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An Assessment of the Relationships between Meteorological Drought Index and Vegetation Condition in Dry Farming in the Province of Lorestan | ||
| پژوهش های آبخیزداری | ||
| Article 7, Volume 34, Issue 2 - Serial Number 131, June 2021, Pages 77-90 PDF (1.16 M) | ||
| Document Type: Research | ||
| DOI: 10.22092/wmej.2020.342647.1332 | ||
| Authors | ||
| Tahereh Sadat Mirmohammadhosseini1; Bagher Ghermezcheshmeh* 2; Seyed Abbas Hosseini1; Ahmad Sharafati1 | ||
| 1Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran | ||
| 2Soil Conservation and Watershed Management Institute, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran | ||
| Abstract | ||
| Effect of meteorological drought on vegetation conditions and their relationships with each other was investigated in the Province of Lorestan. The standard precipitation index (SPI) as a meteorological drought index was used for 28 rain gauging stations during the years 1987-2017 in that province. Benefiting from the remote sensing and MODIS images, the normalized difference vegetation index (NDVI) was extracted for the years 2000-2017 and the vegetation condition index (VCI) was calculated. Using the SPI results, the dry, normal and wet years were identified and the index year was selected for them. The correlation between the SPI and VCI was investigated using linear regression. The results indicated that the highest correlation coefficient of Pearson was related to the VCI in March with a 9-month SPI in November was equal to 0.64; the correlation coefficient between the multivariate linear regressions of the SPI with VCI in June was 0.7. The results of multivariate linear regression indicated that the SPI had a significant correlation with the VCI at the five percent level over a period of 9 and 12 months. A confusion matrix was used to evaluate the compatibility of the SPI drought classes with the VCI; the results also indicated that the highest compliance of the VCI with the SPI was in the moderate drought class. Furthermore, the results of this study indicated a 9-month delay in the meteorological drought index with satellite drought index at the 5 % level significance of the SPI with the VCI, which indicates that the VCI may be used in the absence of meteorological indicators for the study area. | ||
| Keywords | ||
| Lorestan; Normalized Difference Vegetation Index (NDVI); Vegetation Condition Index (VCI); Standardized Precipitation Index (SPI) | ||
| References | ||
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