A Comprehensive Assessment of Burn Severity and Vegetation Health Dynamics in Amritsar District Using Sentinel-2 Data

In the fertile plains of northern India, the land is a living tapestry woven from soil, water, and the crops that feed millions. For decades, scientists have watched this landscape change, using satellites to track the health of the green cover that blankets the earth. Two specific tools have become essential for this work: one measures how well plants are growing, and the other acts like a scar detector, identifying where the land has been scorched by fire. When farmers harvest their crops, they sometimes burn the leftover stalks to clear the fields quickly. While this is a common practice, it leaves a mark on the environment, turning vibrant green fields into ash and smoke. Understanding exactly where these fires happen, how intense they are, and how long it takes for the land to heal is crucial for protecting the air we breathe and the soil that feeds us.

A team of researchers from the Indian Institute of Technology Roorkee turned their attention to the Amritsar district, a region in Punjab known for its rich agricultural output. They wanted to move beyond simple counts of fires and instead create a detailed, year-by-year picture of how burning affects the land and how the vegetation responds over time. Using high-resolution images from the European Space Agency's Sentinel-2 satellites, they examined the area between 2021 and 2024. Their goal was to see the story of the land not just as a single event, but as a dynamic process of damage and recovery. By comparing images taken before the harvest season with those taken after, they could map the exact boundaries of the burned areas and measure the drop in plant health with remarkable precision.

The results revealed a landscape that is far from static, with the intensity of fire and the speed of recovery shifting significantly from one year to the next. The year 2024 stood out as the most severe for burning. In that year, the data showed the deepest drop in the health of the land, with the most intense burning recorded across the district. The researchers found that the fire impact was widespread, leaving a broad trail of damage that lowered the overall health of the vegetation more than in any other year of the study. However, the story of 2022 was different. While the burning was not as uniformly severe as in 2024, the land showed the most chaotic and varied response. Some areas were hit hard, while others seemed to recover quickly or were affected by different types of land changes. This year displayed the widest range of conditions, suggesting that the fire did not behave the same way everywhere, and the land's reaction was equally unpredictable.

When the scientists looked at how the vegetation fared, a clear pattern of loss emerged, but with a glimmer of hope for the future. In 2022, the land suffered its most dramatic drop in green cover, losing a significant amount of its vitality in a single season. This was the year when the contrast between healthy plants and burned ground was starkest. Yet, by 2024, the situation had shifted. Although the fires were more intense that year, the overall decline in vegetation health was the smallest of the four years. This suggests that the land may be showing signs of resilience, or perhaps the fires, while fierce, did not destroy the root systems as completely as in previous years, allowing for a quicker bounce-back. The data indicates that the land is not just a passive victim of fire; it is a system that changes, heals, and reacts to the intensity of the disturbance in complex ways.

To understand the connection between the fire and the plants, the researchers compared the two measurements side by side. They found a very strong link: wherever the fire was most severe, the vegetation health dropped the most. This relationship was so consistent that in every single year studied, the two measurements moved in lockstep. When the land was scorched, the green cover vanished; when the land began to recover, the green returned. This tight connection confirms that the satellite tools are accurately capturing the real-world impact of the fires. The study also showed that while the patterns of fire and recovery are somewhat consistent from one year to the next, they do not stay the same forever. The areas that burned heavily in one year might not be the same ones that burn the next, and the speed of recovery changes depending on the year's specific conditions.

The findings paint a picture of a region where fire is a recurring force, but its effects are not uniform. The most severe burning happened in 2024, yet the most chaotic and varied landscape changes occurred in 2022. The land is capable of recovering, as seen in the smaller decline in vegetation health in 2024, but the cycle of damage and healing is sensitive to the specific conditions of each year. For the people who manage this land, the message is clear: monitoring cannot be a one-time event. Because the fire patterns and the land's response change so much from year to year, continuous observation is necessary to understand the long-term health of the ecosystem. By using these advanced satellite tools, planners and policymakers can see exactly where the land is struggling and where it is healing, allowing them to develop better strategies to protect the environment and support the farmers who work the soil. The study underscores that while fire is a natural part of the agricultural cycle, its impact is a dynamic story that requires constant attention to be understood and managed effectively.