ĐẶC ĐIỂM CẤU TRÚC RỪNG TỰ NHIÊN PHỤC HỒI TRẠNG THÁI IIIA1, IIIA2 TẠI VƯỜN QUỐC GIA BẾN EN, THANH HÓA

Abstract

Ben En National Park is the home to typical ecosystems of tropical forests, of which the restored natural forest ecosystem covers an area of 1,855.44 hectares, accounting for 15.8% of the total land area. There are forests of the Garden. Statistical results show that the high tree layer in forest status IIIA1 and IIIA2 has the diversity of the species participating in the composition formula, but there are no ecologically dominant species pants. The forest ecosystem is highly sustainable and adaptable to the environment as clearly shown in the high tree stratum according to the important index IV%. The number of tree species involved the composition formula is very low, only 3-4 species; the species that do not participate in the composition formula account for a high quantity (from 69 to 73 species). The average tree densities of 2 staties IIIA1 and IIIA2 are 334 trees/ha and 400 trees/ha, the forest reserves are 91.01 m 3 /ha and 129.43 m3 /ha, respectively. The rule of distribution of tree numbers according to peak height in both forest states tends to be left skewed according to the Weibull distribution. Trees regenerated in both forest states with density from 6,000 to 6,640 trees/ha, with good quality accounting for more than 95%, the rate of trees regenerated from seeds was of 98-99%, regenerated plants having growth potential accounts for 46.7% - 53% of the total number of regenerated trees.
Keywords: Forest structure, Ben En National Park, rehabilitation forest.