Changes in Vegetation Structure and Soil Components at Upstream and Downstream Areas of Alaqiq Dam, Southwestern Saudi Arabia.

SAMI ASIR AL-ROBAI; HAIDAR ABDALGADIR MOHAMED; ABDELAZIM ALI AHMED; EMAD ALI ALSHERIF

No Detail Found!

Changes in Vegetation Structure and Soil Components at Upstream and Downstream Areas of Alaqiq Dam, Southwestern Saudi Arabia.

Author(s)

SAMI ASIR AL-ROBAI Department of Biology, Faculty of Science, University of Albaha,Albaha,Saudi Arabia

HAIDAR ABDALGADIR MOHAMED Department of Biology, Faculty of Science, University of Albaha, Albaha, Saudi Arabia Medicinal and Aromatic Plants Research Institute, National Council for Research, Sudan

ABDELAZIM ALI AHMED Department of Biology, Faculty of Science, University of Albaha, Albaha, Saudi Arabia;Department of Botany, Faculty of Science, University of Khartoum, Sudan

EMAD ALI ALSHERIF Department of Biology, Faculty of Sciences and Arts-Khulais, Jeddah University,Saudi Arabia;Department of Botany, Faculty of Science, Beni Suef University,Egypt

Abstract

This work aimed at studying the changes in the vegetation structure and soil components at upstream and downstream areas of Alaqiq dam. A total of 169 species belonging to 124 genera and 47 families were recorded from the area. The upstream zone had 123 species, 98 genera, 41 families while downstream zone had 101 species, 81 genera, 35 families. Poaceae was the dominant family in the study area with 14 genera and 19 species. Therophytes and chamaephytes were the most common life forms indicating a typical desert life-form spectrum. TWINSPAN classified the studied sites into two main groups; the near upstream site represented the first group while the other three sites combined together in the second group. JACCARD'S similarity value revealed that there was a high similarity between far downstream and near downstream sites. Diversity values of Simpson, Shannon-Wiener and Margalef demonstrated that the two near sites of the dam were more diverse than the two far sites. The soil of the study area was not saline (0.18 - 0.86 dS/m),slightly alkaline (pH, 8.46 - 8.62), contained 307.7 - 667.8 mg kg-1 nitrogen and very poor in phosphorus content (? 0.001 mg kg-1).The upstream area had high amount of nitrogen (667.8 mg kg-1) and water (21.47%) contents as compared with the downstream area. This result suggested that the nitrogen and soil water contents strongly influenced the distribution of plants at both areas of the dam. The trace and toxic elements were found in the soil at unpolluted level.

Publication Details

Page(s) 1135-1145

DOI DOI not available

Published Journal: Pakistan Journal of Botany, Volume: 50, Issue: 3, Year: 2018

Request the full text from PASTIC

Keywords

Plant diversity and community