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Biodiversity & Ecology © University of Hamburg 2018 All rights reserved Klaus Hess Publishers Göttingen & Windhoek www.k-hess-verlag.de ISBN: 978-3-933117-95-3 (Germany), 978-99916-57-43-1 (Namibia) Language editing: Will Simonson (Cambridge), and Proofreading Pal Translation of abstracts to Portuguese: Ana Filipa Guerra Silva Gomes da Piedade Page desing & layout: Marit Arnold, Klaus A. Hess, Ria Henning-Lohmann Cover photographs: front: Thunderstorm approaching a village on the Angolan Central Plateau (Rasmus Revermann) back: Fire in the miombo woodlands, Zambia (David Parduhn) Cover Design: Ria Henning-Lohmann ISSN 1613-9801 Printed in Germany Suggestion for citations: Volume: Revermann, R., Krewenka, K.M., Schmiedel, U., Olwoch, J.M., Helmschrot, J. & Jürgens, N. (eds.) (2018) Climate change and adaptive land management in southern Africa – assessments, changes, challenges, and solutions. Biodiversity & Ecology, 6, Klaus Hess Publishers, Göttingen & Windhoek. Articles (example): Archer, E., Engelbrecht, F., Hänsler, A., Landman, W., Tadross, M. & Helmschrot, J. (2018) Seasonal prediction and regional climate projections for southern Africa. In: Climate change and adaptive land management in southern Africa – assessments, changes, challenges, and solutions (ed. by Revermann, R., Krewenka, K.M., Schmiedel, U., Olwoch, J.M., Helmschrot, J. & Jürgens, N.), pp. 14–21, Biodiversity & Ecology, 6, Klaus Hess Publishers, Göttingen & Windhoek. Corrections brought to our attention will be published at the following location: http://www.biodiversity-plants.de/biodivers_ecol/biodivers_ecol.php Biodiversity & Ecology Journal of the Division Biodiversity, Evolution and Ecology of Plants, Institute for Plant Science and Microbiology, University of Hamburg Volume 6: Climate change and adaptive land management in southern Africa Assessments, changes, challenges, and solutions Edited by Rasmus Revermann1, Kristin M. Krewenka1, Ute Schmiedel1, Jane M. Olwoch2, Jörg Helmschrot2,3, Norbert Jürgens1 1 Institute for Plant Science and Microbiology, University of Hamburg 2 Southern African Science Service Centre for Climate Change and Adaptive Land Management 3 Department of Soil Science, Faculty of AgriSciences, Stellenbosch University Hamburg 2018 RPlease cite the article as follows: Chisingui, A.V., Gonçalves, F.M.P., Tchamba, J.J., Camôngua Luís, J., Rafael, M.F.F. & Alexandre, J.L.M. (2018) Vegetation survey of the woodlands of Huíla Province. In: Climate change and adaptive land management in southern Africa – assessments, changes, challenges, and solutions (ed. by Revermann, R., Krewenka, K.M., Schmiedel, U., Olwoch, J.M., Helmschrot, J. & Jürgens, N.), pp. 426-437, Biodiversity & Ecology, 6, Klaus Hess Publishers, Göttingen & Windhoek. doi:10.7809/b-e.00355 Vegetation survey of the woodlands of Huíla Province António Valter Chisingui1*, Francisco M. P. Gonçalves1,2, José João Tchamba1, José Camôngua Luís1, Marina Filomena F. Rafael1, and José L. M. Alexandre1 1 Instituto Superior de Ciências de Educação, ISCED-Huíla, Rua Sarmento Rodrigues, 230 Lubango, Angola 2 Institute for Plant Science and Microbiology, University of Hamburg, Ohnhorststr. 18, 22609 Hamburg, Germany * Corresponding author: [email protected] Abstract: We conducted a vegetation survey in the woodlands of Huíla Province, Angola, with the aim of investigating woodland tree communities and species associations. Vegetation sampling was conducted using vegetation plots of 1 000 m2 Biodiversity where all tree species with or above 5 cm trunk diameter (DBH) were measured. A total of 456 vegetation plots were assessed and a total of 32 080 individual trees measured. Vegetation classifi cation using the ISOPAM algorithm resulted in 13 distinct tree communities. The most dominant family was Fabaceae, subfamily Caesalpinioideae, followed by Combretaceae and Euphorbiaceae. The classifi cation resulted in seven tree communities belonging to the miombo woodlands, two tree com- munities from Mopane, two from the Baikiaea-Baphia-Terminalia woodlands, and two other distinct tree communities. In general, the miombo communities were the most diverse. The study represents the fi rst plot-based vegetation survey for the region, and will provide the basis for the elaboration of the fi rst vegetation map of Huíla Province. Resumo: O levantamento da vegetação foi realizado nos bosques da Província da Huíla, Angola, com o objectivo de inves- tigar as comunidades arbóreas e associações de espécies. O processo de amostragem da vegetação foi realizado em parcelas de 1 000 m2, onde todas as árvores com diâmetro à altura do peito (DBH) igual ou acima de 5 cm foram medidas. Avaliámos no total 456 parcelas de vegetação, que resultou num total de 32 080 indivíduos medidos. A classifi cação da vegetação foi feita com recurso ao algorítimo ISOPAM que resultou em 13 comunidades distintas. A família mais dominante foi Fabaceae, subfamília Caesalpinioideae, seguida da família Combretaceae e Euphorbiaceae. A classifi cação da vegetação resultou em sete comunidades de miombo, duas comunidades de Mopane, duas comunidades de Baikiaea-Baphia-Terminalia, e duas outras comunidades distintas. Em geral, as comunidades de miombo foram as mais diversas. O estudo representa o primeiro levantamento feito na região com uso de parcelas, e poderá proporcionar as bases para a elaboração do primeiro mapa de vegetação da Província da Huíla. Introduction remained unstudied in terms of species is no doubt that conservation actions are composition and distribution of vegeta- needed, aimed at preventing and mitigat- Angola harbours an enormous variety tion communities, as most of the previous ing ecologically harmful consequences of habitats, with the miombo woodlands documentation of tree species diversity caused by habitat modifi cations and land covering about 47% of the land area of conducted in the country was based com- use change (Simila et al., 2006). To do so the country (Huntley & Matos, 1994). monly on fl oristic itineraries and not on eff ectively fi rst requires knowledge of the Within Huíla Province, miombo is also detailed vegetation surveys (dos Santos, present ecosystems as well as plot-based the dominant vegetation type. Other im- 1982). inventories that document the fl oristic portant vegetation types include Afro- Huíla Province, like many parts of An- diversity and species composition of the montane forests and grasslands in the gola, faces challenges such as land deg- woodlands. area of the escarpment, and Baikiaea radation and deforestation, and as a result Due to the long period of civil war plurijuga and Colophospermum mopane thereof, loss of biodiversity (Cabral et al., experienced by Angola, information woodlands in the southwestern parts of 2011). The main drivers of these process- on vegetation is scarce and is generally the province. Although the region is prob- es are demand for agricultural land, fi re based on early botanical work, such as ably one of the most botanically studied frequency, fuelwood extraction, charcoal the phytogeographic map of Angola parts of the country and hosts one of the production, and rapid urban develop- (Barbosa, 1970). For the woody vegeta- largest botanical collections in Angola at ment (Röder et al., 2015; De Cauwer et tion of Angolan miombo, only a single the Herbarium of Lubango (LUBA), it al., 2016; Schneibel et al., 2017). There study is known, which resulted in the fi rst 426 C A Biodiversity Figure 1: Map of Southern Africa with the location of the study area corresponding to Huíla Province (in red) and its administrative division into 14 municipalities. Plot locations are coloured by their corresponding woodland community types, derived from the ISOPAM algorithm. provincial map of the Bié Province based Materials and methods Vegetation sampling on 144 plots (Monteiro, 1970). Recently, We used the preliminary classifi cation a few initiatives have started to docu- Study site of a time-series (2001-2013) of MODIS ment the fl oristic diversity of the region, The woody vegetation was assessed in satellite imagery and derived phenol- though attention has been paid mostly to the woodlands of Huíla Province, located ogy metrics to identify major vegetation areas of particular botanical interest, such in southwestern Angola. The province units (Stellmes et al., 2013). The map so as the Angolan escarpment (Barker et al., occupies an estimated area of about 78 obtained was used to create a random 2015; Gonçalves & Goyder, 2016; Gon- 879 km2, divided into 14 municipalities stratifi ed plot sample design across the çalves et al., in prep.). Studies addressing (Fig. 1). The climate of the region is con- vegetation units of the study area. A total fl oristic diversity and woody species re- sidered tropical, with dry and cold winters of 456 vegetation plots of 20 m x 50 m covery following disturbance of the mi- and temperate rainy summers; the mean were used to assess the vegetation; within ombo woodlands in south-central Angola annual temperature varies from 18°C in each plot, all woody species reaching a have also been conducted (Gonçalves et the highlands of Humpata to 20°C in the diameter at breast height (DBH) ≥ 5 cm al., 2017; Revermann et al., 2018). How- eastern parts of the province (Köppen- were measured. The taxonomy of woody ever, much remains to be done in terms Geiger, 1936). Annual precipitation in- species followed the Angolan checklist of vegetation assessment to characterise creases from 700 mm in the southwest of of vascular plants (Figueiredo & Smith, the main vegetation types
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