Vegetation, species diversity and floristic relations along an altitudinal gradient in south-west Saudi Arabia

Hegazy, Ahmad K.; El-Demerdash, Mohamed; Hosni, Hasnaa A.

doi:10.1006/jare.1997.0311

Cited by 83 publications

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“…Em 2013, todos os resultados destas variáveis se aproximaram ao das regiões áridas, com a biomassa vegetal abaixo de 2 Mg • ha -1 (Cowlishaw & Davies, 1997;Hegazy et al, 1998;Houérou, 1997;Abbadi et al, 2002;Enright et al, 2005;Hanafi, 2008;Bisigato et al, 2009;Vilela et al, 2009), com registros da fauna nativa (mastofauna, avifauna e hepertofauna) menores que 10 indivíduos por hectares (Wang et al, 2001;Scott et al, 2005;Ojeda & Tabeni, 2009;Fokidis, 2011;Rodríguez & Ojeda, 2011;McDonald, 2012;Herrmann & Branch, 2013) e índices de diversidade de Shannon menores que 0,3 (Houérou, 1997;Kraaij & Milton, 2006;Chillo & Ojeda, 2012;Sow et al, 2014). Essas tendências dos dados também foram descritas em outras localidades áridas submetidas à perturbação antrópica, à mudança do uso da terra e ao extrativismo (Tabeni & Ojeda, 2003Reij et al, 2005;Sow et al, 2014).…”

Section: Resultados Das Variáveis Ambientais E Humanasunclassified

Resistência social na Caatinga árida: a narrativa de quem ficou no colapso ambiental

Santana

2016

Desenvolv. Meio Ambiente

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Artigo recebido em 19 de outubro de 2015, versão final aceita em 23 de maio de 2016. RESUMO:A região analisada é historicamente um espaço de conflitos e de uma "violência fundadora", situada acima do médio São Francisco, entre as cidades de Ibimirim e Cabrobó (Pernambuco/Brasil). A presença desses conflitos, associada ao colapso ambiental causado pelo neoextrativismo local e ao clima árido, são fortes indícios para influenciarem a dinâmica populacional. Porém, o contrário é observado na região. A manutenção da população na região é corroborada pelo baixo valor de emigração e pelas narrativas. Por isso, variáveis ambientais e sociais foram coletadas e analisadas para avaliar se a ausência de uma dinâmica populacional é motivada por uma resistência social. Assim, o objetivo deste trabalho foi analisar o contexto ambiental e a narrativa de quem ficou no colapso da matéria-prima na Caatinga Árida pós-neo-extrativismo, onde se pôde notar que a manutenção da população na região trata-se de uma expressão da resistência social local, na interface entre parâmetros ambientais e sociais analisados. A preservação da herança familiar (patrimonialismo) foi considerada o principal destaque nas narrativas dos sertanejos.Palavras-chave: mobilização social; desertificação; neoextrativismo. ABSTRACT:The analyzed region is historically a place of conflict and a 'founding violence', situated above São Francisco River, between the cities of Ibimirim and Cabrobó (Pernambuco/Brazil). The presence of those conflicts, associated with the environmental collapse, caused by the new local extractiv and arid climate, are strong evidence to act on population dynamics. However, the opposite is observed in the region. The maintenance of population there is supported by the low value of emigration and by narratives. Therefore, environmental and social variables were collected and analyzed to assess whether a social resistance motivates the lack of population dynamics. The objective of this study was to analyze the environmental context and the narratives of who remained in collapse of raw material in Arid Caatinga post the new extractivism. Where one might note that the maintenance of the population in the region is an expression of local social resistance, on the

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Section: Resultados Das Variáveis Ambientais E Humanasunclassified

Resistência social na Caatinga árida: a narrativa de quem ficou no colapso ambiental

Santana

2016

Desenvolv. Meio Ambiente

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“…Wickens (1977) and Boulos (1997) mentioned that the Saharo-Arabian region is characterised by the presence of few endemic species and genera. The Saharo-Arabian species that are restricted in their distribution to the central strip of Saudi Arabia are more abundant in habitats with more favourable microenvironmental conditions and those providing better protection (Ghazanfar & Fisher, 1998;Hegazy et al, 1998;El-Ghanem et al, 2010).…”

Section: Discussionmentioning

confidence: 99%

Floristic diversity and vegetation analysis of Wadi Al-Noman, Mecca, Saudi Arabia

Khalik¹,

El‐Sheikh²,

Elaidarous³

2013

Turk J Bot

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Wadi Al-Noman in Mecca is one of the most important wadis. It was included among the most important water sources where the springs and wells of Zobida run and it provides drinking water for the holy places in Mecca and visitors to the Kaaba and Arafat regions. The present study provides an analysis of floristic composition, vegetation types, and structure and species distribution at 20 sites, emphasising the environmental factors that affect species distribution. A total of 126 species representing 39 families of vascular plants are recorded. Fabaceae, Poaceae, and Boraginaceae are the largest families, and therophytes and chamaephytes are the most frequent, indicating a typical desert life-form spectrum. The floristic composition of the different geomorphologic landscape units shows differences in species richness. The highest species richness value (23 species stand -1 ) is recorded in the wadi bed. The lowest species richness value (18 species stand -1 ) is recorded in the wadi plateau and fissures. Chorological analysis revealed that 52% of the studied species are bioregional, native to the Saharo-Arabian-Sudano-Zambezian region. After application of the TWINSPAN, DCA, and CCA programs 4 vegetation groups were identified, and they were named after the characteristic species as follows: (I) Aristolochia bracteolata-Cucumis prophetarum; (II) Calotropis procera-Acacia hamulosa-Caralluma russeliana; (III) Acacia abyssinica-Acacia hamulosa-Tephrosia desertorum; and (IV) Argemone ochroleuca-Senna italica. The associations and speciation of these Wadi Al-Noman plants demonstrate significant variation in pH, electrical conductivity, soil mineral contents, and human impact.

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“…This plant has a higher water demand than other Acacia spp. Hegazy et al (1998) (Table 3). These results are in accordance with what was proved in previous studies by (Marie, 2006, El-Gazzar et al, 2007and El Khuly& Ramadan, (2017.…”

Section: Discussionmentioning

confidence: 99%

Comparison study of the plant communities of El Khukha area of El Hudayda Governorate of the coastal plains of Red Sea and El Najed El Ahmar area of Ibb governorate, Yemen Republic

2017

Int. J. Adv. Res. Biol. Sci

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This study carried out on El Khukhaarea and El Najed El Ahmar, in Yemen Republic. El Khuka area is located in the province of El Hudayda, it is characterized by dry climate and low of rain fall, while El Najed El Ahmar area which is located in Ibb gowernorate characterized by moderate climate throughout the year and the amount of rainfall is very large and rich vegetation with diversity of plants. A total of49 species belonging to28 families collected from 17 sites in the study area. From The results Asteraceae was the most abundant family comprising species (5species) related by Asclipiadaceae, Fabaceae and Poaceae represented by 4 species. Acanthaceae included 3 species. The plant life form of the studied area show that the highest life form recorded was for Phanerophytes constituted species representing 21 species ( 42.6 % ) of the total species followed by the chaemophytes 12 species (26.4 %),Cryptophytes representing 9 species (18 .4 % ), Therophytes 5 species (10.3 %) and Hemicryptophytes only with one species ( 2.3% ).Application of TWINSPAN led to classifying the seventeen sites of the study area into four vegetation groups (00, 010, 011and 100). El Khukha sites were contain Groups 00, 001 and 01. Group 00 was dominated by Odyssia mucronata in sites 1 to 5, while in site 6 was Odyssia mucronata community was recorded high cover value in El Khukh dominated by Prosopis juliflora. Group 010 were dominated by Prosopis juliflora, Hyphaene thebaica group 011 was dominated by Phoenix dactylifera and group 1 were dominated by Guizotia scarab ( sites 16 & 17 ), Acacia etbaica (site 15), Opuntiaficus-indica (site 13), Rumex nervosus ( site 14 ).DECORANA results have confirmed the classification of TWINSPAN where groups A , b and C that represents El Khukha of Tihama plains were positively correlated to axis 2 while group A D that represents El Najed El Ahmar of Ibb governorate positively correlated with axis 1. Ordination has shed light on the relations among plant communities and different soil parameters where communities El Khukha of Tihama plains (Odyssia mucronata, Prosopis juliflora Hyphaene thebaica and Phoenix dactylifera) were positively correlated with calcium and carbonate, while communities El Najed El Ahmar of Ibb governorate (Guizotia scarab, Acacia etbaica, Opuntiaficus-indica , Rumex nervosus) were positively correlated with the chlorides, pH, Magnesium, Organic carbon, moisture content and E C.ANOVA showed that the moisture content has recorded the highest level of significance in comparison to other soil parameters.

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Vegetation, species diversity and floristic relations along an altitudinal gradient in south-west Saudi Arabia

Cited by 83 publications

References 0 publications

Resistência social na Caatinga árida: a narrativa de quem ficou no colapso ambiental

Resistência social na Caatinga árida: a narrativa de quem ficou no colapso ambiental

Floristic diversity and vegetation analysis of Wadi Al-Noman, Mecca, Saudi Arabia

Comparison study of the plant communities of El Khukha area of El Hudayda Governorate of the coastal plains of Red Sea and El Najed El Ahmar area of Ibb governorate, Yemen Republic

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