Contribution à l’étude de la thérophytisation des matorrals des versants sud des monts de Tlemcen (Algérie occidentale)

Hachemi, Nouria; Hasnaoui, Okkacha; Benmehdi, Ikram; Medjati, Nadjat; Bahaj, Mohamed

doi:10.14198/mdtrra2012.23.06

Cited by 5 publications

(3 citation statements)

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“…Several authors (Daget, 1980;Barbero et al, 1990;Aidoud, 1984) underline the relationship between the high rate of therophytes and the increasing gradient of aridity in the Algerian steppe areas. The phenomenon of therophytisation observed in the present study is probably related to the arduous climatic conditions but also to the anthropogenic actions (Benabadji & Bouazza, 2002;Benaradji et al, 2009;Hachemi et al, 2012). The high number of therophytes taxa represented in our list indicate some undergoing degradation of the local vegetation like in the Mediterranean region (Miara et al, 2016).…”

Section: The Biological Typessupporting

confidence: 53%

Floristic diversity of steppe vegetation in the region of Djelfa, North-West Algeria

Habib

Regagba

Mıara

et al. 2020

abm

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This study is a floristic investigation of the steppe region of Djelfa located in northern Algeria, with the aim of characterizing and analysing the wild flora of this region. Four stations were chosen according to a stratified sampling method and phyto-ecological surveys were carried out in 32 plots of 100m2 each. This allowed us to identify 127 taxa of plants belonging to 33 families dominated by Asteraceae (29%) and Poaceae (12%). The analysis of biological types has shown the dominance of annual Therophytes (56%) in this flora, which indicates the presence of the phenomenon of Therophytization in these regions. This phenomenon was also measured by calculating the perturbation index. The analysis of chorological types has shown the dominance of the Mediterranean element (48%), with an interesting number of endemic taxa. However, all the endemic taxa cited in the literature for this region have not been found, which reinforces our fears about the state of conservation of these taxa of biological and heritage value.

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Section: The Biological Typessupporting

confidence: 53%

Floristic diversity of steppe vegetation in the region of Djelfa, North-West Algeria

Habib

Regagba

Mıara

et al. 2020

abm

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“…These two species were also found in the Temara urban area according to this study, but in a lower abundance. The high rate of therophytes is mainly linked to the harsh climate and anthropogenic activities, which contribute to the degradation of conditions favorable to the establishment of new species (Hachemi, 2015). Thus, therophytes crowd out other life forms when environmental conditions become harsh (Yerou, 2022) as in the case of the urban environment.…”

Section: Biological Typesmentioning

confidence: 99%

Analysis of the Diversity of Spontaneous Urban Flora: The Case of Temara City, Morocco

Boukita,

Ziri,

Brhadda

et al. 2024

Ecol. Eng. Environ. Technol.

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Spontaneous flora offers many functions and potentialities in the urban ecosystem. However, few studies have been carried out on this subject in Morocco. The present study aimed to analyze the diversity of spontaneous flora in the urban area of Temara, to contribute to interpreting the structure and dynamics of Moroccan spontaneous flora. During the study, 90 floristic surveys were carried out along four transects, marked A, B, C, and D so that each transect started from the city center and went in one of the four directions of the study area. Transect A ran northwards from the city center, transect B westwards, transect C southwards, and transect D eastwards from the city center. To carry out the floristic surveys, several survey areas were chosen, given the heterogeneity of the urban environment. These areas ranged from a few cm 2 for rock fissure plants, through 10 to 25 m 2 for grasslands, to 25 to 100 m 2 for forest cuttings. The results revealed a total of 137 taxa grouped in 116 genera and belong to 33 floristic families. The Asteraceae family came out on top, with 30 species (21.90%) and 24 genera, and the Poaceae family was in second place with 21 species (15.33%) divided into 20 genera. Analysis of this floristic list indicates a predominance of the therophyte life form (48.90%), then hemicryptophytes (26.28%) followed by geophytes (10.22%) in terms of biological type, and a predominance of the Mediterranean element (31.19%) in terms of chorological type. Of the 137 taxa inventoried, 10 are very rare, 1 is rare, 1 has a doubtful presence, and 2 are endemics. This study showed that even in a disturbed and fragmented environment, such as the urban environment, certain spontaneous plant species adapt to the conditions prevailing in this habitat and show considerable diversity, thus contributing to a better interpretation of the composition and dynamics of the country's flora.

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“…Cet indice est de 65,47%, ce qui indique une forte thérophytisation. Cette dernière implique une dégradation de la végétation qui est due à une anthropisation intense (Hachemi et al, 2012;Miara et al, 2016).…”

Section: Le Changement Climatiqueunclassified

Approche diachronique de la flore des bassins fermés halomorphes de la région d’Oran (N-O Algérie)

Bahi¹,

Mıara²,

Hadjadj-Aoul³

2020

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Cette étude est une approche diachronique d’étude de la flore et de la végétation des zones humides de la région d’Oran. Son but est de proposer une liste actualisée de la flore présente au niveau des ceintures des cinq bassins fermés d’Oran (la grande sebkha d’Oran, dayat Morsli, Oum El-Ghelaz, le lac Télamine et les salines d’Arzew). Cela nous permettra de d’identifier les changements que cette flore a subi et d'apprécier par conséquent la dynamique de la végétation locale à la lumière des conditions écologiques et anthropiques. Nous avons réalisé 60 relevés phytoécologiques suivant un échantillonnage stratifié. Les espèces récoltées ont été identifiées et leurs noms actualisés ce qui a permis de dresser une liste actualisée de la flore régionale. Cette liste a été comparée à une autre liste plus ancienne datant de 50 ans. La liste des taxons comporte 175 espèces relevant de 127 genres et de 39 familles. Le type biologique est dominé par des thérophytes de chorologie méditerranéenne. L’analyse diachronique des taxons retrouvés rapporte la présence de 80 espèces figurant dans les deux listes et la présence de 94 espèces (55%) nouvelles. Le nombre d’espèces tolérantes au sel reste relativement limité. Les ceintures de végétations étudiées connaissent une anthropisation importante due principalement au pâturage. La composition floristique a pu être également affectée par le changement climatique.

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Contribution à l’étude de la thérophytisation des matorrals des versants sud des monts de Tlemcen (Algérie occidentale)

Abstract: Contribution à l'étude de la thérophytisation des matorrals des versants sud des monts de Tlemcen (Algérie occidentale) 161 ÍNDICE forest-matorral-lawn. More than 3/4 of species found in the study area belong to therophytes and hemicryptophytes.

Cited by 5 publications

References 0 publications

Floristic diversity of steppe vegetation in the region of Djelfa, North-West Algeria

Floristic diversity of steppe vegetation in the region of Djelfa, North-West Algeria

Analysis of the Diversity of Spontaneous Urban Flora: The Case of Temara City, Morocco

Approche diachronique de la flore des bassins fermés halomorphes de la région d’Oran (N-O Algérie)

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