TITLE:
Ecological Study of Two Grasses: Cenchrus ciliaris and Digitaria commutate Endangered Autochthonous of the Dry Zone of Tunisia
AUTHORS:
Imen Dhib, Abdessalem Abdessamad, Mustapha Ksontini, Ali Ferchichi
KEYWORDS:
Ecological Study, Grasses, Endangered, Dry Zone Of Tunisia
JOURNAL NAME:
Open Journal of Forestry,
Vol.4 No.4,
July
31,
2014
ABSTRACT:
The Saharian ecosystems
present an important intensity of rising sensitization to: Erosion, and
desertification whose impacts are irreversible. On the one hand, the weakness
of the yield and the poverty of soil lead to a limited biodiversity. In
addition to these difficulties, hydra is the main cause of the rarification of
certain pastoral species such as Cenchrus ciliaris and Digitaria commutata.
The ecological study underlines a distribution of these species which are very
dependent on water resources in the dry regions of Tunisia. The bioclimatic
(temperature, pluviometry) variations lead to modifications to these species
from one area to another which are translated through several parameters. Concerning
the number of bundles, the difference is important. The national park of
Bouhedma records the highest number, compared with Bni khdach, Jerba, Khanguit
aicha and Matmata respectively. The variation inter-site of study also is
considerable by the study of the morphological parameters (height, number and
length of leaves by bundle, number of ear) whose bundles of the national park
Bouhedma occupy the first class.