Study on the Environmental Factors Contributing to Distribution of Thymus kotschyanus in Taleghan Basin, Iran
الموضوعات :
Leila Darvishi
1
(Department of Rangeland Management, University of Tehran)
Mohammad Ali Zare Chahouki
2
(Department of Rehabilitation of Arid and Mountainous Regions, Faculty of Natural Resources, University
of Tehran)
Mohammad Jafari
3
(Department of Rehabilitation of Arid and Mountainous Regions, Faculty of Natural Resources, University
of Tehran)
Hussein Azarnivand
4
(Department of Rehabilitation of Arid and Mountainous Regions, Faculty of Natural Resources, University
of Tehran)
Majid Yousefi Valikchali
5
(Faculty of Forest Science, Gorgan University of Agricultural Sciences & Natural Resources)
الکلمات المفتاحية: PCA, Taleghan rangelands, Thymus kotschyanus, TWINSPAN,
ملخص المقالة :
Growth and productivity of plants are mainly affected by various environmentalfactors in different ecosystems and natural habitat in the world. This research aims to studythe existing relationships between the phytosociology characteristics of Thymuskotschyanus and environmental factors in order to find the most important factorsgoverning development of the species in middle Taleghan rangelands, Iran. Subsequent toindicating the study region, the required flora and environmental data were collected byfield survey. Plot size and sample size were determined by minimum area and vegetationprocedure methods, using 40 plots along four 100 m transects. The characteristicsincluding floristic list, percentage of canopy cover, number of plants as well as height, thelargest and smallest diameter, and freshness of T. kotschyanus were recorded. Likewise,bare soil percentage, litter percentage, and stone and gravel percentage of topsoil wererecorded in each plot. Moreover, in order to study the soil features, eight soil profiles weretaken in each site up to 30 cm depth at the beginning and end of each transect.Classification of vegetation cover was performed by TWINSPAN analysis while factorsinfluencing the change in vegetation characteristics of T. kotschyanus were determined byPCA analysis. Results demonstrated that factors involving slope, altitude, organic matter,lime content, nitrogen content and soil texture show the highest impact on vegetationcharacteristics. Overall, variables including elevation ranging between 2300-2500 m, slopein the range of 20% - 40%, and fertile sandy loam textured soils in presence of nitrogenand high organic matter content as well as low lime content provide the most suitablecondition to develop a high production T. kotschyanus.
Akbarzadeh, M., 2003. Medicinal plants of the
family Labiatae in the Vaz Mazandaran region.
Iranian Jour. Medicinal and Aromatic Plants.,
19(1): 37-45. (In Persian).
Boira, H. and Blanquer, A., 1998. Environmentalfactors affecting chemical variability of
essential oils in Thymus piperella L.
Biochemical Systematics and Ecology., 26(8):
811-822.
Corticchiato, M., Tomi, F., Bernardini, A. F.,
Casanova, J., 1998. Composition attnd
infraspecific variability of essential oil from
Thymus herba barona Lois Biochem. Syst.
Ecol., 26: 915-932.
Davies, K. W., 2007. Environmental and
vegetation relationships of the Artemisia
tridentata spp. wyomingensis alliance. Jour.
Arid Environments., 70: 478-494.
Escudero, A., Iriondo, J. M., Olano, J. M., Rubio
A., Somolinos, R. C., 2000. Factor affecting
establishment of a Gypsophyte, the case of
Lepidium subulatum (Brassicaceae). Am. Jour.
Bot., 87: 861-871.
Habibi, H., Mazaheri, D., Majnon Hossini, N.,
Chaiechi, M., Fakhretabatabaie, M., 2006. The
height of the essential oils and medicinal
compounds Thymus kotschyanus Boiss. (Case
Study: Taleghan rangelands). Jour. Research
and Development, 19(8): 2-10. (In Persian).
Hasani, J., 2004. Identification and ecology of
two species of aromatic plants Ziziphora sp. and
Thymus sp. in Kurdistan. Iranian Jour.
Medicinal and Aromatic Plants, 20(1): 1-17. (In
Persian).
Hill, M. and Hill, O., 1979. TWINSPAN - A
FORTRAN program for arranging multivariate
data in an ordered two-way table by
classification of the individuals and attributes.
Cornell University, Ithaca, New York.
Jamshidi, A., Aminzadeh, M., Azarnivand, H.,
Abedi, M., 2006. High impact on the quantity
and quality of plant oils T. kotschyanus (Case
Study: Tar Lake). Iranian Jour. Medicinal and
Aromatic Plants, 18(5): 17-22. (In Persian).
Kent, M. and Coker, P., 1992. Vegetation
description and analysis: a practical approach.
John Wiley and Sons.
Larti, M. and Ghasempour, S., 2009. Identifying
and assessing ecological Thymus species to
domestication and cultivation in West
Azerbaijan. Booklet published by Agriculture
and Natural Resources Research Center of West
Azerbaijan, Iran. 6 pp. (In Persian).
Mirdavoodi, H. and Babakhanloo, P., 2007.
Identification of medicinal plants of Markazi
province. Iranian Jour. Medicinal and Aromatic
Plants, 23(4): 544-559. (In Persian).
Mohtashamnia, S., Zahedi Amiri, Gh., Arzani, H.
2007. Vegatation ordination of steppie
Rangelands in relation to the edaphical and
physiographical factors. Agricultural Sciences
and Natural Resources Jour., 14(6): 111-123.
(In Persian).
Stahl-biskup, E., 1991. The chemical composition
of Thymus sp. oil. J. Essent. Oil. Res., 3: 61-82.
Zare Chahouki, M. A., 2006. Modelling the
spatial distribution of plant species in arid and
semi-arid rangelands. Ph.D. Thesis in Range
Management, Faculty of Natural Resources,
University of Tehran, Iran.180 pp. (In Persian).
Zargari, A., 1990. Medicinal Plants (Volume IV).
Printing and Publishing Institute of University
of Tehran., 923 pp. Tehran, Iran. (In Persian).
