Les pelouses xérophiles d'altitude du flanc sud de l'Alborz central (Iran)

Klein, Julie

doi:10.1127/phyto/15/1987/253

Cited by 23 publications

(20 citation statements)

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“…This is, however, still within the extremes of the plots of Klein & Lacoste (), which vary from 5 to 400 m². Our target vegetation types do not extend to lower altitudes because the scree grounds of the sub‐alpine zone are almost fully occupied by communities of the class Prangetea ulopterae Klein nom. inval., i.e.…”

Section: Methodsmentioning

confidence: 99%

“…Phytosociological studies of the alpine zone of Iran were carried out only in Central Alborz, and the syntaxonomic inventory of Iran is still far from complete. A first syntaxonomic treatment of the sub‐alpine and alpine vegetation of Central Alborz was published by Klein (, , ), who introduced three classes, which are, however, not validly published: ‘ Prangetea ulopterae ’ (sub‐alpine heaths and tall herb vegetation), ‘ Onobrychidetea cornutae ’ (lower alpine thorn cushion vegetation) and ‘ Oxytropidetea persicae ’ (higher alpine dwarf shrub vegetation). Noroozi et al.…”

Section: Introductionmentioning

confidence: 99%

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Phytosociology and ecology of the high‐alpine to subnival scree vegetation of N and NW Iran (Alborz and Azerbaijan Mts.)

Noroozi

Willner

Pauli

et al. 2013

Applied Vegetation Science

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Questions:The vegetation of high-alpine and subnival scree habitats in Iranian mountains has been poorly investigated so far despite the large variety of narrowly distributed vascular plant species and the expected vulnerability of these ecosystems to global warming. Which plant communities occupy these ecosystems and what is their syntaxonomic position? Which environmental factors determine the species composition of these habitats?Location: Alborz and Azerbaijan Mountains in N and NW Iran.Methods: A total of 141 phytosociological relev es were collected from 3200 to 4800 m a.s.l. This data set was classified using TWINSPAN, and the numerical classification was translated into a syntaxonomic system. Floristic differences between vegetation types were evaluated with detrended correspondence analysis (DCA). We determined the means and SD of measured environmental and vegetation parameters for all associations. Differences in the major environmental parameters among associations and alliances were analysed using ANOVA and post-hoc tests. Moreover, we determined the mean cover percentage of life forms in all associations.Results: All high-alpine and subnival scree communities are arranged in one class (Didymophyso aucheri-Dracocephaletea aucheri), two orders (Physoptychio gnaphalodis-Brometalia tomentosi, Didymophysetalia aucheri), three alliances (Elymo longearistati-Astragalion macrosemii, Erigerontion venusti, Didymophysion aucheri) and ten associations, which are new to science, except for one association. The territory of the class extends from Alborz to NW Iran and probably to E Anatolia, Transcaucasia and the Zagros Mountains. Altitude, aspect and edaphic qualities are the major ecological factors influencing the species composition and vegetation mosaic. Conclusions:Our study introduces a formal syntaxonomic classification of the scree vegetation at high altitudes in Iran, thus providing a scheme for ongoing ecological surveys and monitoring programmes to assess the impacts of climate warming and of human land use on these unique ecosystems.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Phytosociology and ecology of the high‐alpine to subnival scree vegetation of N and NW Iran (Alborz and Azerbaijan Mts.)

Noroozi

Willner

Pauli

et al. 2013

Applied Vegetation Science

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“…Such growth forms are known from Irano-Afghanian mountains and Mediterranean mountain regions, as well as from wind-swept areas of southern South America. This formation is adapted to the intensive radiation, to dry and windswept sites (Rauh 1939;Gams 1956;Breckle 1983;Hager 1984;Hager and Breckle 1985;Kürschner 1986;Klein 1987). Additionally they are rather resistant to grazing.…”

Section: Life Formsmentioning

confidence: 96%

“…Based on our ongoing research on the alpine vegetation of Tuchal Mountain at Central Alborz (Noroozi and Akhani, in press) and Klein (1982Klein ( , 1984Klein ( , 1987Klein ( , 1988Klein ( , 1991Klein ( , 2001 an overview of major vegetation units is shown here. Some major phytosociological units have been distinguished by Klein including Prangetea ulopterae, Onobrychydetea cornutae, Oxytropidetea persicae, Trachydietalia depressae, Catabrosetalia parviflorae.…”

Section: Vegetationmentioning

confidence: 98%

“…Buhse (1899a, b) and Gilli (1939Gilli ( , 1941 have published studies on Alborz Mountains vegetation. Some phytosociological research in the subalpine and alpine belt which aimed to establish of a syntaxonomic system has been done by Klein (1982Klein ( , 1984Klein ( , 1987Klein ( , 1988Klein ( , 1991Klein ( , 2001 and Klein and Lacoste (1994, 1996. The vegetation and flora of Tuchal mountains is under active investigation by the Research Project ''Geobotanical studies in different parts of Iran'' including some M.Sc.…”

Section: Introductionmentioning

confidence: 99%

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Biodiversity and phytogeography of the alpine flora of Iran

2007

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Iran is a mountainous country. Zagros and Alborz mountains reach altitudes of more than 4,000 m. Alpine regions are above timber-line, which is not easy to recognize, since aridity is prominent in most regions. The alpine zone in Alborz lies between 3,000 and 4,000 m, the nival zone is above 4,000 m, locally varying by some hundred meters. A first evaluation of vascular flora shows that 682 species belonging to 193 genera and 39 families are known from the alpine zone of Iran. The alpine zone is commonly characterized by many species of hemicryptophytes and thorny cushions. Species numbers decline very strongly with increasing altitude. In this paper biogeographical patterns of the alpine flora of Iran have been discussed and distribution maps of 44 species are illustrated. New data indicate a transitional situation of the Iranian mountains between Anatolia/ Caucasus and the Hindu Kush, but with a strong own element with high endemism and remarkable relict species. Ca. 58% of the alpine flora of Iran are endemic and subendemic. The Zagros Mountains harbor high endemism which justify considering this area as a separate floristic province. Based on the evaluation of published data from 682 known alpine species ca. 160 species have been known only by one record, 110 species by 2-3 records and 87 endemic species have been known only based on the type location. These plants need a strong conservation and protection management since the fragile ecosystems are often very restricted, small and very isolated, nonetheless grazing and overgrazing are still common threats.

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