naa a22 4500 510774865 CHVBK 20180411083227.0 cr unu---uuuuu 180411e20131201xx s 000 0 eng 10.1007/s12210-013-0246-0 doi (NATIONALLICENCE)springer-10.1007/s12210-013-0246-0 Vegetation of Thumamah Nature Park: a managed arid land site in Saudi Arabia [Elektronische Daten] [Mohamed El-Sheikh, Jacob Thomas, Abdulrahman Alatar, Ahmed Hegazy, Ghanim Abbady, Ahmed Alfarhan, Mohamed Okla] Thumamah Nature Park is located at about 100km north of Arriyadh (Saudi Arabia), having an area of 170km2. The Park was established since 30years ago. The aim of this study is to analyze the vegetation structure in relation to the environmental factors in different habitat types. The phenological activities around the year of the 20 dominant species were monitored. 119 species were identified, of which 51 (43%) annuals and 68 (57%) perennials after 30years of exclusive human impact. The Saharo-Arabian component species were the highest among the monoregional species (64%) in most life forms, while the Sahelien-Somali Masai attained the highest among the biregionals (46%). The TWINSPAN, DCA and CCA analyses separated seven vegetation groups. The first two groups were dominated by psammophytic species, which occupy the lower sandy plain as shown in group I with Rhanterium epapposum-Rhazya stricta and group II with Pennisetum divisum-Haloxylon salicornicum. The escarpment habitat was characterized by three groups, viz., group III with Acacia gerrardii-Panicum turgidum, group IV with Panicum turgidum and group V with Acacia ehrenbergiana-Lasiurus scindicus. Vegetation in the upland plateau was represented by the remaining two groups; group VI with Helianthemum lippii and group VII with Helianthemum kahiricum. The environmental variables that affect the species distribution and diversity in the park include the altitude, soil texture, pH, EC, Ca, Mg and Mn. The increased plant species richness, turnover, evenness and cover were mostly due to the increase of the herbaceous species. Plant populations showed interspecific variations in their relative timing of phenological phases with reproductive activity period ranged between 3 and 6months with unimodal flowering peak. Three flowering-fruiting activities were recorded during late winter-spring, summer and late autumn-early winter. In an attempt to explain the vegetation dynamics after 30years conservation, the progressive succession varied among the different habitat types, including the lower sandy sites, the escarpment and the upland rocky habitats, which reflect the relationship between altitude, edaphic factors and the type of vegetation units in each habitat type after exclusion of the human impact. Accademia Nazionale dei Lincei, 2013 Keystone species nationallicence Landscape nationallicence Najd Plains nationallicence Psammophytic species nationallicence Succession nationallicence El-Sheikh Mohamed Botany and Microbiology Department, College of Science, King Saud University, P.O. Box 22455, 11451, Riyadh, Saudi Arabia aut Thomas Jacob Botany and Microbiology Department, College of Science, King Saud University, P.O. Box 22455, 11451, Riyadh, Saudi Arabia aut Alatar Abdulrahman Botany and Microbiology Department, College of Science, King Saud University, P.O. Box 22455, 11451, Riyadh, Saudi Arabia aut Hegazy Ahmed Botany and Microbiology Department, College of Science, King Saud University, P.O. Box 22455, 11451, Riyadh, Saudi Arabia aut Abbady Ghanim Biological Science Department, Faculty of Science, Kuwait University, P.O. Box 5969, 13060, Safat, Kuwait aut Alfarhan Ahmed Botany and Microbiology Department, College of Science, King Saud University, P.O. Box 22455, 11451, Riyadh, Saudi Arabia aut Okla Mohamed Botany and Microbiology Department, College of Science, King Saud University, P.O. Box 22455, 11451, Riyadh, Saudi Arabia aut Rendiconti Lincei Springer Milan 24/4(2013-12-01), 349-367 2037-4631 24:4<349 2013 24 12210 https://doi.org/10.1007/s12210-013-0246-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12210-013-0246-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- El-Sheikh Mohamed Botany and Microbiology Department, College of Science, King Saud University, P.O. Box 22455, 11451, Riyadh, Saudi Arabia aut NATIONALLICENCE 700 1- Thomas Jacob Botany and Microbiology Department, College of Science, King Saud University, P.O. Box 22455, 11451, Riyadh, Saudi Arabia aut NATIONALLICENCE 700 1- Alatar Abdulrahman Botany and Microbiology Department, College of Science, King Saud University, P.O. Box 22455, 11451, Riyadh, Saudi Arabia aut NATIONALLICENCE 700 1- Hegazy Ahmed Botany and Microbiology Department, College of Science, King Saud University, P.O. Box 22455, 11451, Riyadh, Saudi Arabia aut NATIONALLICENCE 700 1- Abbady Ghanim Biological Science Department, Faculty of Science, Kuwait University, P.O. Box 5969, 13060, Safat, Kuwait aut NATIONALLICENCE 700 1- Alfarhan Ahmed Botany and Microbiology Department, College of Science, King Saud University, P.O. Box 22455, 11451, Riyadh, Saudi Arabia aut NATIONALLICENCE 700 1- Okla Mohamed Botany and Microbiology Department, College of Science, King Saud University, P.O. Box 22455, 11451, Riyadh, Saudi Arabia aut NATIONALLICENCE 773 0- Rendiconti Lincei Springer Milan 24/4(2013-12-01), 349-367 2037-4631 24:4<349 2013 24 12210 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer