Xây dựng các hàm sản lượng và phân tích biến động sản lượng gỗ của rừng Keo lai (Acacia hybrid) theo những lập địa khác nhau tại tỉnh Đồng Nai

Mục tiêu của nghiên cứu này là phân tích sự biến đổi của sản sản lượng rừng Keo lai theo tuổi và những lập địa khác nhau. Đặc điểm của rừng Keo lai từ tuổi 2 đến 10 đã được thu thập từ 50 ô tiêu chuẩn với kích thước 500 m2 . Lập địa của rừng Keo lai đã được đánh giá theo 5 cấp chỉ số lập địa từ I đến V. | 22 Trường Đại học Nông Lâm TP. Hồ Chí Minh Developing production models and analyzing timber production variation of Acacia hybrid plantations on different sites in Dong Nai province Them V. Nguyen Forest Science and Technology Association of Ho Chi Minh City Ho Chi Minh City Vietnam ARTICLE INFO ABSTRACT Research Paper The objective of this study was to analyze the variation in timber production in Acacia hybrid plantations based on age and different Received June 15 2023 sites. Data were collected from 50 standard plots 25 20 m Revised August 01 2023 of different plantation ages ranging from 2 to 10 years. The site Accepted August 16 2023 condition of Acacia hybrid plantations were assessed using 5 site indices from I to V. Site index functions were developed from the Keywords height of 50 dominant trees at the age of 10. Production functions Acacia hybrid plantation at the average tree level were constructed using data from 50 trees Forest site at age 10. The research results showed that 5 site indices of Acacia Production function hybrid plantations had values of 28 25 22 19 amp 16 m respectively. Timber production of Acacia hybrid plantations has changed Site index markedly with age and site indices. The age of 2 could be the time Timber growth when diameter and height of Acacia hybrid plantations change Corresponding author from the fast growing stage to the slow growing stage. By the age of 5 the timber volume of Acacia hybrid plantations changes from the Nguyen Van Them fast growing stage to the slow growing stage. The average timber Email productivity of 10 year old Acacia hybrid plantations on 5 site nvthem2009@ indices from I đến V was amp m3 ha per year respectively. The age of quantitative maturity of Acacia hybrid plantations on 5 site indices was 9 years of age. Cited as Nguyen T. V. 2023 . Developing production models and analyzing timber production variation of Acacia hybrid plantations on different sites in Dong .