In the North East region of India, during the process of jhum cultivation, forests are cleared by burning and left for regrowth after a year of cultivation. How would you explain the regrowth of forest in ecological term?

When the forests are cleared by burning and left for regrowth after a year of cultivation it has been observed that the soil nutrient levels have increased. This is due to the increased microbial activity which improves the soil quality by increasing inorganic minerals content in the soil. This phenomenon is known as secondary succession.