جستجوی مقالات مرتبط با کلیدواژه "chaharmahal" در نشریات گروه "اکولوژی"

Globally, bird populations are experiencing a significant decline due to disruptions caused by human activities. The Chahakhoor International Wetland, as one of the important bird areas, is located in Chaharmahal and Bakhtiari Province. In this study, we evaluated the habitat quality of Chahakhoor over an 11-year period using the InVEST model. Land use and land cover maps for 2013, obtained from the Forests and Ranges Organization, and for 2024 were prepared using Landsat 9 image classification, employing a supervised method and the random forest algorithm. The results showed that habitat quality for waterbirds in this wetland declined by approximately 20% from 2013 to 2024. Additionally, changes in land use and land cover indicated reductions in water resources, dense vegetation, and average pasture land, while areas allocated for villages, cities, roads, and agriculture increased. Overall, our findings suggest that the decline in the abundance of many surveyed waterbird species in Chahakhoor Wetland is likely associated with the decline in the habitat quality over the 11-year period. This highlights the urgent need for conservation initiatives aimed at restoring and protecting this wetland, which supports bird populations.

In forest ecosystems, forest production, storage and carbon flow are calculated based on biomass measurements. The aim of this study was to compare the biomass and carbon stock of the above-ground, litter and soil in the oak decline and control plots in Chaharmahal and Bakhtiari province. Four one-hectare sample plots were selected in the healthy (control) and declined stands of oak. Then quantitative information of all trees were measured. Allometric equations were used to calculate the above-ground biomass and carbon stock. Ten microplots were established in each sample plot and all litters were collected. Wet and dry weights and carbon content of the litter samples were measured. To measure soil organic carbon, five soil samples were taken in each sample plot. The results showed that above-ground biomass in the control and decline sample plots were 31.4 and 15.8 tons/hectare respectively. Also, the average of the above-ground carbon stock in the control and decline plots were 15.1 and 7.7 tons/hectare, respectively. The mean of litter carbon in the control plots was 1584.1 kg/ha and in the decline plots was 1148.6 kg/ha. The amount of carbon, nitrogen, phosphorus and soil moisture content showed a significant difference between the control and decline plots. The results of this study indicated significant changes in biomass, carbon stock and soil in declined stands of oak which may cause irreparable damage to the Zagros forest ecosystem, in the long term. This issue highlights the need for the attention of managers and decision makers of natural resources, regarding the provision of management solutions to control this phenomenon.

Periphyton communities serve as vital component of stream ecosystems and they are the principal primary producers of the aquatic river ecosystems. Periphyton is useful as biological indicator of water pollution. Taxonomic diversity and abundance of periphyton depends on a range of factors like; temperature, disolved oxygen and nutrient availability. Yet, no study has been conducted on physicochemical parameters and periphyton composition of the headwater of the Beheshtabad River. Therefore, the present study aims to determine the influence of physicochemical parameters on periphyton composition of the Beheshtabad headwater stream ecosystem, which is prone to anthropogenic pressures. Sampling will be conducted monthly from seven stations along the reservoir. A monthly investigation was carrird out at seven sites over the period October 2015 to September 2016. Accordingly, density of periphyton communities was lowest in winter, with highest production was in summer. Considering the density of periphyton communities along with the dominance of the genus diatoms, the genus Naviculla showed the highest distribution, so that it was present at all stations and in all stages of sampling and constituted the dominant density.

Predicting the potential distribution of plants in response to climate change is essential for their conservation and management. This study aimed at predicting the effect of climate change on the geographical distribution of Pistacia atlantica in Chaharmahal & Bakhtiari province in the central Zagros region. In this study, we used 19 Bioclimatic variables derived from rainfall and temperature and three physiographical variables as the input of maximum entropy model (MaxEnt). The results showed that annual precipitation, annual temperature range and seasonal temperature have played the most important role in habitat suitability of this species. The results of the model showed that 14.7%, (2413.7 km2) of in Chaharmahal and Bakhtiari Province for the Pistacia atlantica have had high habitat suitability. Under RCP4.5 and RCP8.5 climate scenarios, Pistacia atlantica might lose (Respectively 8.11% and 11%) of its climatically suitable habitats due to climate change factors by 2050. Considering the high accuracy of the maximum entropy model in predicting the distribution of the studied species (AUC = 0.92), results of this study can be used in planning, conservation and rehabilitation of Pistacia atlantica.

Interrelationships between plants are affected establishment and survival, as a result, knowledge of how these relationships occur can be used for the maintenance of species and improvement and management of rangelands. This study was conducted to evaluate the effect of Astragalus microcephalus on index vegetation under the canopy in semi-steppe rangeland of protected area in Tange-sayad. For this purpose, percentage of vegetation cover under the canopy of this species and its open space adjacent was measured using a flexible plot along the 100 meters transect. The results showed that 30 species under the canopy of Astragalus microcephalus and 33 plant species in the open space adjacent. In the under canopy of Astragalus microcephalus 6 exclusive species such as Chaerophyllum macropodum, Onobrychis gaubae, Salvia ceratophila, Stachys pilifera and Artemisia aucheri existed that mostly related to perennial, palatable and pharmaceutical plants. In contrast, open space exist 9 exclusive species including Centaurea virgata, Hypecum pendulum, Clypeola aspera, Roemeria refrecta and Xeranthemum annum that mostly related to invasive and annuals species plant. Generally, the vegetation index under canopy of Astragalus microcephalus due to moderate grazing livestock in the region less affected to mechanical facilitating of Astragalus microcephalus but the facilitating role of Astragalus microcephalus in preserving of valuable plant species is highly visible.

One of the recent strategies in most countries in the field of recent economic growth has been a particular concern, tourists. Among all types of tourism, ecotourism is more compatible with sustainable development. Iran, due to the great extent, climatic diversity etc. has unique capability in the field of ecotourism. Chaharmahal and Bakhtiari province has high ability in this regard. Gandoman wetland in this province, according to the beautiful scenery is a great potential for the development of ecotourism. In this study, we tried using SWOT, AHP and ANP strategies for the development of the wetland ecotourism that could be provided. Analytic descriptive Methods and survey analysis of 20 tourism experts were used. The results (year 2012 – 2013) showed that: A total of 45 strengths and opportunities, with a score of (4.19) as the advantages and disadvantage and threaten with a score of 47 weight (3.21) as there are limitations wetland ecotourism development, Then, according to the results SWOT; to provide 6 strategy for each of four strategies (SO, ST, WO, WT) were measured. Since the proposed strategy did not have the same importance, so by using AHP model of each four proposed strategies; the best strategies were selected. These strategies include of competitive strategy-aggressive (SO) (Provision of facilities and services based on the needs assessment, etc.), Diversity strategy (ST) (policies to prevent an increase in rates land), the strategy review (WO) (adopt security measures to protect wetland reserves with the help of authorities, etc.) and defensive strategies WT (enjoying modern technology and harmony with the environment, etc.). Finally, using AHP to prioritize the implementation of each four strategies that SO strategy priority, WT The second priority, WO third priority, and eventually won the fourth priority ST.