scholarly journals Ecological significance of floristic composition and life forms of Riyadh region, Central Saudi Arabia

2020 ◽  
Vol 27 (1) ◽  
pp. 35-40 ◽  
Author(s):  
Najla A. Al Shaye ◽  
Yahya S. Masrahi ◽  
Jacob Thomas
Keyword(s):  
Saudi Arabia ◽  
Floristic Composition ◽  
Life Forms ◽  
Ecological Significance

scholarly journals Impact of elevation and slope aspect on floristic composition in wadi Elkor, Sarawat Mountain, Saudi Arabia

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mohamed A. Fadl ◽  
Hatim M. Al-Yasi ◽  
Emad A. Alsherif
Keyword(s):  
Saudi Arabia ◽  
Plant Species ◽  
Vascular Plant ◽  
Floristic Composition ◽  
Life Forms ◽  
Slope Aspect ◽  
The North ◽  
Total Plant ◽  
Special Location ◽  
Makkah City

AbstractThe current research was carried out in Wadi Elkor, one of the Sarawat Mountains regions, which is a special location from an environmental standpoint and one of the only places in Saudi Arabia where a range of Palaearctic flora co-exists with Afrotropical species. The study aimed to determine the floristic composition as well as the effects of slope aspect and elevation on species, life forms, and phytogeographical elements distribution. The study area is located in Wadi Elkor, a valley in the Sarawat Mountains that cuts off the Al-Hada escarpment, 47 km southeast of Makkah City, Saudi Arabia. We conducted the research at three different locations, each with a different elevation and slope aspect. Based on floristic composition, Ward classification moreover Jaccard comparisons were performed. A total of 189 species was discovered, divided into 131 genera and 43 families. The current study identified Argyrolobium rarum Dumme as a new vascular plant in Saudi Arabia's terrestrial flora. In the current study, the Gramineae, Leguminosae, and Compositae families contributed 29% of the total plant species, whereas 14 families were represented by one species each. Solanum was the most numerous genus, with seven species, followed by Acacia and Pulicaria, each with six species, while Commicarpos and Euphorbia, each with four species. At an elevation of 1060 m above sea level, the north facing slope had the most plants, genera, and families. Therophytes had the most species, accounting for 44%, followed by Chamaephytes, which accounted for 26%. Hemicryptophytes accounted for 12% of the total, while phanerophytes accounted for 10%. In the studied area, the bioregional Saharo-Sindian and Sudano-Zambesian groups were the most well-represented (41%). The floristic composition, as well as the distribution of life forms and phytogeographical components, were found to be significantly affected by the elevation and slope aspects. The study showed that slope aspect and elevation both affected the distribution of plant species, with elevation being the most influential of the two variables.

scholarly journals Effects of open grazing and livestock exclusion on floristic composition and diversity in natural ecosystem of Western Saudi Arabia

2015 ◽  
Vol 22 (4) ◽  
pp. 430-437 ◽  
Author(s):  
Saud L. Al-Rowaily ◽  
Magdy I. El-Bana ◽  
Dhafer A. Al-Bakre ◽  
Abdulaziz M. Assaeed ◽  
Ahmad K. Hegazy ◽  
...  
Keyword(s):  
Saudi Arabia ◽  
Floristic Composition ◽  
Natural Ecosystem

scholarly journals Floristic composition of the Montane Forest in the Almadina-Barro Preto axis, Southern Bahia, Brazil

2014 ◽  
Vol 14 (1) ◽  
Author(s):  
Macielle Macedo Coelho ◽  
André Márcio Amorim
Keyword(s):  
Species Richness ◽  
Tropical Forests ◽  
Atlantic Forest ◽  
Floristic Composition ◽  
Woody Species ◽  
Life Forms ◽  
Montane Forest ◽  
Forest Remnants ◽  
Southern Bahia ◽  
Arboreal Habit

The aim of this study is to survey the angiosperms of two montane forest remnants in the southern Bahia, Brazil: Corcovado (SCO) and Pedra Lascada (SPL). Both fragments are located in the municipality of Almadina and Barro Preto, respectively, and are 18 km distant from each other. We sampled 899 species of angiosperms distributed in 437 genera and 116 families. The SCO was the richest area with 678 species, distributed in 367 genera and 100 families. SPL showed 466 species in 269 genera and 88 families. The percentage of species identified was 85.8% and of this total, 37.7% are endemic to the Atlantic Forest, 11.2% are endemic to southern Bahia and northern Espírito Santo and 7% are disjunct between the Atlantic Forest and Amazon. The remaining percentages (44.3%) were of species widely distributed. The richest families in the two areas were Orchidaceae (10%), Rubiaceae (7%), Bromeliaceae (5.5%), Melastomataceae (4.2%) and Poaceae (4%). The richest genera were Psychotria (2%),Piper (1.8%), Ocotea (1.6%),Vriesea (1.5%) and Peperomia (1.4%). More than half of the recorded species showed non-arboreal habit, regarding life forms documented. That comes against the assertion that many authors in the tropical forests, where species richness in angiosperms is expected for non-woody species, especially in montane forests. Twelve species have been identified as new, but seven others already described from collections previously obtained in these two areas. Orchidaceae, Rubiaceae, Poaceae and Bromeliaceae showed significant richness in this study these families are commonly reported as the richest in other inventories in the Atlantic Forest in southern Bahia reinforcing their importance to the regional flora. The high levels of richness, endemism, and the growing numbers of new taxonomic discoveries from the SPL and SCO sites indicate the biological importance of these two forest remnants. The implementation of parks or other protected environmental reserves would be essential to the conservation of its species.

scholarly journals Consideration of NDVI thematic changes in density analysis and floristic composition of Wadi Yalamlam, Saudi Arabia

2018 ◽  
Vol 7 (4) ◽  
pp. 297-306 ◽  
Author(s):  
Amal Y. Aldhebiani ◽  
Mohamed Elhag ◽  
Ahmad K. Hegazy ◽  
Hanaa K. Galal ◽  
Norah S. Mufareh
Keyword(s):  
Saudi Arabia ◽  
Vegetation Cover ◽  
Vegetation Index ◽  
Normalized Difference Vegetation Index ◽  
Remote Sensing Data ◽  
Floristic Composition ◽  
Water Source ◽  
Shannon Index ◽  
Landsat 8 ◽  
Main Stream

Abstract. Wadi Yalamlam is known as one of the significant wadis in the west of Saudi Arabia. It is a very important water source for the western region of the country. Thus, it supplies the holy places in Mecca and the surrounding areas with drinking water. The floristic composition of Wadi Yalamlam has not been comprehensively studied. For that reason, this work aimed to assess the wadi vegetation cover, life-form presence, chorotype, diversity, and community structure using temporal remote sensing data. Temporal datasets spanning 4 years were acquired from the Landsat 8 sensor in 2013 as an early acquisition and in 2017 as a late acquisition to estimate normalized difference vegetation index (NDVI) changes. The wadi was divided into seven stands. Stands 7, 1, and 3 were the richest with the highest Shannon index values of 2.98, 2.69, and 2.64, respectively. On the other hand, stand 6 has the least plant biodiversity with a Shannon index of 1.8. The study also revealed the presence of 48 different plant species belonging to 24 families. Fabaceae (17 %) and Poaceae (13 %) were the main families that form most of the vegetation in the study area, while many families were represented by only 2 % of the vegetation of the wadi. NDVI analysis showed that the wadi suffers from various types of degradation of the vegetation cover along with the wadi main stream.

scholarly journals ENVIRONMENTAL CHANGE AND LANDUSE SCENARIOS UNDER CHANGING CLIMATES: THE EXPERIENCE IN THE UPPER CROSS RIVER REGION, NIGERIA

2020 ◽  
Vol 6 (11) ◽  
pp. 32-42
Author(s):  
Innocent A. Ugbong ◽  
Ivan V. Budagov
Keyword(s):  
Environmental Changes ◽  
Floristic Composition ◽  
Life Forms ◽  
Soil Conditions ◽  
Land Use Patterns ◽  
Cross River ◽  
Cross River State ◽  
Use Patterns ◽  
River Region ◽  
Descriptive Approach

This paper seeks to show that due to changing climates, there are salient marginal Sahelian conditions (conditions of aridity) emerging on the Northern fringes of Cross River State, a state that is geographical positioned in the southern rainforest belt of Nigeria. The paper adopts a simple descriptive approach and shows the distinct characteristics of this zone, in terms of floristic composition and edaphic and geomorphic structures under changing conditions. Some relationships are established between environmental variables like health, water supply and crop-yield on one hand, and climatic variation, floral life-forms and soil conditions on the other. The changing land use patterns relative to environmental changes are also examined. The paper concludes with a look at current and future adaption strategies to these climate-induced conditions.

scholarly journals Assessment of the Vegetation State of Several Under-exploited Agrostis tenuis - Festuca

2012 ◽  
Vol 69 (1) ◽  
Author(s):  
Ionel SAMFIRA ◽  
Veronica SÄ‚RÄ‚TEANU ◽  
Marius BOLDEA ◽  
Branko CUPINA
Keyword(s):  
Floristic Composition ◽  
Life Forms ◽  
Soil Reaction ◽  
Adjacent Area ◽  
Agrostis Tenuis ◽  
Economic Climate ◽  
Hill Area ◽  
Grazing Period ◽  
The Hill ◽  
Pastoral Value

The study of the grassland type Agrostis tenuis - Festuca rupicola from Valea Bistrei - Otelul Rosu has been necessary due to the great surfaces covered with grasslands from the studied area and due to the social and economic climate characterised by the orientation of the rural community from the adjacent area to agriculture after the failure of the former intensive industry.There have been studied two grassland plots of about 500 hectares, res pectively Gai and Scărisoara. The purpose of this research is to assess the state of the biodiversity and pastoral value of four Agrostis tenuis - Festuca rupicola  grasslands from the hill area. Also, there has been analysed the floristic composition and a series of ecological indexes, respectively humidity, soil reaction, temperature, light, and nitrogen. Other aspects taken in account were the life-forms spectres. The analysed grasslands are placed on Bistrei Valey, in the perimeter of the locality OÅ£elul Roșu, Caraș -Severin County. The researches have been developed during 2010-2012 period. The average elevation level in the studied area is 268 square meters. The soil from the studied area is brown type, with a pH comprised between 4.79 and 5.31. The rainfall amount is about 700 mm and the average temperature is 10 Celsius degrees. The management mode of these grasslands is extensive, the grazing period being 150 days per year. The analysed surfaces are characterised by the lack of the maintenance works, there being present erosion phenomena. The method used for the vegetation analysis is the linear point quadrate method (Daget et Poissonet, 1971), the data being used for the calculation of different ecological indexes and pastoral value. The pastoral value of the species is low in both plots due to the great contribution of the low economical values of the most of the species from the analysed grasslands.

scholarly journals Influence of Habitat Types on Diversity and Species Composition of Urban Flora—A Case Study in Serbia

Plants ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 2572
Author(s):  
Milan Glišić ◽  
Ksenija Jakovljević ◽  
Dmitar Lakušić ◽  
Jasmina Šinžar-Sekulić ◽  
Snežana Vukojičić ◽  
...  
Keyword(s):  
Species Composition ◽  
Vascular Plant ◽  
Habitat Type ◽  
Floristic Composition ◽  
Life Forms ◽  
Urban Habitat ◽  
Residential Areas ◽  
Gamma Diversity ◽  
Habitat Types ◽  
Diagnostic Species

The aim of this study was to investigate the floristic composition and diversity of seven urban habitat types in 24 Serbian cities with different climatic affiliation. In each of the 24 cities, we selected 1 ha plots representing a habitat from one of the following groups: square, boulevard, residential area with compact and with open building pattern, city park, and sites with early and mid-succession vegetation stages. All vascular plant species that occur spontaneously in these plots were observed. Data on the main climatic characteristics were collected for each plot, and data on the life forms were obtained for each species recorded. Diagnostic species were identified for each habitat type analyzed, and alpha, beta and gamma diversity were calculated. A total of 674 taxa were recorded in the studied area. Significant differences were observed in habitats by diagnostic species and by life form representation. The lowest alpha and gamma diversity and the dominance of therophytes were observed in habitat types with intensive anthropogenic impact, whereas the highest number was recorded in mid-successional sites and residential areas with a compact building pattern. The analysis showed that habitat type influences species composition much more than climate.

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