Integrated Monitoring and Assessment of Agricultural Drought Using Satellite and Meteorological Data: A Case Study of Lorestan Province, Iran

Drought and its impacts are among the most critical natural hazards, causing substantial agricultural losses and threatening rural livelihoods. This study investigates the effects of drought on croplands and rangelands in Lorestan Province, Iran, using field surveys, statistical analyses, and remote sensing techniques. Data included characteristics of rainfed and irrigated agriculture, water resource attributes, land use maps, and drought indices from meteorological and satellite sources. Relationships between the meteorological drought index (SPI) and vegetation indices (VCI, TCI, VHI) were analyzed using correlation coefficients and linear regression models. Results showed a positive relationship between crop yields, particularly wheat and barley, and drought indices during ۱۹۹۱–۲۰۱۷. The highest correlations occurred at time scales of one to six months and weakened at longer scales. Increased moisture and thermal stress reduced agricultural productivity and raised irrigation water demand. For rangelands, winter sites showed the strongest correlations between vegetation indices and SPI in April and May. Mid-altitude rangelands displayed no significant relationships during drought periods. In summer rangelands, VCI and VHI had relatively strong relationships with SPI from February to May.

کلیدواژه ها:

Precipitation ، Drought ، Remote Sensing ، Irrigated Agriculture ، Rainfed agriculture