Ecological Influence of Forest Roads on Biodiversity (Case Study: Zilky Forest Management Plan in Roudbar Province)

Subject Areas : environmental management

Morad Hajipour ¹ , Farshad Keivan Behjou ² , Ramin Naghdi ³ , Zeinab PourGholi ⁴ , Sedighe Ghanaei ⁵

1 - M.Sc. Graduated student in Silviculture and Forest ecology, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran
2 - Professor, Department of Forest Sciences and Engineering, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran*
3 - Professor, Department of Forestry and Forest Economics, Faculty of Natural Resources, University of Guilan, Somehsara, Iran
4 - Ph.D. Student of Forest silviculture and Ecology, University of Gorgan, Gorgan, Iran
5 - Research in statute of forest and Rangeland,Agriculture Research,Eduction and Eextension Organization(AREEO),Tehran,Iran

Received: 2017-07-13 Accepted : 2018-12-12 Published : 2021-03-21

Keywords: downstream, upstream, Biodiversity, Forest Roads, Zilky Forest, richness,

Abstract :

Background and Objective: Road construction in forest ecosystems cause the microclimate, light regime to be changed and thus reduce light competition adjacent to the roads that provide the access to solar radiation for a variety of the plants. So the density and stock of plants around the road is increased by fast-growing and shade intolerant species which changes the diversity of plant species in the forest ecosystem. The aim of this study is to evaluate the ecological effect of forest roads on wooden tree and shrub species in Zilakyrood region of Roodbar.Material and Methods: In this study, a part of forest roads in Series 4 of Zilakirood at the age of 18 was selected in terms of homogeneity of height, aspect and slope changes and species composition status with sufficient length (500 m). In this road, 6 transects were designed and  parallel plots were implemented at intervals of 1, 5, 10, 30 and 50 meters, with dimensions of 2 in 10 meters. The number and type of wooden tree and shrub species were sampled. Diversity index of Simpson, richness index of Menhinic and evenness index of Pilow were calculated using Ecological methodology software. To compare the parameters of species biodiversity, after normalization of data, paired t-test was used and to determine whether the differences in sample plots are significant or not, ANOVA and Duncan test was used.Findings: The results of this study showed that a there is no significant difference between downstream and upstream edge of the forest roads in terms of Simpson diversity index, Menhinic richness and evenness Pilow indices (to a depth of 50 m in Forest). But there is a significant difference in terms of wood species richness in plots between various distances of downstream and upstream of roads in the study area at 95% probability. Also, the highest species richness was at the downstream and upstream of roads, respectively at the distance of 5 and 1 meter from the edge of the road.Discussion and Conclusions: Since the roads as the access routes to forest ecosystems are important both for humans and invasive plant species, road ecology studies is very important and valuable to monitor and control the impact of forest roads on biodiversity. So, the knowledge about the flora and edaphic conditions is essential to minimize the damage to vegetation and soil in the region influenced by forest roads.

References:

1. Saunders, S.C., Mislivets, M.R., Chen, J., and Cleland, D.T. (2002). Effects of roads on landscape structure within nested ecological units of the Northern Great Lakes Region, USA. Biological Conservation, 103: 209–225.


2. Burroughs, E.R., Marsden, M.A., and Haupt, H.F. (1972). Volume of snowmelt intercepted by logging roads. Journal of Irrigation and Drainage Engineering, 98:1-12.

1. Rummer, R.B., Stokes, B., and Graeme, L. (1997). Sedimentation associated with forest road surfacing in a bottomland hardwood ecosystem. Forest Ecology and Management, 90: 195-200.


2. Venkatram, A., Isakov, V., Thoma, E., and Baldauf, R. 2007. Analysis of air quality data near roadways using a dispersion model. Atmos. Environ. 41:40.9481-9497.


3. Karim, M.N., and Mallik, A.U. 2008. Roadside revegetation by native plants I. Roadside microhabitats, floristic zonation and species traits. Ecol. Eng. 32:3.222-237.


4. Lamont, B.B., and Southall, K.J. 1982. Biology of mistletoe Amyema preissii on road verges and undisturbed vegetation. 13:87-88.


5. Parendes, L.A., and Jones, J.A. 2000. Role of light availability and dispersal mechanisms in invasion of exotic plants roads and streams. Conserv. Biol. 14:1.64-75.


6. Avon, C., Bergès, L., Dumas, Y. and Dupouey, J.L. 2010. Does the effect of forest roads extend a few meters or more into the adjacent forest? A study on understudy plant diversity in manage oak stands, 259: 8. 1546-1555.

9. Megahan, W.F. 1988. Effects of forest roads on watershed function in mountainous areas, Symposium on environmental geotechnical and problematic soils and rocks. Proceedings, Pp: 335-348.


10. Lamont, B.B., Whitten, V.A., Witkowski, E.T.F., Rees, R.G., and Enright, N.J. 1994b. Regional and local (road verge) effects on size and fecundity in Banksia menziesii. Aust. J. Ecol. 19:197-205.


11.  Zare, H. and Habashi, H. 2000. Alnus sp.as an ecological species of the northern forest, Journal of forests and rangelands, institute of forests and rangelands research, 48: 55-63.

14. Unknown, 1993. Booklet of forestry projects of Kolang Diar and Sistan, Series 4 of twenty-third watershed in Zilaki rood of Rudbar, Gilan province, forests, rangelands and watershed management organization, 320 pages.

15. Bazyari, M., Jalilvand, H., Kooch, Y. and Hosseini, A., 2014. Ecological effects of forest roads on biodiversity and floristic composition (case study; leeresar,