فهرست مقالات Mountainous rangeland

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  1 - Investigation of Stability and Relationships between Species Diversity Indices and Topographical Factors (Case Study: Ghorkhud Mountainous Rangeland, Northern Khorasan Province, Iran)
  Negin Nodehi Mousa Akbarlou Adel Sepehry Hasan Vahid
  One of the main objectives of ecosystem management is to preserve the speciesdiversity. Many researchers regard higher species diversity as the stability of ecologicalsystems. The aim of this study is to investigate the stability and relationships betweentopographical f چکیده کامل

  One of the main objectives of ecosystem management is to preserve the speciesdiversity. Many researchers regard higher species diversity as the stability of ecologicalsystems. The aim of this study is to investigate the stability and relationships betweentopographical factors with diversity indices in Ghorkhud mountainous rangeland innorthern Khorasan province, Iran. For data sampling (2012), land units were specified.Floristic list was prepared and minimal area was determined based on the nested plot(Braun-Blanquet method). 120 plots of 1m2 were selected and within each plot, thepresence of species and cover percent were estimated. For data analysis and meanscomparison of species diversity between the study sites, One-way ANOVA and Duncantests were used. The species diversity was investigated using numerical indices andstability of the habitat was determined using parametric indices. The results showed thatspecies diversity was decreased due to the increased altitude. Diversity indices wereincreased by the increased slope percent. Also, eastern slopes had the most diversity ascompared to the other driving directions since the communities with high and lowdiversities generally follow the Log-Normal and Geometric models, respectively.According to our results, the areas with light slopes, middle altitudes and north and westdirections followed the Log Normal distribution which had the most stable levels. It wasconcluded that the area with Log-Normal model represents a relatively stable communitieswith medium to high species richness. پرونده مقاله
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  2 - Systemic Management of Mountainous Rangeland Ecosystem, Case Study: The Javaherdeh Rangeland of Ramsar
  Mohammad Hassan Jouri Dina Askarizadeh Vahid Rahimi Mohammad Mahdavi
  Mountainous rangeland ecosystems have a highly delicate position in ecologic areabecause of severe environmental conditions and having wildlife and livestock. Knowing andrealizing the biotic and abiotic components, which have an interaction with each other in thisecosys چکیده کامل

  Mountainous rangeland ecosystems have a highly delicate position in ecologic areabecause of severe environmental conditions and having wildlife and livestock. Knowing andrealizing the biotic and abiotic components, which have an interaction with each other in thisecosystem, perform the most important role in to desirable management of it. The systematicmanagement is one of the managing features such as modern approach for land managementand suitable use of upland ecosystems. To reach that, mountainous rangelands of Javaherdeh(Ramsar) via 1:25,000 scale map were selected. Density, rangeland conditions, vegetationcover, gravel and grit were determined by Superficial and modified six-factor methods, ArcGIS v.9.3 software was employed to achieve land form map which was obtained by thecombination of altitude, slope, and slope aspect maps. First, basic and first environmental unitmaps were changed with land form map into soil type map, and first basic map intovegetation type map. The proposal map of systematic management of area was associatedwith final environmental unit map into landuse map via their attribute table. The establishedproposal map shows accurate position of different future land uses on the basis of currentecological capabilities of areas. Around Javaherdeh village is suitable for extensive outdoorrecreation (7.59%) and appropriate for the grazing of livestock (62.22%). Some areas(20.07%) also should be protected because of landslides and debris formation. پرونده مقاله
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  3 - Comparison of Measurement Indices of Diversity, Richness, Dominance, and Evenness in Rangeland Ecosystem (Case Study: Jvaherdeh-Ramesar)
  Negar Davari Mohammad Hassan Jouri Ali Ariapour
  The diversity and richness of species are of important components to evaluate the health of ecologic system of rangelands. This research was conducted to investigate the biodiversity in riparian and neighboring areas via comparison of indices in Javaherdeh rangeland of چکیده کامل

  The diversity and richness of species are of important components to evaluate the health of ecologic system of rangelands. This research was conducted to investigate the biodiversity in riparian and neighboring areas via comparison of indices in Javaherdeh rangeland of Ramsar. Plot-transects was randomly used to estimate diversity, richness, dominance, and evenness indices in two regions. Multi Linear regression method was used to analyze the relationships of three indices to rangeland condition. Results of floristic list showed that there were 66 species belong to 19 families and 56 genera. Gramineae and Compositae families with values of (23.24 and 12.1%) had the highest and Boraginaceae and Hypolepidaceae with 2% had the lowest frequency, respectively. Result showed that richness species index in riparian area and diversity index in neighboring area had high correlation with the rangeland conditions. Hence, ecologic management could be used as a tool for evaluation of indices as reflectors of disturbance in rangeland. پرونده مقاله