Spatial Analysis of Environmental Hazards

Spatial Analysis of Environmental Hazards

Investigation and Determine of Ecological Characteristics of Sites of some old Broad-leaf and needle-leaf Trees in Zagros forests (Case study: Forests of Ilam Province)

Authors
ahmad hosseini
mostafa khoshnevis
shamsollah asgari
Agricultural Research, Education and Extension Organization (AREEO
10.52547/jsaeh.8.4.179
Abstract
.

Introduction

Old trees are important and key elements of forest sites and are of great value in terms of forest management, reforestation, silviculture and ecology. Although old trees constitute a small percentage of forest trees, they account for a large share of forest carbon reserve and play a vital role in carbon storage. Understanding the how geographical and site distribution of these trees across the forest is essential to obtain information for forest restoration management. Therefore, this study was carried out to investigate the geographical and site characteristics of old trees of Wing nut, Ash, Hackberry, Sycamore, Elm, Olive, Cypress and Fig in Ilam province.



Materials and methods

After querying the villagers and local people and conducting numerous forest surveys, the old trees were identified and selected on the basis of the diameter of the breast. Then their geographical characteristics including city, district, village, geographical coordinates and site conditions including slope, aspect, altitude, soil depth, climate and proximity to water source were measured or recorded.



Results and discussion

The results showed that in terms of geographically distribution, the identified old trees have located in Ilam, Mehran, Malekshahi, Badreh and Dehloran cities. Topographically, the old trees of Wing nut, Elm, Ash and Fig were located in the 0-10% slope class, Hackberry and sycamore in the 0-10% and 10-30% slope classes, olive in the 10-30% slope class and Cypress in the 40-70% slope class. The old trees of Wing nut, elm, Ash and Hackberry were located in the north aspect, fig, sycamore and Cypress in the south aspect and olive in the west and south aspects. The old trees of Wing nut, elm, Ash, Hackberry, Sycamore and Cypress were dispersed at altitude class of 1100–1250 m and olive and fig old trees were at altitude class of 1250–1400 m above sea level. Climatically, the old trees of Wing nut, elm, Ash and Hackberry were located in the very cold Mediterranean climate, Cypress trees and some sycamore trees in the cold Mediterranean climate, and fig, olive and some plantain trees were in the semiarid cold climate. In terms of access to water resources, old trees of Wing nut, elm, Ash, Sycamore, Hackberry and Fig were located on the bed or margin of river, old Cypress trees had no access to water resources and some olive trees were close to water resources. In terms of soil subsidence, old trees of Wing nut, elm, Hackberry, olive, and fig were mostly in soils with medium depths. Old ash and sycamore trees were present in shallow to medium depths and old cypress trees were present in shallower soils. Although the identified old trees were present in limited sites, their long-term and sustained presence in these sites indicates that sites conditions are favorable for their survival.



Conclusion

Therefore, it can be concluded that the presence of low slopes, suitable soil bed and access to water resources were desirable characteristics for stability and survival of the studied old trees in these sites. Due to the above-mentioned characteristics, ecologically similar sites can be found in the forests of the province and can be restored by seed of old and resistant trees.

Keywords: Site, Topography, Climate, Geography, Old trees, Ilam


Keywords
Site
Topography
climate
Geography
Old trees
Ilam
Azaryan, M., Marvie Mohadjer, M.R. Etemaad, V., Shirvany, A. and Sadeghi, S.M.M., 2013. Morphological characteristics of long-lived trees in Hyrcanian Forests. Journal of forest and wood products. 68(1), 47 – 59.
Browicz, K., I982. Chorology of trees and shrubs in South-west Asia and adjacent regions. Polish Academy of Science. Institute of Dendrology, Warszawa, vol. one. 59 P.
Djazirehe, M.H., 2001. To afforest in arid envirionment, Tehran university press, 451pp.
Ebrahimi Gadjouti, T., 2015. Evaluation of habitat requirements of ash (Fraxinus excelsior L.) forest species in Arasbaran, East Azerbaijan. At the First National Conference on New Findings in Agricultural and Natural Resources Research.
Haji Mirsadeghi, M.M.A., Asadollahi, F., Djazirehe, M.H. and Tabari Kochkraei, M., 2002. Investigation of Forest Communities and Environmental Needs of Fraxinus excelsior L. in Forests of Northern Iran. Pajoohesh and sazandegi. 2 (15), 94-101.
Ikin, K., Mortelliti, A., Stein, J. R., Michael, D., Crane, M., Okada, S., Wood, J. and Lindenmayer, D.B., 2015. Woodland habitat structures are affected by both agricultural land management and abiotic conditions. Landscape Ecology. 30, 1387–1403.
Jahanbazi Gojani, H., Heidari, H., Saqeb Talebi K. and Khatamaz, M., 2002. Evaluation of site requirement of elm (Ulmus boissieri Grudz) in Tang Honey Bazoft, Chaharmahal va Bakhtiari province. Iranian journal of forest and poplar research. 8, 1-57.
Karimi, Z., Iraninejad, M. H., Mosleh, A., Kiani, B., 2011. Evaluation of site conditions and causes of establishment of wild fig groves in mountain of Shirkooh Yazd. M.Sc. Thesis. Yazd University.
Lindenmayer, D.B., Mackey, B.G., Mullen, I.C., McCarthy, M.A., Gill, A.M., Cunningham, R.B. and Donnelly, C.F., 1999. Factors affecting stand structure in forests – are there climatic and topographic determinants?. Forest Ecology and Management. 123, 55-63.
Lindenmayer, D.B., Laurance, W.F. and Franklin, J.F., 2012. Global decline in large old trees. Science. 338, 1305-1306.
Maroufi, H., 2000. Site demands of Lebanon oak (Quercus libani Oliv.) in Kurdistan province. M.Sc. thesis. Imam Khomeini Higher Education Center, Karaj.
Mossadegh, A. 1998. World forest geography, Tehran University Press, Tehran.
Najafi, T., Nasr, M. H. and Bardbar, M. K., 2008. Investigation of the site requirement of Cupressus sempervirens L. in Fars province. M.Sc. Thesis. Mazandaran University.
Netsvetov, M., Prokopuk, Y., Puchałka, R., Koprowski, M., Klisz, M. and Romenskyy, M., 2019. River Regulation Causes Rapid Changes in Relationships Between Floodplain Oak Growth and Environmental Variables. Frontiers in Plant Science, Published online. doi: 10.3389/fpls.2019.00096.
Pederson, N., 2010. External Characteristics of Old Trees in the Eastern Deciduous Forest. Natural areas journal. 30(4), 396-407.
Polunin, O., 1997. Tree and bushes of Britain and Europea. Palandin. London.
Pourbabaei, H., Kuhestani, J. S. and Adel, M. N., 2014. Study on Ecology of Hackberry Trees (Celtis australis) in the West Forests of Guilan (Case Study: Rezvanshahr and Taniyan). Ecology of Iranian Forest. 2 (4), 1-11.
Sagheb Talebi, Kh., Sohrabi, S. R. and Khademi, K., 2001. Study of site and silviculture characteristics of Pterocarya fraxinifolia Spach stand in Lorestan province.
Sohrabi, S., 2002. Evaluation of site and silviculture characteristics of Pterocarya fraxinifolia Spach stand in Lorestan province. M.Sc. Thesis. Science and Research Branch, Islamic Azad University.
Sohrabi, S. R. and Mehdifar, d., 1997. Quantitative and Anatomical Study of Pterocarya fraxinifolia Spach stand in Shol Abad area of Lorestan province. Forest and Rangeland. 35, 8-15.
Talebi, M., Sagheb-Talebi, Kh. and Jahanbazi, H., 2006. Site demands and some quantitative and qualitative characteristics of Persian Oak (Quercus brantii Lindl.) in Chaharmahal & Bakhtiari Province (western Iran). Iranian Journal of Forest and Poplar Research. 14(1), 67-79.
Thomas, R. Q., Kellner, J. R., Clark, D. B. and Peart, D. R., 2013. Low mortality in tall tropical trees. Ecology. 94, 920–929.
Vanak, A. T., Shannon, G., Thaker, M., Page, B., Grant, R. and Slotow, R., 2011. Biocomplexity in large tree mortality: interactions between elephant, fire and landscape in an African savanna. Ecography. 35, 315–321.
Van Pelt, R., 2007. Identifying Mature and Old Forests in Western Washington. Department of Natural Resources, Olympia, W.A., Washington.
Zobel, B. J. and van Buijtnen, J. P., 1989. Wood variation its causes and control. Springer-Verlag, Nature. 363 pp.
Spatial Analysis of Environmental Hazards
Volume 8, Issue 4
Winter 2021
Pages 179-192