The Effect of Understory Shrub Species on the Natural Regeneration of Hyrcanian Mixed Broad-Leaved Forests (Kheyrud, Iran)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 M.Sc. in Forestry, Dept. of Arid Land Forestry, Faculty of Desert Studies, Semnan University, Semnan, Iran

2 Assistant Prof., Research institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran.

3 Associate Prof., Dept. of Forestry, Faculty of Natural Resources, University of Tehran, Tehran, Iran.

4 Assistant Prof., Dept. of Arid Land Forestry, Faculty of Desert Studies, Semnan University, Semnan, Iran.

چکیده

 

Iran’s Hyrcanian forests are part of the temperate forests and have survived since Tertiary. These forests have experienced severe damages in recent decades because of socio-economic issues such as overgrazing. This study aimed at investigating the Nurse-protégé interaction and the impact of understory shrub species on the regeneration of the Hyrcanian main tree species in Kheyrud Forests. Filed sampling was carried out using the random-systematic method. Regeneration and their features under and outside of the canopy of shrub species, as well as some environmental variables were recorded in strip plots. According to the results, the canopy cover percentage of 25-50% provides the best regeneration protection efficiency for the six nurse shrub species. Overall, regeneration density was found to be higher outside the canopy area of the shrub species than beneath their canopy area; however, regeneration under the shrub species caused higher mean height and age. Moreover, the mean cover and the depth of the litter under the shrub canopy were significantly higher than that of outside the canopy area. Although the shrub species allow more durable and complete development of seedlings by providing protection against grazing, suitable conditions for seed germination and seedling growth may not be provided because of high litter depth and insufficient sunlight due to the massive canopy of trees as well as nurse shrubs’ dense foliage (especially, evergreen understory species).

کلیدواژه‌ها

عنوان مقاله [English]

The Effect of Understory Shrub Species on the Natural Regeneration of Hyrcanian Mixed Broad-Leaved Forests (Kheyrud, Iran)

نویسندگان [English]

  • Saman Eghrari 1
  • Hooman Ravanbakhsh 2
  • Anoushiravan Shirvany 3
  • Davoud Kartoolinejad 4
1 M.Sc. in Forestry, Dept. of Arid Land Forestry, Faculty of Desert Studies, Semnan University, Semnan, Iran
2 Assistant Prof., Research institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran.
3 Associate Prof., Dept. of Forestry, Faculty of Natural Resources, University of Tehran, Tehran, Iran.
4 Assistant Prof., Dept. of Arid Land Forestry, Faculty of Desert Studies, Semnan University, Semnan, Iran.
چکیده [English]


Iran’s Hyrcanian forests are part of the temperate forests and have survived since Tertiary. These forests have experienced severe damages in recent decades because of socio-economic issues such as overgrazing. This study aimed at investigating the Nurse-protégé interaction and the impact of understory shrub species on the regeneration of the Hyrcanian main tree species in Kheyrud Forests. Filed sampling was carried out using the random-systematic method. Regeneration and their features under and outside of the canopy of shrub species, as well as some environmental variables were recorded in strip plots. According to the results, the canopy cover percentage of 25-50% provides the best regeneration protection efficiency for the six nurse shrub species. Overall, regeneration density was found to be higher outside the canopy area of the shrub species than beneath their canopy area; however, regeneration under the shrub species caused higher mean height and age. Moreover, the mean cover and the depth of the litter under the shrub canopy were significantly higher than that of outside the canopy area. Although the shrub species allow more durable and complete development of seedlings by providing protection against grazing, suitable conditions for seed germination and seedling growth may not be provided because of high litter depth and insufficient sunlight due to the massive canopy of trees as well as nurse shrubs’ dense foliage (especially, evergreen understory species).

کلیدواژه‌ها [English]

  • Nurse shrubs
  • Natural regeneration
  • Seedling
  • Temprate forests

مراجع

 
Anthelme, F., Gómez‐Aparicio, L., & Montúfar, R. (2014). Nurse‐based restoration of degraded tropical forests with tussock grasses: experimental support from the Andean cloud forest. Journal of Applied Ecology, 51(6), 1534–1543. doi: 10.1111/1365-2664.12311
Caldeira, M.C., Ibáñez, I., Nogueira, C., Bugalho, M.N., Lecomte, X., Moreira, A., & Pereira, J.S. (2014). Direct and indirect effects of tree canopy facilitation in the recruitment of Mediterranean oaks. Journal of Applied Ecology, 51(2), 349–358. doi: 10.1111/1365-2664.12189
da Silva Junior, J.C.C., Rovedder, A.P.M., Capitani, L.C., Schenato, R.B., Neuenschwander, F., Peccatti, A., & da Silva, R.P.  (2021). Does the high density of Psychotria shrubs in the understory influence the natural regeneration of trees?.  Ecological Engineering, 172, 106401. doi : 10.1016/j.ecoleng.2021.106401
Filazzola, A., & Lortie, C.J. (2014). A systematic review and conceptual framework for the mechanistic pathways of nurse plants. Global Ecology and Biogeography, 23(12), 1335–1345. doi: 10.1111/geb.12202
Flores, J., & Jurado, E. (2003). Are nurse‐protégé interactions more common among plants from arid environments?. Journal of Vegetation Science, 14(6), 911–916. doi: 10.1658/1100-9233(2003)014[0911:ANIMCA]2.0.CO;2
Gómez‐Aparicio, L. (2009). The role of plant interactions in the restoration of degraded ecosystems: a meta‐analysis across life‐forms and ecosystems. Journal of Ecology, 97(6), 1202–1214. doi: 10.1111/j.1365-2745.2009.01573.x
Jafarzade, M., Ravanbakhsh, H., Moshki, A., & Mollashahi, M. (2022). Recolonization by Indigenous broadleaved species of a conifer plantation (Cupressus spp.) in Northern Iran after 25 years. Annals of Forest Science, 79(1), 1-13. doi: 10.1186/s13595-022-01131-1
Javanmiri Pour, M., Marvi Mohdjer, M., Etenad, V., & Zobeiri, M. (2014). The Effects of Grazing on Change and Diversity of Natural Regeneration (A Case Study: Patom District, Kheyroud Forest). Journal of Forest and Wood Product (Iranian Journal of Natural resources), 66(4), 401–426. (In Persian with English abstract). (In persian)
Joel, F., & Enrique, J. (2003). Are nurse-protégé interactions more common among plants from arid environments?. Journal of Vegetation Science, 14, 911–916. doi: 10.1658/1100-9233(2003)014[0911:ANIMCA]2.0.CO;2
Heinrichs, S., Öder, V., Indreica, A., Bergmeier, E., Leuschner, C., & Walentowski, H. (2021). The Influence of Tilia tomentosa Moench on Plant Species Diversity and Composition in Mesophilic Forests of Western Romania–A Potential Tree Species for Warming Forests in Central Europe?. Sustainability, 13(14), 7996. doi: 10.3390/su13147996
Kimmins, J.P. (1987). Forest ecology. Macmillan Publishing Company, New York, NY, United States.
Kuiters, A.T. (1990). Role of phenolic substances from decomposing forest litter in plant–soil interactions. Acta botanica neerlandica, 39(4), 329–348.
Leps, J., & Smilauer P. (1999). Multivariate analysis of ecological data, Faculty of Biological Sciences, University of South Bohemia, Ceské Budejovice.
Loydi, A., Eckstein, R.L., Otte, A., & Donath, T.W. (2013). Effects of litter on seedling establishment in natural and semi‐natural grasslands: a meta‐analysis. Journal of Ecology, 101(2), 454–464. doi: 10.1111/1365-2745.12033
O’Brien, M.J., O’Hara, K.L., Erbilgin, N., & Wood, D.L. (2007). Overstory and shrub effects on natural regeneration processes in native Pinus radiata stands. Forest Ecology and Management, 240(1-3), 178-185. doi:10.1016/j.foreco.2006.12.025
Ravanbakhsh, H., Marvi Mohajer, M.R., & Etemad, V. (2010). Natural Regeneration of Woody Species in Woodlands of Southern Slopes of Elborz Mountains (Case Study: Latian Watershed). Iranian Journal of Forest, 2(2), 113–125. (In Persian with English abstract). (In persian)
Ren, H., Yang, L., & Liu, N. (2008). Nurse plant theory and its application in ecological restoration in lower subtropics of China. Progress in Natural Science, 18(2), 137–142.
Stark, H., Nothdurft, A., Block, J., & Bauhus, J. (2015). Forest restoration with Betula ssp. and Populus ssp. nurse crops increases productivity and soil fertility. Forest Ecology and Manage

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  • تاریخ دریافت: 13 خرداد 1402
  • تاریخ پذیرش: 13 خرداد 1402

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