Species diversity,population structure and regeneration of woody species in fallows and mature stands of tropical woodlands of southeast Angola  

作　　者：Francisco M.P.Goncalves Rasmus Revermann Manuel J.Cachissapa Amandio L.Gomes Marcos P.M.Aidar 

机构地区：[1]Herbarium of Lubango,ISCED Huila,Sarmento Rodrigues Str.,230 Lubango,Angola [2]Biocentre Klein Flottbek,University of Hamburg,Ohnhorststr.18,22609 Hamburg,Germany [3]Department of Biology,Faculty of Sciences,Agostinho Neto University,Av.4 de Fevereiro 71,4th Floor,Luanda,Angola [4]Plant Physiology and Biochemistry,Institute of Botany,CP 3005,Sao Paulo,SP CEP:01061-970,Brazil

出　　处：《Journal of Forestry Research》2018年第6期1569-1579,共11页林业研究（英文版）

基　　金：supported by The Future Okavango Project(Grant Number(01LL0912A))

摘　　要：This study in the dry tropical woodlands of SE Angola in Cuando-Cubango Province assessed the diversity and composition of woody species in fallows compared to those in mature woodlands. We assessed the population structure of the most harvested woody species by calculating size class distribution and evaluated their regeneration potential based on the density of saplings. The vegetation was surveyed in 20 plots of 20 × 50 m(1000 m2). In each plot, we measured the diameter at breast height(DBH) of all woody species with DBH ≥ 5 cm. The saplings were counted, identified and recorded; 718 individuals, corresponding to 34 species in 32 genera and 15 families were recorded. The size class distribution of target woody species showed three different patterns in fallows and mature woodlands. In general,most of the smaller diameter classes had more individuals than the larger ones did, showing that the regeneration may take place. However, in some diameter classes, the absence of larger stems indicated selective logging of larger trees. Few saplings were recorded in the fallows or mature woodlands; fire frequency and intensity is probably the main obstacle for seed germination and seedling survival rates in the studied area.This study in the dry tropical woodlands of SE Angola in Cuando-Cubango Province assessed the diversity and composition of woody species in fallows compared to those in mature woodlands. We assessed the population structure of the most harvested woody species by calculating size class distribution and evaluated their regeneration potential based on the density of saplings. The vegetation was surveyed in 20 plots of 20 × 50 m(1000 m2). In each plot, we measured the diameter at breast height(DBH) of all woody species with DBH ≥ 5 cm. The saplings were counted, identified and recorded; 718 individuals, corresponding to 34 species in 32 genera and 15 families were recorded. The size class distribution of target woody species showed three different patterns in fallows and mature woodlands. In general,most of the smaller diameter classes had more individuals than the larger ones did, showing that the regeneration may take place. However, in some diameter classes, the absence of larger stems indicated selective logging of larger trees. Few saplings were recorded in the fallows or mature woodlands; fire frequency and intensity is probably the main obstacle for seed germination and seedling survival rates in the studied area.

关 键 词：Baikiaea woodlands Fallows Mature woodlands REGENERATION Woody species 

分 类 号：S7[农业科学—林学]