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The effects of climate variability on canopy cover percentage of forage species in Ghosheh steppe Rangelands, Semnan Province | ||
| تحقیقات مرتع و بیابان ایران | ||
| Article 17, Volume 26, Issue 3, September 2019, Pages 717-730 PDF (844.85 K) | ||
| Document Type: Research Paper | ||
| DOI: 10.22092/ijrdr.2019.120019 | ||
| Authors | ||
| Nahid Azizi1; Hamed Joneidi* 2; Khaled Osati3 | ||
| 1MSc student, Department of Range and Watershed Management, College of Natural Resources, University of Kurdistan,Sanandaj, Iran | ||
| 2Assistant professor, Department of Range and Watershed Management, College of Natural Resources,University of Kurdistan,sanangdaj,Iran | ||
| 3Assistant professor, Department of Range and Watershed Management, College of Natural Resources, University of Kurdistan,sanangdaj,Iran | ||
| Abstract | ||
| This research monitored changes in canopy cover percentage of typical species during a 10-year period in the Ghosheh rangelands to find out the relationship between two important climate variables (precipitation and temperature) and canopy cover changes. Therefore, the canopy cover percentages of six typical species (separately) and annual species (overall) were measured during 10 years at the end of growing season in thirty 2-m2 plots, distributed along two 250–m transect lines. The results demonstrated that the maximum canopy cover percentage for water year 2006-2007 (wet-year) and the minimum value for water year 2012-2013 (drought) were 15% and 5.5%, respectively. The canopy cover percentage modeling was performed based on linear regression method using precipitation and temperature variables. The precipitation of April explained 65% of changes in canopy cover percentage of A. sieberiat 95% confidence level (RRMSE = 0.26 & MAE=0.49). The best simple linear regression model for estimating canopy cover percentage of S. barbata and Z. eurypterum was introduced by total precipitation of March-June and precipitation of March, representing 77% (at 99% confidence level) and 67% (at 95% confidence level) of changes in canopy cover, respectively. Considering the dominant role of A. sieberi, S. barbata and Z. eurypterum in vegetation composition of study areas, it can be concluded that most changes in canopy cover of the studied rangeland are predictable by variabilityofprecipitation during growing seasons. | ||
| Keywords | ||
| Canopy cover; Climatic variability; Precipitation; Linear regression; Ghosheh | ||
| References | ||
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