Showing 4 results for Species Diversity
Mehdi Heydari, Ali Mahdavi,
Volume 1, Issue 1 (9-2014)
Abstract
Despite the implementation of watershed management projects over a wide area has long history in Iran, but the quantitative assessment of these projects have been neglected. In this study, the effects of watershed management project of Kalan-e-Eyvan in Ilam province from ecological point of view (the relation of vegetation composition with physicochemical soil properties) were investigated. In doing so, four status of watersheds were assessed, namely, status A (implemented area after 5 years in 2010), status B (the witness area without implementation of plan in 2005), status C (the witness area without implementation of plan in 2010) and status D (the area A before implementation of the project in 2005). The results showed that plant species in four statuses were classified into two groups based upon Canonical Correspondence Analysis (CCA) and the species in A, B and C statuses were mostly perennial classified as climax stage species. The results showed a floristic similarity between planed and control areas after 5 yearsturned out. There werea clear differences regarding to vegetation composition, nutrient and saturation percentage (SP) between the area after and before plan implementation. The results of one-way ANOVA indicated significant differences regarding to diversity and richness between four statuses. The results of Duncan-Test showed that the implementation of watershed management project has caused increasing in diversity and richness in planned areas in comparison with non-planned watershed management ones.
Shaieste Gholami, Ehsan Sayad, Hanie Shahghobadi,
Volume 1, Issue 2 (3-2015)
Abstract
One of the main factors affecting sustainable management in the forest ecosystem is the biodiversity conservation. For achieving this purpose, we need to estimate and determine the biodiversity. The efficiency of sampling depends to some extent on plot size in a study. Therefore, a study was conducted in the Zagros forest (Baniloan, Javanrood, Kermanshah) to assess the effect of plot size on the abundance and diversity of tree species. We measured the diversity indices e.g. (Shannon H), richness (Minhinick) and evenness (Sheldon) in our data. These indices were analyzed at 270 sampling points along 3 parallel transects which ran perpendicular to the slope. The distances between transects was 500 m. Each transect comprised 30 sampling points with 3 different sizes of plots (10m×10m-20m×20m and 30m×30m plots). Abundance and diversity of tree species, richness and evenness analyzed by ANOVA and Duncan. The results showed that abundance and diversity increased significantly by increasing the size of the plots. The maximum diversity was seen in 900m2 plot size. At 400 m2 plot, richness was higher than two other plot size. But evenness was not significantly affected by plot size.
Mehdi Heydari, Ali Mahdavi,
Volume 2, Issue 1 (9-2015)
Abstract
In this study, the impact of land use change of forest areas to forest parks on species diversity indices in Chaghasabz Park (Ilam city) has been investigated. For this purpose, three regions in 30-hectare areas were considered, including the area, without, medium and intensive recreation. The field data were obtained using 20 sample plots with each plot covering an area of 400 m2 in a systematic random design (150 m×100 m) in each region. In order to record the herbaceous species, cover percentage for each herbaceous species was recorded in four micro-plots (1.5 m× 1.5 m) that were defined with Domin criterion. In order to evaluate plant diversity, biodiversity indices e.g. Shannon and Simpson and Maguran richness indices were computed. Also, for studying the comparison between the averages of plant diversity indices, Dunken analysis was used. The results showed that in areas without, average and intensive recreation, there were 29, 45 and 21 species respectively. Therophytes were dominant vegetative forms in all three areas. Asperula odorata, Centaurea irritans Wagentz. Marrabium vulgare L., Phlomis olivieri Benth. and Picnomon acarna (L.) Cass were not observed in intensive recreation region. The least shannon and Simpson diversity and richness indices were observed in intensive recreation region, but on the contrary, evenness index was substantial in intensive recreation. We concluded that intense increase of recreation in forest region might cause a loss species diversity.
Mr Yasem Khanmohmadian, Mr Vahid Mirzaeizadeh,
Volume 4, Issue 1 (12-2024)
Abstract
Introduction: Zagros habitat as one of the important biological resources of the country is of special importance in terms of size, plant and animal species, genetic resources, pastures under turbulence, etc. Due to its structural and vegetative characteristics, it has a high diversity of plants. The aim of this study is to achieve the relationship between plant diversity with adaptive factors and also to identify the dominant flora of the region.
Results: The results of a 1700-hectare tour of the region's forests showed that a total of 79 herbaceous species belonging to 66 genera and 32 families, 5 tree species and 6 shrub species were identified in the study area. Among the herbaceous species, Bromus Tectorum (L) are among the plants with 69%, Picnomon Cass with 62%, Geranium Lucidum with 58%, respectively. Hordeum Bulbosum (51%) and Medicago Radiata (49%) were the most abundant in the region, and Qurecus Brantii Linddi, one of the western oak species, has the highest presence and percentage of cover. Allocates. Shannon-Winro Variety Index of plant species was positively correlated with organic matter and nitrogen, so that with increasing these elements, Shannon-Winro Ghana variety increased. Soil organic matter plays a very important role in plant growth and distribution. According to the study, the regeneration of oak and wild cherry seeds with nitrogen and potassium showed a positive correlation. Nitrogen and potassium are the most important nutrients in the soil, which play an important role in plant growth.
Overall Conclusion: According to studies conducted among different plant species in this section, the species have edible, industrial and conservation values, so protect these existing areas and try to revive and develop them. It is a necessity today. Implementation of the management of the governing unit on it is witnessing an increase in the richness and diversity of vegetation in the region and subsequently prevent any destructive floods in the region. Destruction of forests, vegetation, soil, etc. can play an effective role. Proposed programs are a comprehensive management plan and revised plans that must be updated every few years according to the conditions of the region, so the proposed programs, including Better management of livestock farmers in the region and strengthening the protection level of the region will be a prerequisite for research and educational, research and recreational programs.
Innovation aspects:
1- Investigating biodiversity in the forests of northern Ilam
2- Determining the relationship between plant biodiversity and adaptive conditions in the forests of northern Ilam
