Estudo da composição e estrutura arbórea ao longo de um gradiente altitudinal na Reserva Florestal de Moribane

Abstract

A transect with 16 plots of 0.1 ha in the east-southwest direction was used to compare the composition, structure, diversity of arboreal vegetation and to identify the factors that most affect the composition of the Moribane Forest Reserve, which is located in Manica Province, central of Mozambique, in an altitudinal range of 245m to 641m range were defined 4 altitudinal ranges of 200-4000m, Newtonia buchananii 400-500m and above 600m, and Millettia stuhlmamnii, Funtumia africana, Newtonia buchanall of 400-500m. The Composition at 200-400m showed very low similarity to the remaining altitudinal ranges. In altitudinal intervals above 400m, there was a greater similarity. The diametric distribution was of the inverted "J" type typical of native forests and distinct between the altitudinal intervals. Diversity did not show significant differences between the altitudinal ranges. The arrangement of the plots by CCA allowed the distinction of 2 types of woody formations: The open forest or miombo, dominated by the species Brochystegia spiciformis and the hygrophilous forest dominated by Newtonia buchananil and Funtumia africana and Millettia stuhlmanii. The PCA showed that the main gradient was from low altitude sites with high sand, pH and silt content to soils with higher clay content, low pH values ​​that are not very lininous and high. The work showed that texture is the determining factor in the differentiation of plant types in the study area and that species composition was largely related to soil texture. A transect with 16 plots of 0.1 ha in the east-southwest direction was used to compare the composition, structure, diversity of arboreal vegetation and identification of the factors that most affect the composition in the Moribane Forest Reserve, which is located in Manica Province, central of Mozambique, in an altitudinal range of 245m to 641m. In this interval, 4 altitudinal intervals were defined from 200-4000m, Newtonia buchananii 400-500m and above 600m, and Millettia stuhlmamnii, Funtumia africana, Newtonia buchanall from 400-500m. The Composition at 200-400m showed very low similarity to the remaining altitudinal ranges. In altitudinal intervals above 400m, there was a greater similarity. The diametric distribution was of the inverted "J" type typical of native forests and distinct between the altitudinal intervals. Diversity did not show significant differences between the altitudinal ranges. The arrangement of the plots by CCA allowed the distinction of 2 types of woody formations: The open forest or miombo, dominated by the species Brochystegia spiciformis and the hygrophilous forest dominated by Newtonia buchananil and Funtumia africana and Millettia stuhlmanii. The PCA showed that the main gradient was from low altitude sites with high sand, pH and silt content to soils with higher clay content, low pH values ​​that are not very lininous and high. The work showed that texture is the determining factor in the differentiation of plant types in the study area and that species composition was largely related to soil texture.