12 research outputs found
A floristic study of the Sorkhankol Wildlife Refuge, Guilan province, Iran
Sorkhankol Wildlife Refuge with an area of 1209 ha is located in the central part of Anzali Wetland. In total, 81
species belonging to 35 families and 68 genera were surveyed and identified on the basis of a floristic study from
July 2013 through June 2014. The largest families are Poaceae (11 taxa), Asteraceae (8 taxa) Apiaceae, Brassicaceae
and Cyperacae (5 taxa). The dominant life forms were cryptophyte (43.21%), followed by the therophytes (39.51%),
hemicryptophytes (13.58%) and phanerophytes (3.7%). From the chorological point of view, the largest proportion
of the flora belongs to the pluriregional elements (44.44%). A comparison between our study and other parts of the
Anzali Wetland showed that Sorkhankol was not particularly species-rich. Currently, the major threats to the
research area include eutrophication, pressure from boating and fishing activities, invasion of exotic species and
other human induced disturbances
Floristic, life form and chorological studies of the Abshar protected area, Shirgah, Mazandaran Province, north of Iran
The Abshar protected area with 3639 ha and an altitude ranging from 400-855 m a.s.l. is one of the forest areas that
due to its topography is covered by Carpinus betulus, Parrotia persica and Diospyros lotus speices. The floristic study
of this area is long with sampling plots. The floristic-physiognomic investigation showed that flora of this region
included 99 plant species which belonged to 81 genera and 49 families. The largest family was Rosaceae with 10
species. Classification based on life form spectrum indicated that geophytes (31.31%), phanerophytes (29.29%),
hemicryptophytes (25.25%) and therophytes (14.14%) comprise the plants in the studied area. The results of
chorological studies showed that the chorotype form Euro-Siberian elements (32 taxa, 32.32%) were the most
important phytochorion in this area. Long period of wetness during the growing season and relatively high annual
precipitation are the reasons of the high proportion of geophytes existence in the studied area. Phytogeographical
comparison of the Abshar protected forest and the other forests in north of Iran identified two peaks in phytochoria
curves, one in Euro-Siberian and the other one is in the Pluriregional elements
Floristic characteristics of the Hyrcanian submountain forests (case study: Ata-Kuh forest)
Ata-Kuh forest, a preserved area within Hyrcanian relict forests, with an area of 700 ha is located in north of
Iran. Based on floristic studies from 2011 through 2012, 194 vascular plant species were identified belonging to
143 genera and 66 families. Among our samples, 24 taxa were endemic to Hyrcanian area. The largest families
in the area were Rosaceae (10.3 %), Poaceae (9.7 %), Asteraceae (6.7 %), Fabaceae (5.6 %) and Lamiaceae (5.1
%). The genera represented by the greatest number of species were Rubus (8 species), Carex (7 species), Viola
and Euphorbia (each with four species). Classification based on life form indicated that geophytes comprise the
largest proportion of the plants in the studied area. From the chorological point of view, the largest proportion
of the flora belonged to the Euro-Siberian elements (60 taxa, 31.1%). In this study, a comparison was
performed between our results and other studies on the northern Iranian forests with respect to life forms and
phytochoria. Psilotum nodum is reported here again from a new locality in North Iran, indicating the old
Tertiary history of this forest
Anatomical study on some species of genus Cyperus in northern Iran
Comparative anatomy of six taxa of Cyperus distributed in the north of Iran was studied. The investigated
species are: C. difformis, C. distachyos, C. fuscus, C. pygmaeus, C. odoratus subsp. transcaucasicus, and C. rotundus.
Cross sections of stems and leaves of these species were examined. The following characters were determined to be
taxonomically informative: cross-section shape of the aerial stem, presence or absence of vascular bundle in the central
part of stem cross-sections, the diameter of mesophyll and air cavities in stem and leaf cross-sections. Cyperus fuscus and
C. difformis differ from other studied species in having large air cavities in stem and leaf cross section. Our results show
that comparative anatomy of lateral stems and leaves may provide additional characters to be considered in taxonomic
studies within this genus.Проведене порівняльне вивчення анатомії шести таксонів роду Cyperus, поширених на півночі Ірану: C. difformis,
C. distachyos, C. fuscus, C. pygmaeus, C. odoratus subsp.
transcaucasicus і C. rotundus. Досліджували поперечні зрізи стебел і листків цих видів. Таксономічно важливими
визначені такі ознаки: форма поперечного зрізу повітряного стебла, наявність або відсутність судинного пучка
в центральній частині поперечних зрізів стебла, діаметр
мезофіла і повітряних порожнин в поперечних зрізах
стебел і листя. Cyperus fuscus і C. difformis відрізняються
від інших вивчених видів наявністю великих повітряних
порожнин в поперечних зрізах стебел і листків. Наші
результати показують, що порівняльна анатомія бічних
стебел і листків може забезпечити додаткові ознаки для
таксономічних досліджень цього роду.Проведено сравнительное изучение анатомии шести таксонов рода Cyperus, распространенных на севере Ирана:
C. difformis, C. distachyos, C. fuscus, C. pygmaeus, C. odoratus
subsp. transcaucasicus и C. rotundus. Исследовали поперечные срезы стеблей и листьев этих видов. Таксономически важными определены следующие признаки: форма
поперечного среза воздушного стебля, наличие или отсутствие сосудистого пучка в центральной части поперечных срезов стебля, диаметр мезофилла и воздушных
полостей в поперечных срезах стеблей и листьев. Cyperus
fuscus и C. difformis отличаются от других изученных видов наличием больших воздушных полостей в поперечных срезах стеблей и листьев. Наши результаты показывают, что сравнительная анатомия боковых стеблей
и листьев может обеспечить дополнительные признаки
для таксономических исследований этого рода
Relationships between Vegetation and Ecological variablesin Palangan Habitat, Aghdagh Protected Area of Ardabil Province
Knowledge about plant communities and their relationships with ecological factors is one of the most important issues in conservation ecology particularly in the recent decades. The current investigation aimed to study the vegetation ecology of Palangan habitat in Aghdagh Protected area, Ardabil province. In order to collect species and environmental data, a total of 45 plots along a 1500 m elevational gradient and an interval of 100 m were surveyed. Braun-Blanquet scales were used to evaluate vegetion cover of each plot. Floristic and ecological characteristics of the area were studied along elevational gradient using DCA ordination and TWINSPAN classification methods. Four vegetation groups detremined in TWINSPAN were also identified in the DCA diagram and their species and environmnetal characters have been evalyated by one-way ANOVA. Based on these anlayses, altitude and slope were the most important ecological factors affecting the vegetation of the area. Endemicity values are not significatly changed among different altitudinal belts, but in stead, the number of therophytes and plants with wide distributional ranges are significam,ty different along elevation. The relatiohsip between altitude and species richness, like to other mountainus systems, show almost unimodal pattern which peaks at 1800 m