Ecological Study Of Natural Grassland Community: Nagative And Positive Association Of Plant Species In Taiz, Yemen

S. Mahdi, Abdulkaliq

	Ecological Study Of Natural Grassland Community: Nagative And Positive Association Of Plant Species In Taiz, Yemen
Tikrit Journal of Pure Science
Article 1, Volume 17, Issue 4, 2012, Pages 11-16
Author
Abdulkaliq S. Mahdi
Abstract
The study area was grassland located 5km near Taiz City, Yemen, at a rainy season (June-August 2005). The vegetation community of this area consisted of 72 species representing 27 families: 1- Fabiaceae, 9 species, covering 15%, the most important species, were: Indigofra spinosa, I. Arabica, and Accacia millfera 2- Poaceae (Graminae) 7 species, covering 16.7%, the most importance species were Eragrostis papposa, Aristida sp. 3- Euphorbaceae, 7 species, covering 9.4%, the most important of this family were Euphobbia inarticulate, E. cactus, and Adenium obesum. 4- Astaraceae, (Compositae), 7 species, covering 9.2%, the most important for this family were: Flaveria trinerva, and Pulicaria jubertii. 5- Acanthaceae, 6 species, covering 5.7%, the important species was: Belepharis ciliaria. In Quantitative charectarestic: the total of vegetation cover for all the species consisted this community was 87.1%. The criteria for each species included: dominance, frequency, abundance and Important value Index (IVI), which used dominance for Association species. The association species indicated that Cissus rutindofolia (Vitaceae), was in negative state with Fagpnia indica, (Zygophyllaceae), and Eragrostis papposa (Poaceae), and in positive state with Hypostis farskalei (Acanthaceae). Whereas Heliotropium aegyptica (Boraginaceae) was in negative state with Aerva javanica (Amaranthaceae) and with Commicarpus fruticosus (Nectaginaceae), but this species (H. aegypticum) was in positive state with Belepharis ciliaria (Acanthaceae). Whereas B. ciliaria has a significantly positive relation with E. papposa and Aerva javanica.

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