh , 20122020

Mô tả vật lý: 81-87

Bộ sưu tập: Metadata

ID: 482573

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Recent years, the development of national reports on greenhouse gases (GHGs) emissions is compulsory for nations that have been involving in as a member of United Nations Framework Convention on Climate Change (UNFCCC). Forest biomass, which is known as an important factor in GHGs inventory programs, can be calculated by different methods. One of the most common methods recently used are the use of biomass expansion factor (BEF) to estimate the forest biomass. Nowadays, in Vietnam, there have been few researches on BEFs, which are used to convert wood volume to forest biomass. The researches have not yet met the requirement on biomass estimation of GHGs inventory programs at national levels. The purposes of this study were to calculate BEFs and develop allometric equations which were based on the data of destructive trees between BEFs and DBHs of tree individuals of some popular plantations including Acacia hybrid, Acacia mangiwn, Pinus merkusii and Pinus massoniana. Research results showed that there was a gradually declining trend of BEFs by ages and that the higher the stand ages were, the more stable the BEFs' values became. The highest mean biomass expansion factor, which showed the lowest value (0.889 Mg/cm3) in Acacia hybrid plantations, of Pinus merkusii ones wass 1.314 Mg/cm3. Furthermore, research results also showed that there were significant differences between BEFs at different age classes of the same plantations (Sig 0.05). Results on the developed allometric equations between BEF and DBH showed that fluctuations in correlation levels of different species were true and depended on function types which were used to simulate the relationships between BEF and DBH. The established allometric equations statically existed and can be applied widely to calculate BEFs for a specific age of plantations.Bài viết xây dựng các dạng bài tập giúp học viên nước ngoài khắc phục những lỗi thường gặp khi học đại từ nhân xưng (ĐTNX) tiếng Việt, như: lỗi dùng ĐTNX không phù hợp, lỗi không xác định được các nghĩa của ĐTNX, lỗi không xác định được sắc thái biểu cảm của ĐTNX, lỗi không xác định được tính chất tương ứng của các cặp ĐTNX. Hệ thống bài tập này được xây dựng dựa trên cơ sở lí thuyết về lỗi và những lỗi thường gặp khi học ĐTNX tiếng Việt của người nước ngoài mà chúng tôi đã thu thập được thông qua quá trình thực hiện khảo sát bằng phiếu hỏi. Kết quả nghiên cứu đã chỉ ra lỗi là một phần tất yếu khi học một ngoại ngữ và các trường hợp lỗi khi học ĐTNX cũng không ngoại lệ. Các lỗi thường gặp khi học từ vựng ĐTNX tiếng Việt chủ yếu xuất phát từ thói quen dùng ngôn ngữ mẹ đẻ của người nước ngoài, sự phức tạp của nhóm ĐTNX trong tiếng Việt. Vì vậy, những dạng bài tập khắc phục các lỗi đã đề cập sẽ tạo điều kiện cho người học ghi nhớ những đặc điểm ngữ nghĩa, ngữ pháp của nhóm từ ĐTNX tiếng Việt.

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