Azarnivand, Hossein

Joneidi, H.

Nikoo, S. H.

Zarechahuki, M.

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress Investigation on Environmental Factors Influencing Distribution of Plant Species (Case Study: Damghan Region of Semnan Province) H. Joneidi University of Tehran, Iran H. Azarnivand University of Tehran, Iran S. H. Nikoo University of Tehran, Iran M. Zarechahuki University of Tehran, Iran Follow this and additional works at: https://uknowledge.uky.edu/igc  Part of the Plant Sciences Commons, and the Soil Science Commons This document is available at https://uknowledge.uky.edu/igc/21/1-5/9 The 21st International Grassland Congress / 8th International Rangeland Congress took place in Hohhot, China from June 29 through July 5, 2008. Proceedings edited by Organizing Committee of 2008 IGC/IRC Conference Published by Guangdong People's Publishing House This Event is brought to you for free and open access by the Plant and Soil Sciences at UKnowledge. It has been accepted for inclusion in International Grassland Congress Proceedings by an authorized administrator of UKnowledge. For more information, please contact UKnowledge@lsv.uky.edu. 瞯 ]208　 瞯 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅰ 　Grasslands/Rangelands Resources and Ecology ——— Ecology of Grasslands/RangelandsInvestigation on environmental factors influencing distribution of plant species ( case study :damghan region of Semnan province)H .Joneidi１ , H .A z arnivand２ ,S H .N ikoo３ ,M .z are chahuki４１ P h .D .Student o f Range management ,Natural Resources Faculty ,University o f Tehran２ A ssistant Pro f . Natural Resources Faculty , University o f Tehran . E‐mail : haz arnivand＠ yahoo .com３ MS .C o f cabmating by deserti f ication , Natural Resources Faculty , University o f Tehran４ A ssistant Pro f . Natural Resources Faculty , University o f TehranKey words : damghan region , working unit , vegetation cover type , environmental factors , soil properties , principal componentsAnalysisIntroduction The understanding of relationship between plant and ecological characteristics in rangeland ecosystems is veryimportant and it can help the managers to manage the rangelands . Many researchers have proven that plant associationsinfluenced by Environmental Factors such as , soil characteristics topographic factors , precipitation and other factor inecosystems( Lents , Ro . １９８４ ; Aeraz & Zayed ,１９９６ ; Bruce ,McCune & James Grace ,２００２ ; Zare , ２００１ ; Jafari , ２００４ ) Thepurpose of current study is to investigate the reasons of plant species distribution in association with environmental factors tofind the most important governing factors in the relation between vegetation cover and environmental factors .　 　Material and methods The study areaincludes a longitudinal profile ex tendingfrom southern slopes of Alborz to HajAligholi Kavir of Semnan province .First ,base maps such as geomorphologicfacies , lithologic map and elevation wasover layed to obtain working units map .Based on the prepared map and fieldsurveys . １０ plots was established inrandomized systematic pattern forvegetation cover sampling . distributionof vegetation cover .Floristic list ,canopycover and density of species weredetermined in each plot .Furthermore , ５profiles were sampled within the plots tostudy soil characteristics in ０‐５０ cmdepth as the effective depth of soil effecton the plant .Consequently , analysis ofinteraction between soil properties andvegetation cover was conducted by usingPC‐ORD ( Version４ ) sof tware based onprincipal components analysis ( PCA) .Results and discussion The resultsshowed that plant type and amongenvironmental factors , elevation , precipitation and slope as the first principal component ( F .P .C ) and percent of sand , loamand ESP as the second principal component ( S .P .C) explain ３９ .２９％ and ２０ .５％ of the vegetation cover variation respectively .In addition , the mentioned factors explain ５９ .７９％ of vegetation cover variation in Damghan region . The result show that byusing PCA analysis we can able to determine the ecological similarity and difference among plant associations and classified themin similar groups as well . The result of this research in Semnan province Explain that there are very important relationshipbetween plant association and unit work( over layed of geomorphologic facies , lithologic and topographic map) , but in erea thatinfluenced by people application( such as agriculture , intense grazing and . . .) we cannot see very significant relation betweenthis cases because of soil disturbance .RefrencesAeraz , M . & Zayed , ( １９９６ ) . Effect of environment factors on the flora of alluvial fans southern Sina , Journal o f A ridEnv ironments . ３２ : ４３１‐４４３ .Bruce ,McCune & James B .Grace ,( ２００２) .Analysis of ecological communities , Published by MjM Sof tware Design .Jafari , M , (２００４) . Investigation on effective soil characteristics on distribution of rangelands species .Zare chahuki , M , (２００１) . Investigation on relation between some plant species and some physico‐chemical characteristics ofsoil .,s17 S14 I, A S 15 1, S 16 -6 -2 A S 13 S 11; S.P.C Axis 2 3 S7 S6 ;1 SI 2 ss s1~" S9 -3 S4 A Axis 1 ss 2 6 FPC 

Investigation on Environmental Factors Influencing Distribution of Plant Species (Case Study: Damghan Region of Semnan Province)

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Investigation on Environmental Factors Influencing Distribution of Plant Species (Case Study: Damghan Region of Semnan Province)

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