Understanding India's Forest Cover Changes (2011-2021)

India's forest cover is regularly assessed, providing valuable insights into the state of its forests. While the overall forest cover area in India showed an increase between 2011 and 2021, changes occurred within different categories of forests.

Forests are typically classified based on their canopy density. The main categories discussed in the context of India's forest reports are:

• Very Dense Forest (VDF): Canopy density is 70 percent or more.
• Moderately Dense Forest (MDF): Canopy density is between 40 percent and less than 70 percent.
• Open Forest (OF): Canopy density is between 10 percent and less than 40 percent.
• Scrub: Canopy density is less than 10 percent. (Often considered separate from 'forest cover' in total calculations)

The question asks specifically about the period between 2011 and 2021 and which forest category experienced a decrease in area during this time, despite the overall increase in total forest cover area.

Data from forest assessments, such as the India State of Forest Report (ISFR) reports covering this period, consistently show a trend:

• The area under Very Dense Forest has generally shown an increase. This indicates efforts towards protection and regeneration are helping some areas become denser.
• The area under Moderately Dense Forest has shown a decrease. This decrease can be attributed to two main reasons: some areas of MDF might degrade and become Open Forest, while other areas of MDF might improve and become Very Dense Forest. The data suggests that the loss of MDF area due to degradation or conversion to other land uses has been significant during this period.
• The area under Open Forest has also generally shown an increase. This increase can result from the degradation of MDF areas or from afforestation/plantation activities on non-forest lands that haven't yet reached higher density levels.

Therefore, among the categories mentioned (Very Dense, Moderately Dense, Open), the Moderately Dense Forest category is the one that experienced a decrease in its area during the 2011 to 2021 period, even while the total forest cover area increased overall.

Based on the analysis of changes in forest cover categories between 2011 and 2021, the category that saw a decrease in area is the moderately dense forest.

Revision Table: Forest Cover Classification

Additional Information: Factors Affecting Forest Cover Change

Changes in forest cover area within different categories can be influenced by various factors:

• Conservation Efforts: Strict protection in certain areas can lead to the maturation and densification of forests, potentially converting MDF to VDF.
• Afforestation and Plantations: New plantations or natural regeneration can add to the Open Forest category initially, potentially moving to higher densities over time.
• Forest Degradation: Activities like unsustainable logging, grazing, forest fires, and encroachment can reduce canopy density, potentially converting VDF to MDF or MDF to OF or Scrub.
• Infrastructure Development: Projects like roads, dams, and buildings can lead to the felling of trees and loss of forest area.
• Climate Change: Can influence forest health, vulnerability to fires, pests, and diseases.
• Shifting Cultivation: Can cause temporary loss and regeneration cycles in certain regions.

Understanding these dynamics is crucial for effective forest management and conservation planning in India.