MỘT SỐ ĐẶC ĐIỂM TRẠNG THÁI RỪNG THƯỜNG XANH TRÊN ĐẤT THẤP TẠI CÁC KHU RỪNG ĐẶC DỤNG TỈNH THANH HÓA

Abstract

In this study, the method of silvicultural investigation at the positioning plots was applied in order to determine the compositions and biodiversities of flora in the special-use forests in Thanh Hoa province. The results show that Xuan Lien Nature Reserve (NR) has prominent tree growth indicators; the average index of the soaring height (H_vn) is 14.3 m, the height under branches (H_dc) is 9.11 m, the diameter (D_1.3) is 22.83 cm, the density of tree layer (N) is 475 trees/ha, and the canopy cover of the tree layer is about 85%. Pu Luong Nature Reserve has identifed the lowest tree growth index with H_tb = 11.88 m, H_dc = 8.08 m, D_1.3 = 20.05 cm, N = 370 trees /ha, and the canopy cover of the tree layer is about 72%, respectively. The highest Shannon-Weaver diversity index is 2.8, which belongs to Ben En National Park, followed by Pu Hu Nature Reserve, Xuan Lien Nature Reserve and Pu Luong Nature Reserve, respectively.