Volume 16, Issue 2 (8-2022)                   مرتع 2022, 16(2): 271-283 | Back to browse issues page

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Hossein jafari S, Khodad Saryazdi H, Elmi M R. The effect of Yazd-Eghlid railway construction on diversity and richness of shrub and Bush-tree rangelands in Yazd province. مرتع 2022; 16 (2) :271-283
URL: http://rangelandsrm.ir/article-1-951-en.html
Department of Environment, Faculty of Natural Resources and Desert Studies, Yazd University, Yazd
Abstract:   (1275 Views)
Background and objectives: Construction of roads, including the construction of railways, is one of the important activities in the development of any country having a great impact on the economy of the country. It also affects rangelands due to its diverse and important ecosystem services. Without considering environmental impact the railway project could not protect the environment.  Inversely, could have negative effects on the environment around the railway.  For that, the study of the effect of the railway on rangeland ecosystems is very important.
methodology: This study investigated the effects of Yazd-Eghlid railway construction on the diversity and richness of vegetation of the rangelands of Kalmand-Bahadoran protected area. For this purpose, random-systematic sampling method is used in four types of vegetation: Artemisia sieberi, Cornulaca monacantha, Zygophylum eurypterum and Hammada salicornica at three distances from the railway (0-250 m, 250-500 m, 500-1000 m). Vegetation parameters and density were measured in each plot, so that inside each area, 4 100-meter transects were randomly placed and 2 plots at the beginning and end of each transect were systematically placed. According to the type and condition of vegetation in the study area,  25 square meters plots were used in Hammada salicornica and Zygophylum eurypterum type and 4 square meters plots in Artemisia sieberi and Cornulaca monacantha types. Within each plot and along each transect, the percentage of cover and the density were measured with the help of diversity and richness indices including Shannon & Simpson, Margalef & Menheni, uniformity and number. Data were calculated and analyzed using Spss software (version 16) and analysis of variance and Duncan test.
Results: The results of this study showed that the construction of the railway had effects on the diversity and richness of vegetation in the rangelands. In Artemisia sieberi type, railway construction had a significant effect (P <0.01) on the diversity, richness and number of vegetation percentage. they decreased at a distance of 0-250 m from the railway, but the construction of the railway did not have a significant effect on the diversity and richness indices obtained from the vegetation density data as well as the uniformity index. In Cornulaca monacantha type, railway construction had a significant effect on diversity indices (Shannon and Simpson) (P <0.01) and Margalf index obtained from vegetation percentage data (P <0.05). At the distance of 0-250 meters from the railway, these indicators increased. In the distances of 250-500 meters and 500-100 meters from the railway, these indicators decreased. Vegetation, for number and uniformity indices no significant effect was recorded. In the Zygophylum eurypterum, the construction of the railway only significantly increased the richness indices obtained from the data of vegetation density, manhine (P <0.01) and Margalf (P <0.05). At a distance of 0-250 meters from the railway and the construction of the railway had a significant effect on the indicators of diversity and richness of data. There was no percentage of vegetation, number or uniformity. in Hammada salicornica vegetation type, railway construction has not had a significant effect on any of the indicators of diversity and richness obtained from density data and vegetation percentage.
Conclusion: According to the results, it could be concluded that the construction of the railway leads to the growth of invasive, non-native and opportunistic species thus, increased diversity and richness in some areas. On the other hand, construction operations have led to the destruction of vegetation and reduced diversity and richness in some areas, which both cases threatens the biodiversity of rangelands, and it is suggested that rehabilitation and restoration programs be implemented. Plant pastures should be monitored and examined after the construction of the railway.
 
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Type of Study: Research | Subject: Special
Received: 2021/01/7 | Accepted: 2022/06/28 | Published: 2022/08/1

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