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Assesment of the Standard Index of Annual Precipitation,Standardized Precipitation Index and Palmer Drought Severity Index in the Rangelands of Qom Province

    Authors

    • Maryam Azarakhshi
    • Behnoush Farokhzadeh
    • Mohammad Mahdavi
    • Hossein Arzani
    • Hassan Ahmadi
,
10.22059/jrwm.2012.30009
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Abstract

Iran is located in dry belt of the earth and always involved with drought in different sections. Drought has already caused many losses to natural plant cover, agriculture and human society. For drought monitoring, we can use some drought indecies. In this research, the Standard Index of Annual Precipitation)SIAP),Sandardized Precipitation Index (SPI) and Palmer Drought Severity Index (PDSI) were used for assessment of drought effects on rangeland plant production. The research area is located in Qom province that contains eight rangeland sites. Plant production and soil factors were measured in rangeland readiness period from 1997-1998 to 2005-2006 annualy. Regression techniques were used between drought indices and total production and also production of different vegetation forms in seven time scales (early March to late July (growth season) and early February to late July (growth season and the previous month), March to June, March to May, March to April and March (start of growth season). The best drought index was then selected based on the highest correlation coefficient and lowest standard error. The result showed that the best drought indices in Qom rangelands are SPI-3, PDSI, SPI-24 and SPI-6, respectively. Also the most significant time step was resulted growth season and specially early stage of growth season.

Keywords

  • Drought
  • Forage production
  • Palmer Drought Severity Index
  • Qom province
  • Regression
  • Standard Index of Annual Precipitation
  • Standardized Precipitation Index
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Journal of Range and Watershed Managment
Volume 65, Issue 2 - Serial Number 1339218
September 2012
Pages 159-174
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  • PDF 220.75 K
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How to cite
  • RIS
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Statistics
  • Article View: 3,499
  • PDF Download: 1,963

APA

Azarakhshi, M., Farokhzadeh, B., Mahdavi, M., Arzani, H., & Ahmadi, H. (2012). Assesment of the Standard Index of Annual Precipitation,Standardized Precipitation Index and Palmer Drought Severity Index in the Rangelands of Qom Province. Journal of Range and Watershed Managment, 65(2), 159-174. doi: 10.22059/jrwm.2012.30009

MLA

Maryam Azarakhshi; Behnoush Farokhzadeh; Mohammad Mahdavi; Hossein Arzani; Hassan Ahmadi. "Assesment of the Standard Index of Annual Precipitation,Standardized Precipitation Index and Palmer Drought Severity Index in the Rangelands of Qom Province". Journal of Range and Watershed Managment, 65, 2, 2012, 159-174. doi: 10.22059/jrwm.2012.30009

HARVARD

Azarakhshi, M., Farokhzadeh, B., Mahdavi, M., Arzani, H., Ahmadi, H. (2012). 'Assesment of the Standard Index of Annual Precipitation,Standardized Precipitation Index and Palmer Drought Severity Index in the Rangelands of Qom Province', Journal of Range and Watershed Managment, 65(2), pp. 159-174. doi: 10.22059/jrwm.2012.30009

VANCOUVER

Azarakhshi, M., Farokhzadeh, B., Mahdavi, M., Arzani, H., Ahmadi, H. Assesment of the Standard Index of Annual Precipitation,Standardized Precipitation Index and Palmer Drought Severity Index in the Rangelands of Qom Province. Journal of Range and Watershed Managment, 2012; 65(2): 159-174. doi: 10.22059/jrwm.2012.30009

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