Astragalus ovinus Boiss. Responses Along the Gradient of Environmental Factors in Oak Forests of Yasouj, Iran

نوع مقاله : مقاله پژوهشی

نویسندگان

1 Assistant Prof., Research Division of Forest, Rangeland and Watershed, Kohgiluyeh and Boyerahmad Agriculture and Natural Resources Research and Education Center, AREEO, Yasouj, I. R. Iran

2 Associate prof., Research Division of Forest and rangeland, Markazi Agriculture and Natural Resources Resear ch and Education Center, AREEO, Arak, I. R. Iran

چکیده

 

Environmental factors have a major impact on the distribution and yield of plant species. For this purpose, considering the importance of Astragalus ovinus (L.) Boiss. in forage production and the possibility of using it in improvement and reclamation of forest ecosystem. In the present study, the responses of A. ovinus were evaluated to some environmental factors in one of its habitats of southwest of IRAN (Kohgiluyeh and Boyer-Ahmad province) in 2018- 2020. Redundancy Analysis (RDA) and Generalized Additive Models (GAM) were used to determine the ecological factors affecting vegetation changes and to evaluate the response of A. ovinus along the gradients of  ecological factors, respectively. Data analysis was performed using SPSS17 and CANOC4.5 software. According to the results, the response pattern of A. ovinus along the gradient of soil surface litter, percentage of bare soil, percentage of land slope, and altitude, followed the unimodal model and the optimum growth levels for these factors were 20%, 20%, 30%, and 2220 m, respectively. Also, the response of this species to aspects has followed the unimodal model, so that in the eastern and western slopes, the presence of the species increased and the northern, southern slopes of the species decreased. The reaction of this species to changes in soil sand content followed the bimodal model indicatinga competitive constraint along the environmental gradient. The results of the A. ovinus phenology study showed that the best time for livestock to use of this species is mid-May and the best time to collect seeds of this species is late June to the first half of July. Percentage of canopy cover in forest it has not affected the performance and frequency of this species. Regarding the response of this plant to the gradient of studied environmental factors, it is recommended to pay attention to its habitat characteristics and ecological requirements in improvement programs on oak forests understorey vegetation.

کلیدواژه‌ها

عنوان مقاله [English]

Astragalus ovinus Boiss. Responses Along the Gradient of Environmental Factors in Oak Forests of Yasouj, Iran

نویسندگان [English]

  • Yousef Askari 1
  • Hamidreza Mirdavoudi 2
1 Assistant Prof., Research Division of Forest, Rangeland and Watershed, Kohgiluyeh and Boyerahmad Agriculture and Natural Resources Research and Education Center, AREEO, Yasouj, I. R. Iran
2 Associate prof., Research Division of Forest and rangeland, Markazi Agriculture and Natural Resources Resear ch and Education Center, AREEO, Arak, I. R. Iran
چکیده [English]

 

Environmental factors have a major impact on the distribution and yield of plant species. For this purpose, considering the importance of Astragalus ovinus (L.) Boiss. in forage production and the possibility of using it in improvement and reclamation of forest ecosystem. In the present study, the responses of A. ovinus were evaluated to some environmental factors in one of its habitats of southwest of IRAN (Kohgiluyeh and Boyer-Ahmad province) in 2018- 2020. Redundancy Analysis (RDA) and Generalized Additive Models (GAM) were used to determine the ecological factors affecting vegetation changes and to evaluate the response of A. ovinus along the gradients of  ecological factors, respectively. Data analysis was performed using SPSS17 and CANOC4.5 software. According to the results, the response pattern of A. ovinus along the gradient of soil surface litter, percentage of bare soil, percentage of land slope, and altitude, followed the unimodal model and the optimum growth levels for these factors were 20%, 20%, 30%, and 2220 m, respectively. Also, the response of this species to aspects has followed the unimodal model, so that in the eastern and western slopes, the presence of the species increased and the northern, southern slopes of the species decreased. The reaction of this species to changes in soil sand content followed the bimodal model indicatinga competitive constraint along the environmental gradient. The results of the A. ovinus phenology study showed that the best time for livestock to use of this species is mid-May and the best time to collect seeds of this species is late June to the first half of July. Percentage of canopy cover in forest it has not affected the performance and frequency of this species. Regarding the response of this plant to the gradient of studied environmental factors, it is recommended to pay attention to its habitat characteristics and ecological requirements in improvement programs on oak forests understorey vegetation.

کلیدواژه‌ها [English]

  • Ecological factors
  • Generalized Additive Model
  • Ordination
  • Species response curve

مراجع

 
Akaike, H. (1974). A new look at the statistical model identification, IEEE Transactions on Automatic Contorol, 19(6), 716-723. https://doi.org/10.1109/TAC.1974.1100705
Alavi, S.J., Zahedi Amiri, G., Rahmani, R., Marvi Mohajer, M.R., Muys, B., & Nouri, Z. (2013). Investigation on the response of Fagus orientalis Lipsky to some environmental variables using beta function and its comparison with Gaussian function (Case study: Kheyrud forest research station). Iranian Journal of Forest, 5(2), 161-171. (In persian)
Ardekani, M.R. (2009). Ecology, Tehran University Publication, 340p. (In persian)
Arzani, H., Sadeghi manesh, M., Azarnivand, H., Asadian, Q., & Shahriari, E. (2009). Effect of phenological stage on forage quality of twelve rangeland species in Hamedan province. Journal of Rangeland and Desert Research of Iran, 15(1), 42 -50. (In persian)
Arzani, H., & Abedi, M. (2015). Rangeland Assessment: The Vegetation Measurement. Tehran University Publication, pp 295. (In persian)
Askari, Y., & Mirdavodi, H. (2020). Floristic study and chorology of plants species in Kohgiluyeh and boyerahmad province (Case study: Vezg Pass), 6th International Conference on Agriculture Sciences, Environment, Urban and Rural Development, 12 pp. (In persian)
Asri, Y. (2005). Vegetation Ecology, Payam Nour University Press, pp 214. (In persian)
Austin, M.P., & Smith, T.M. (1989). A new model for the continuum concept. Vegetatio, 83, 35–47. https://doi.org/10.1007/BF00031679
Bakkenes, M., Alkemade, J.R.M., Ihle, F., Leemans, R., & Latour, B. (2002). Assessing the effects of forecasted climate change on the diversity and distribution of European higher plants for 2050. Global Change Biology, 8, 390–407. https://doi.org/10.1046/j.1354-1013.2001.00467.x
Balent, G., & Stafford Smith, D.M. (1991). Conceptual model for evaluating the consequences of management practices on the use of pastoral resources. In: Proceedings of the fourth International Rangeland Congress. Montpellier, France, 1158–1164.
Beers, T.W., Dress, P.E., & Wensel, L.C. (1966). Aspect trans-formation in site productivity research. Journal of Forestry, 64(10), 691–692.
Borcard, D., Legendre, P., & Drapeau, P. (1992). Partialling out the spatial component of ecological variation. Ecology, 73, 1045-1055. https://doi.org/10.2307/1940179
Carcey Hincz, P.A., & Aguilar, I.D. (2011). Impact of grazing on soil mesofauna diversity and community composition in deciduous forested rangelands of northwest Alberta. 23 pp.
Cimalova, S., & Lososova, Z. (2009). Arable weed vegetation of the northeastern part of the Czech Republic: effects of environmental factors on species composition. Plant Ecology, 203, 45–57. . https://doi.org/10.1007/s11258-008-9503-1
Dawson, CW., Abrahart, R.J., & See, L.M. (2007). HydroTest: a web-based toolbox of evaluation metrics for the standardized assessment of hydrological forecasts, Environmental Modelling and Software, 22(7), 1034-1052. https://doi.org/10.1016/j.envsoft.2006.06.008
Fahimipour, E., Chahuki, M.A.Z., & Tavili,  A. (2010). Investigation on some environmental factors influencing distribution of plant species (Case study: Taleghan rangeland). Iranian Journal of Rangeland, 13(1), 23-32. (In persian)
Feizi, M.T., Khodagholi, M., Saeedfar, M., & Shahmoradi, A. (2003). Autecology of Eurotia ceratoides L. in Esfahan province, Iranian journal of Range and Desert Research, 10(4), 387-408. (In persian) https://doi.org/10.22092/ijrdr.2019.119686
Gavili Kilaneh, E., & Vahabi, M.R. (2012). The effect of some soil characteristics on range vegetation distribution in central Zagros. Iranian Journal of Science and Technology, 16(59), 245- 258. (In persian)
Ghorbani, A., Abbasi Khalaki, M., Asghari, A., Omidi, A., & Zare Hesari, B. (2015). Comparison of some effective environmental factors on the distribution of Artemisia fragrans willd. and Artemisia austriaca Jacq. in southeast faced slopes of Sabalan. Iranian Journal of Rangeland, 9(2), 129-141. (In persian)
Godefroid, S., & Koedam, N. (2004). Interspecific variation in Soil compaction sensitivity among forest floor species. Biological Conservation, 119, 207- 217. https://doi.org/10.1016/j.biocon.2003.11.009
Gogina, M. (2010). Investigation of interrelations between sediment and near-bottom environmental parameters and macrozoobenthic distribution patterns for the Baltic S

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  • تاریخ دریافت: 25 خرداد 1402
  • تاریخ پذیرش: 25 خرداد 1402

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