بررسی اکو-فیتوسوسیولوژی پوشش گیاهی استان همدان(فازاول: منطقه کیان نهاوند)

Existence of variation in formations and flora on one part, and having kind of vegetation of Zagrican vegetations with characteristic element of Quercus brantii in other hand,enjoy Kyan region from manifest characters. Such characters was main reason for selection and survey of this region. This region is located in 17 KM. sorth-western of Nahavand city, in limits of Gamasiab basin,sub-basin of Gusheh in Nahavand and between 34:8:2f - 34:9;40" North latitude and 48:12:55" - 48:14:9"East longitude. Area of sub-study region is about 340 hectare. Minimum altitude is 1615 M and maximum altitude is 2080 M. from sea level. Determination site of installation of releves was carried out on base of Eco-phytosociology method.So that employ of Physionomic -Floristic-Ecological criterion posibled determination of formations, motonon levels ( association individuales )and site of installation of releves in each association individue.In total ,148 releves were installed in sub-study region. Determination of minimal area in each association individue,were accomplished with using of area-species method and on base of area-species curve and cain method. Data (include plants, soil and ecologic factors) were collected and noted in each of releves for recognization and analyse. Analyse of data were carried out with using of Sorenson,Jackard and Anaphyto softwares. In this of softwares were used from Sorenson ,Jackard,A.F.C and C.A.H methods. With examination and comparison of results of data analyse following results were obtained: 1-Determination of 5 main formation include Hydrophyle formation with Phragmites australis,rocky formation with Paritaria judaica,Stachys kurdica,waterway formation with Mentha longifolia,Juncus inflexus,rangeland formation with Aegilops triuncialis,Astragalus gossipinus and forest formation containing 2 sub-formations (a):Quercus brantii (b) :Crataegus pseudoheterophylla 2-Determination of phytosociologic units: a)19 association include: Lotetum comiculati, Phragmitetum australis ,Lythreto salicariae-Pulicarietum dysentricae , Ononieto spinosae-Juncetum inflexi, Menthetum longifoliae, Corneto australis-Prunetum divaricatae) Platanetum orientalis, Viteto sylvestris-Juglanetum regiae ,Roseto caninae-Crataeginetum pseudoheterophyllae, Rubo sanctae-Fraxinetum excelsior, Brometo danthoniae-Quercetum brantii) Cerasetum microcarpae subsp.microcarpae, Crataeginetum aroniae, Cerasetum microcarpae subsp. turtosae, Parietarieto judaicae-Stachysetum kurdicae ,Festucetum ovinae, Ziziphoretum clinopodioides, Crataeginetum ponticae) Taniathereto criniti-Astragaletum gossipini b)9 aliance include: Parietarion , Crataeginion) Prono-Rubion) Quercion, Phragmitetion, Juncion , Menthion , Fraxinion) F estuco- Bromion c)7 order include: Quercetalia ,Juncetalia) Phragmitetalia ) Crataeginetalia, Pronetalia Brometalia ) Parietarietalia d)6 class include: Quercetea, Parietarietea) Astragaletea , Festuco-Brometea, Phragmitetea) Juncetea 3-Determination of flora include: 367 species,242 genus and 61 family 4-Preparation and presentation of maps include:maps of main formations and sub-formations and associations map of sub-study region.