Investigation of Stability and Relationships between Species Diversity Indices and Topographical Factors (Case Study: Ghorkhud Mountainous Rangeland, Northern Khorasan Province, Iran)
الموضوعات :
Negin Nodehi
1
(Range Management, Gorgan University of Agricultural Sciences and Natural Resources
Sciences, Gorgan)
Mousa Akbarlou
2
(Gorgan University of Agricultural Sciences and Natural Resources Sciences, Gorgan)
Adel Sepehry
3
(Gorgan University of Agricultural Sciences and Natural Resources Sciences, Gorgan)
Hasan Vahid
4
(Natural Resources Organization, North Khorasan)
الکلمات المفتاحية: Diversity, Topographic factors, Ghorkhud mountainous rangelands,
ملخص المقالة :
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.
Literature Cited
Archibold, O. W., 1995. Ecology of world vegetation. Chapman and Hall Inc. London, 509 p.
Bharali, S., Paul, A., Khan, M. L. and Singha, L. B., 2011. Species diversity and community structure of a temperate mixed rhododendron forest along an altitudinal gradient in West Siang District of Arunachal Pradesh, India. Nature and Science, 9(12): 125-140.
De Martone, M., 1942. Geographie universelle, Vol. I, 140.
Dengler, J. Janisova, M. and Rusina, S., 2008. World grasslands and biodiversity patterns, 29: 3-5.
Ebrahimi Kebria, KH., 2002. Investigated the effects of topography and vegetation and diversity grazing on the cover percent changes in the sub basin Sefidab Haraz, M.Sc. thesis, University of Mazandaran, 82 p. (In Persian).
Fakhimi Abarghui, A., Mesdaghi, M., Gholami, P., Naderi Nasrabadi, H., 2011. Effect of some topographic characteristics on the plant diversity (Case Study: Yazd Nadooshan steppe grasslands). Iranian Jour. Range and Desert Research, 18(3): 419-408. (In Persian).
Grytness, J. A. and Vetaas, O. R., 2002. Species richness and altitude: A comparison between along the Himalayana altitudinal gradient, Nepal, the American Naturalist. 159(3): 294-304.
Hammer, Q., Harper, D. A. T. and Ryan, P. D., 2001. PAST: Paleontological Statistical Software Package for Education and Data Analysis, Palaeontologia Electronica, 4(1): 9.
Hosseini, A., 1995. Investigated of plant communities Mirzabylo and Almeh Golestan National Park. Range management master's thesis, Tarbiat Modarres University, 128 p. (In Persian).
Hund, K. C., 2002. The effect of slope aspect on environmental conditions and vegetation, California state science fair.
Keshtkar, H., 2007. Investigated the ability of satellites to map land cover (case study: Ghorkhud protected area in northern Khorasan province). Range management M.Sc. thesis, department of natural resources, Tehran university. 141 p. (In Persian).
Magurran, A. E., 1988. Ecological Diversity and its Measurement. Chapman and Hall, London.
Magurran, A. E., 2003. Measuring Biological Diversity, Wiley-Blackwell, London, 260 p.
Mesdaghi, M., 2003. Vegetation description and analysis. Mashhad University Publications, Mashhad, Iran 287P. (In Persian).
Mesdaghi, M., 2005. Plant ecology, Jahad Daneshgahi of Mashhad press, Mashhad, Iran 187 p. (In Persian).
Mirdavoodi, H. R. and Zahedi Poor, H., 2005. Determination of suitable species diversity model for Meyghan playa plant association and effect of some ecological factors on diversity change. Pajouhesh & Sazandegi, 68: 56-65. (In Persian).
Motomura, I., 1932. On the statistical treatment of communities. Zool. Tokyo, 44: 379-383.
Oliveira, F. F. and Batalha, M. A., 2004. Lognormal abundance distribution of woody species in a cerrado fragment. Revista Brazil. Bot., 28(1): 39-45.
Stiling, P., 2000. Ecology. Theories and Applications. Prentice Hall Inc. 395 p.
Thomas, G., 2000. BIO-DAP: A program for Ecological Diversity and its measurement. Parks Canada and Fundy National Park.
Vandermeer, J. H., 1981. Elementary mathematical ecology. Wiley Publishers, 294 p.
