Showing 6 results for خراسان
Volume 8, Issue 2 (10-2009)
Abstract
The extent of area is about 3571 hectars. It is part of Hezarmasjed in north- western Kalat. The average maximum temperture is 20.8 in August and the minimum temperture is -9 in January. A floristic study was done for the area plants and then biological forms and plant chorotypes were identified. In this research, 65 families, 282 genera and 404 species were identified, The largest plant family is Asteraceae with 52 genera and 82 species and the largest genera is Astragalus of Papilionaceae with 19 species. Chief biological forms are: Hemicryptophytes , Therophytes and Cryptophytes. Most of the species (54.45%) belong to Irano -Turanian region.
Volume 8, Issue 4 (11-2010)
Abstract
Caprini is one of the largest sections belonging to the genus Astragalus with 280 species. Astragalus Sect. Caprini are revised. This section has 171 and 115 species in Flora Iranica area and Iran, respectively. During the work, plant specimens preserved in Ferdowsi University of Mashhad, Herbarium (FUMH) were indentified from different regions of Khorassan provinces. Also, distribution of regions in different parts of this section are presented. Based on this study, 37 species of this section are known in Khorassan provinces. A. kushkensis in Flora Iranica has been recorded from Turkmenistan and Afghanistan and is reported from NE. of Khorassan, Torbate – jam, Saleh Abad as a new record for the flora of Iran. This plant is glabrous and has 18 – 22 pairs of leaflets. Leaflets are narrowing ovate and glabrous. Distribution regions of these taxa in different parts of Khorassan province are given.
Volume 9, Issue 3 (10-2010)
Abstract
A study of flora and population changes in a sample paddy field in Kalat (Mashhad) were done from May to September 2007 in four stages. Physical and chemical factors such as EC, pH and temperature were measured. Totally, 23 species, 8 genera and 5 families were identified. The identified species were: Chroococcaceae: Chroococcus, Gloeothece, Aphanothece Oscillatoriaceae: Oscillatoria Rivulariaceae: Calothrix Nostocaceae: Cylindrospermum, Nostoc, Anabaena Scytonemataceae: Scytonema. Regarding the heterocystous species, the most abundant cyanobacteria belong to genus Nostoc. pH in 4 collection were alkaline and did not show significant difference. Colony number did not indicate direct relation with pH despite of EC. Maximum colony number was seen in minimum temperature.
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Volume 9, Issue 3 (10-2010)
Abstract
This study was carried out in Kalat highlands of Gonabad, Eastern Iran, located in geographical position of 34º 6´ to 34º 16´ N and 58º 25´ to 58º 35´ E with the altitude of 1100 to 2830 m.a.s.l. The mean annual precipitation and temperature are 143.2mm and 17.2ºC, respectively. Species richness, evenness and species diversity, diversity and related models, diversity based on the rank/abundance plots as well as methods of diversity ordering were considered in three elevation zones including low, intermediate and high altitudes and in the four slope aspects. Species richness indices in the intermediate zone were more than those in the low and high altitudes. The intermediate zone showed the highest species diversity as well as the highest evenness among the zones. North aspect showed the highest species richness and lowest species diversity and evenness. The highest diversity and evenness were observed in the south and south and west aspects, respectively. The low altitude zone followed lognormal distribution however intermediate and high altitude zones do not fit any of the models. Species abundance patterns of the north and west aspects followed both lognormal and logarithmic models with a shift from being lognormal to logarithmic model. The intermediate altitude zone and the south aspect had more flattened rank/abundance plot therefore they have been more diverse than the others. The same was observed by using diversity profiles.
Javad Mohammadi, Hasan Zaree Maivan, H Ejtehadi, ,
Volume 15, Issue 1 (4-2015)
Abstract
Vegetation of Kasf forest with an area of over 12 ha, located in the east-west direction at a distance of 20 kilometers north of the city of Bardaskan, between 57° and 52' and 30" to 58° and 00' and 00" East longitude and 35° and 22' and 30" to 35° and 30' and 00" North latitude, in a mountainous arid region with a minimum and maximum temperature of -10 and +45° C , respectively and average annual precipitation of 155 mm, at an altitude of about 1600 m above sea level with 15% slope was studied using floristic method 2 years after fire and life forms and geographical distribution of plant species were determined. Sixty nine plant species belonging to 29 families (25 Dicots, 3 monocots and one gymnosperm). The largest families were the mint (Lamiaceae) with 11, Compositeae (Asteraceae) with 9 and carnation family (Caryophyllaceae) with 5 species. The life forms included Therophytes with 36% (25 species), Hemicryptophytes 29% (20 species), Chamaephytes 16% (11 species), Phanerophytes 13% (9 species) and cryptophytes with 6% (4 species). The high percentage of Hemicryptophytes indicated dominance of cold mountainous climate and the presence of Asteraceae species such as harmala (Peganum harmala) showed sever disturbance had taken place in the region and thus, the need for administering greater ecological care and employing more extensive environmental supervision and management was identified.
Volume 18, Issue 49 (11-2006)
Abstract
Anthemideae is one of the largest tribes of Asteraceae. This investigation is based on a study on about 700 specimens belong to Anthemideae in Khorassan. During of this study two taxa were recorded, Tanacetum kotschyi, Achillea millefolium subsp. millefolium for the first time for the Flora of Khorassan, Iran.Tanacetum budjnurdense was collected after recording the sample type in 1950 from different location for the first time. Distribution maps and key to the genera and species occurring in Khorassan were finally provided.
