Strategic Research Journal of Agricultural Sciences and Natural Resources

Strategic Research Journal of Agricultural Sciences and Natural Resources

Decline of Zagros Forest Ecosystem: Status of Dieback in Various Tree Species

Document Type : Original Article

Authors
Jabar Valipour 1
Mohsen Javanmiri pour 2
Abbasali Zamani 3
1 Natural Resource Organization
2 Natural resource organization
3 Member of the academic staff of the Faculty of Agriculture, Razi University of Kermanshah.
10.22047/srjasnr.2023.181002
Abstract
The mortality of forest species, especially in arid and semi-arid regions, has been considered the main challenge of diverse ecosystems. The aim of this study was to compare the mortality status of Iranian oak and Mt. Atlas mastic tree in the Zagros forests in western Iran. To carry out this study, whole forests in the Gilan-e Gharb were considered. For this purpose, the entire surface was divided into equal parts with a sampling grid of 3000 x 3000 m2. Ninety two sample plots with an area of 0.25 ha considered for sampling at the intersection of the lines in the forests. Sampling of all the were trees in the plots was done 100%. Based on objective observations, the ratio of dried branches to the whole tree branches was used to determine the dryness ratio of the studied trees. The results showed that the frequency of 1st mortality in different species shows that its highest frequency is 83.4% in Iranian oak (Quercus brantii Lindl.). Other species in the region, such as Prunus lycioides C.K.Schneid., Pistacia atlantica mutica Desf., Acer monspessulanum L., and Crataegus sp. L., had 5.1%, 4.4%, 3.2%, and 2% of 1st mortality, respectively. The frequency of 2nd mortality in Persian oak was 84.4% and in other species in the region, such as P.atlantica, Crataegus sp, and P.lycioides C.K.Schneid., it was 9.8%, 2.25%, and 2%, respectively. Similarly, the highest frequency of trees with mortality grade 5 included Iranian oak,  P. atlantica mutica Desf., and P. lycioides C.K.Schneid. species with 94.2%, 2.8%, and 2.6%, respectively. From the total population of Persian oaks, 28% of them were healthy and 72% of them were dying in various degrees. In the wild plum species, 83% of the trees were healthy and 17% were dying. Furthermore, in the wild pistachio species, 23% of the trees were alive and healthy and 77% of them were dead. Based on the results, supporting measures will include monitoring the structure of stands for better protection of forests, maintaining the mix of stands and stimulating structural complexity and heterogeneity, that are valuable tools to reduce the risks associated with increasing tree dieback, and other new disturbance regimes in line with the resilience strategy.
Keywords
decline
Persian oak
Mt. Atlas mastic tree
Pronus
Zagros
Subjects
Arend, M., T. Kuster, M.S., Günthardt-Goerg., & Dobbertin, M. (2011). Provenance-specific growth responses to drought and air warming in three European oak species (Quercus robur, Q. petraea and Q. pubescens), Tree Physiology 31(3), 287-297.
Bédard, S., DeBlois, J., Guillemette, F., Larouche, C., Raymond, P., & Tremblay, S. (2014). Rehabilitation of Northern stands using multicohort silvicultural scenarios in Québec. Journal of forestry 112, 276-286.
Batos, B., Z. Miletic, S. Orlovic & D. Miljkovic. (2010). Variability of nutritive macroelements in peduncalate oak  (Quercus robur L.) leaves in Serbia. Genetika 42(3), 435-453.
Clatterbuck, W.K., & Kauffman, B. (2006). Managing oak decline. A Regional Peer-Reviewed Technology Extension Publication University of Kentucky’s. Cooperative Extension Publication, 6 p.
Curtis, P. G., Slay, C. M., Harris, N. L., Tyukavina, A., & Hansen, M. C. (2018). Classifying drivers of global forest loss. Science 361(6407), 1108-1111.
Dendixsen, D.P. (2012). Causes and effects of Oak decline in an upland Oak-hickory forest of eastern Oklahoma. M.Sc. thesis, Oklahoma State University, 118 pp.
Elliott, K.j., & Swank, W.T. (1994). Impacts of drought on tree mortality and growth in a mixed hardwood forest. Journal of vegetation science 5 (2), 229-236.
Ellis, E. C., Beusen, A. H., & Goldewijk, K. K. (2020). Anthropogenic Biomes: 10,000 BCE to 2015 CE. Land 9(5), 129.
Encina-Domínguez, J.A., Estrada-Castillón, E., Mellado, M., González-Montelongo, C., & Arévalo, J.R. (2022). Livestock Grazing Impact on Species Composition and Richness Understory of the Pinus cembroides Zucc. Forest in Northeastern Mexico. Forests 13, 1113.
Fettig, CJ., Mortenson, LA., Bulaon, BM., & Foulk, PB. (2019). Tree mortality following drought in the central and southern Sierra Nevada, California. US. Forest Ecology and Management 432, 164–178.
Fukuda, H. (2000). Programmed cell death of tracheary elements in plants. Plant Mol Biol 44(3), 245-53.
Galiano, L., Martnez-Vilalta, J., Sabaté, S., & Lloret. F. (2012). Determinants of drought effects on crown condition and their relationship with depletion of carbon reserves in a Mediterranean holm oak forest. Tree Physiology 32(4), 478-489.
Guarin, A., & Taylor, A.H. (2005). Drought triggered tree mortality in mixed conifer forests inYosemite National Park, California, USA. Forest Ecology and Management 218(1), 229- 244.
Kukk, M., &  Sõber, A. (2015). Bud development and shoot morphology in relation to crown location. AoB Plants. Jul 17;7:plv082. doi: 10.1093/aobpla/plv082. PMID: 26187607; PMCID: PMC4565424.
Kabrick, J M., Dey, D C., Jensen, R G., & Wallendorf, M. (2008). The role of environmental factors in oak decline and mortality in the Ozark Highlands. Forest Ecology and Management 255, 1409–1417.
Martínez-Sancho, E., Gutiérrez, E., Valeriano, C., Ribas, M., Popkova, M.I., Shishov, V.V., & Dorado-Liñán, I. 2021. Intra- and Inter-Annual Growth Patterns of a Mixed Pine-Oak Forest under Mediterranean Climate. Forests 12, 1746.
Maxwell, S. L., Fuller, R. A., Brooks, T. M. & Watson, J. E. (2016). Biodiversity: The ravages of guns, nets and bulldozers. Nature 536(7615), 143.
Najib, R., Houri, T., Khairallah, Y., & Khalil, M. (2022). Effect of dust accumulation on Quercus cerris L. leaves in the Ezer forest, Lebanon. iForest 15, 322-330.
 Ritchie, H., & Roser, M. (2021). "Forests and Deforestation". Published online at OurWorldInData.org. Retrieved from: 'https://ourworldindata.org/forests-and-deforestation' [Online Resource]
Palik, B., D'Amato, A., Franklin, J., & Norman.  K. (2021).  Ecological Silviculture: Foundations and Applications. Waveland Press, 343.
Pendrill, F., Persson, U. M., Godar, J., & Kastner, T. (2019). Deforestation displaced: trade in forest-risk commodities and the prospects for a global forest transition. Environmental Research Letters 14(5), 055003.
Poulos, HM. (2014). Tree mortality from a short-duration freezing event and global-change-type drought in a Southwestern piñon-juniper woodland, USA. PeerJ. 10;2:e404. doi: 10.7717/peerj.404. PMID: 24949231; PMCID: PMC4060029.
 Sagheb Talebi, Kh.,  Sajedi, T.,  & Pourhashemi, M. (2014). Forests of Iran, A Treasure from the Past, a Hope for the Future. Springer, 172 p.
Williams, M. (2003). Deforesting the earth: from prehistory to global crisis. University of Chicago Press.
Wright, H. E., McAndrews, J. H., & Zeist, W. V. (1967). Modern pollen rain in western Iran, and its relation to plant geography and quaternary vegetational history. Journal of Ecology 55, 415–443.
Zhu, J.J., & Li, F. Q. (2007). Forest degradation/decline: research and practice. Ying Yong Sheng Tai Xue Bao. 2007 Jul;18(7):1601-9. Chinese. PMID: 17886658.
Strategic Research Journal of Agricultural Sciences and Natural Resources
Volume 8, Issue 2
October 2023
Pages 171-186