Annual and seasonal precipitation characteristics in the Saharo-Sindian vegetation region

Document Type : Research Paper

Authors

1 Department of Forestry and Forest Economics, Faculty of Natural Resources, University of Tehran, Karaj, Iran.

2 Department of Reclamation of Arid and Mountainous Region, Faculty of Natural Resources, University of Tehran, Karaj, Iran.

10.22059/jfwp.2024.369765.1277

Abstract

In the present study, we detected the characteristics of precipitation (the amount and the number of events) in the Saharo-Sindian vegetation region located in the south and southeast of Iran over the last three decades. Daily precipitation data during 1987-2019, recorded by eighteen meteorological stations were analyzed. The Mann-Kendall (MK) test was used for trend analysis. Over the past thirty-three years, the mean annual precipitation was 214 mm (SD: 61 mm). Mean maximum and minimum yearly precipitations were recorded in Dogonbadan (439 mm) and Iranshahr (109 mm), respectively. Out of the eighteen stations, only two stations, Ramhormoz and Kish Island, showed significant annual precipitation trends (11% of the total trends). During 33 years, a total of 17275 events (mean event: 7.5 mm; SD: 6.9 mm) were recorded in the stations. The correlation coefficient (r) between the amount of precipitation and the number of events varied from 0.41 to 0.86 (mean: 0.67; SD: 0.13). We found that 83% of the mean annual precipitation occurred during the autumn and winter seasons. The highest and lowest yearly precipitations fell within the 20-40 mm (21%, 45 mm) and over 40 mm (30%, 64 mm) classes, respectively. Over the past three decades, the mean number of dry days per year was 336. Any changes in precipitation characteristics severely impact the vulnerable forest ecosystems in the Saharo-Sindian vegetation region.

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References

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Forest and Wood Products
Volume 77, Issue 1
June 2024
Pages 1-11

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