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Land Degradation: Causes, Impacts and Way Forward | UPSC Environment Notes

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Land Degradation

Land degradation refers to the decline in the quality and productive capacity of land due to factors such as soil erosion, deforestation, overgrazing, unsustainable agriculture, mining, urbanisation and climate change. It affects the ability of land to support crops, forests, biodiversity, water recharge and livelihoods. Since land is the foundation of food security, ecological balance and rural economy, its degradation becomes a major environmental and developmental challenge. 

Causes of Land Degradation

  • Deforestation
    • Removal of forest cover exposes soil to wind and water erosion.
    • Tree roots bind the soil, maintain moisture and support nutrient cycling. When forests are cleared for agriculture, mining, infrastructure or settlements, the soil becomes loose and vulnerable to degradation.
    • Tree removal on slopes leads to landslides and gully erosion — Western Ghats, Himalayas 
  • Soil Erosion
    • Soil erosion is one of the most important causes of land degradation.
    • Running water, wind and floods remove the fertile topsoil layer, which contains nutrients and organic matter.
  • Agricultural Causes 
    • Overuse of chemical fertilisers — destroys soil microbiome, acidifies soil, reduces organic matter 
      • Heavy use of fertilisers, pesticides and insecticides affects soil structure and soil biodiversity.
      • It can reduce beneficial microbes, earthworms and organic matter.
      • Over time, the soil may become less fertile and more dependent on external inputs.
    • Monoculture farming — continuous cultivation of same crop depletes specific nutrients, reduces biodiversity 
    • Overgrazing — removes vegetation cover, compacts soil, accelerates erosion; 
    • Improper tillage — deep ploughing breaks soil structure, increases erosion vulnerability 
    • Continuous cropping without replenishing nutrients leads to nutrient depletion.
    • Stubble burning — destroys soil microorganisms and organic matter 
    • Shifting cultivation (Jhum) — traditional slash-and-burn in Northeast India; when rotation period too short, land cannot recover 
    • Faulty Irrigation Practices
      • Excessive irrigation without proper drainage causes waterlogging and salinisation.
      • When water evaporates from the soil surface, salts remain behind and accumulate.
      • This makes soil unsuitable for cultivation in the long run.
    • Overgrazing
      • Excessive grazing by livestock removes grass cover and compacts the soil.
      • Without vegetation, soil becomes exposed to erosion.
      • Overgrazing also reduces natural regeneration of plants and may gradually lead to desertification.
  • Mining and Quarrying
    • Mining removes vegetation, disturbs soil layers and leaves behind overburden, pits and toxic waste.
    • Open-cast mining causes severe land disturbance and may contaminate soil and water with heavy metals.
      • Open-cast coal mining in Jharkhand, Odisha; iron ore in Goa; leaves behind barren, toxic spoil heaps 
  • Urbanisation and Infrastructure Development
    • Expansion of cities, roads, industries and construction activities converts fertile agricultural land into built-up areas.
      • Construction activities — strip topsoil, leave compacted, structureless subsoil 
    • Unplanned urbanisation also leads to soil sealing, loss of wetlands, waste dumping and reduced groundwater recharge.
  • Industrial Pollution
    • Industrial waste, fly ash, hazardous chemicals and heavy metals degrade soil quality.
      • Industrial contamination — heavy metals (chromium from tanneries, arsenic from coal ash) render land permanently unusable 
    • Polluted land becomes unsafe for agriculture and can contaminate groundwater.
  • Waste Dumping
    • Improper disposal of municipal solid waste, plastic waste, biomedical waste and e-waste contaminates land.
    • Leachate from waste dumps can pollute soil and groundwater.
  • Climate Change
    • Climate change worsens land degradation through rising temperatures, droughts, erratic rainfall, floods and extreme weather events.
    • Drought reduces vegetation cover, while intense rainfall increases soil erosion.
    • Sea level rise — coastal land salinisation; Sundarbans, Kerala coast, Odisha delta 
    • Rising temperatures — accelerates evaporation, reduces soil moisture, increases desertification 
    • Changing rainfall patterns — intense rainfall events increase surface runoff and erosion

Impact of Land Degradation

  • Environmental Impact
    • Land degradation reduces soil fertility, vegetation cover and biodiversity.
    • It weakens ecosystem services such as nutrient cycling, water filtration, carbon storage and habitat support.
    • Degraded land is more vulnerable to erosion, droughts and desertification.
  • Agricultural Impact
    • Loss of fertile topsoil and soil nutrients reduces crop productivity.
    • Farmers are forced to use more fertilisers and irrigation to maintain output.
    • In severe cases, land may become unfit for cultivation.
  • Food Security Impact
    • Declining land productivity affects food production.
      • This can increase food prices, reduce farm incomes and threaten food security, especially for vulnerable communities.
  • Water Security Impact
    • Degraded land has lower water-holding capacity.
    • It reduces groundwater recharge and increases surface runoff.
    • This can worsen both floods and droughts.
    • Soil erosion also increases siltation in rivers, lakes, reservoirs and dams, reducing their water storage capacity.
  • Economic Impact
    • Land degradation reduces agricultural income, increases input costs and lowers rural productivity.
    • It also increases public expenditure on soil conservation, irrigation, disaster relief and restoration.
    • Degraded land affects sectors such as agriculture, forestry, livestock and tourism.
  • Livelihood Impact
    • Farmers, pastoralists, forest-dependent communities and rural labourers are directly affected.
    • Reduced productivity can lead to poverty, indebtedness, migration and livelihood insecurity.
  • Biodiversity Impact
    • Loss of vegetation and soil health affects plants, insects, birds, animals and microorganisms.
    • Habitat degradation leads to decline in species diversity.
    • Soil biodiversity, including microbes and earthworms, is also damaged.
  • Climate Change Impact
    • Healthy soil stores carbon, but degraded soil loses organic carbon into the atmosphere.
    • Land degradation therefore contributes to climate change.
    • At the same time, climate change further accelerates land degradation, creating a vicious cycle.
  • Disaster Impact
    • Degraded land increases vulnerability to floods, droughts, landslides and dust storms.
    • Loss of vegetation increases runoff and soil erosion during heavy rainfall.
    • In hilly areas, land degradation can increase landslide risk.
  • Social Impact
    • Land degradation can create conflict over land, water, grazing areas and forest resources.
    • It may force people to migrate from degraded regions.
    • Women and marginal farmers are often affected more because they depend heavily on local natural resources.

Challenges in Addressing Land Degradation

  • Fragmented Governance
    • Land is linked with agriculture, forests, water, mining, rural development, urban planning and environment.
    • Different departments handle different aspects, leading to poor coordination.
  • Pressure of Population and Development
    • Growing demand for food, housing, roads, industries and infrastructure puts pressure on land.
    • This often leads to conversion of agricultural land, forests and wetlands.
  • Poverty and Dependence on Land
    • Poor communities depend directly on land, forests and grazing areas for survival.
    • They may overuse land resources due to lack of alternatives.
    • Thus, land degradation is both a cause and consequence of poverty.
  • Unsustainable Farming Practices
    • Farmers may continue practices like excessive irrigation, monocropping and overuse of chemical inputs due to market pressure, subsidy patterns and lack of awareness.
    • Changing these practices requires incentives and extension support.
  • Weak Implementation of Land Use Planning
    • Many areas lack proper land-use planning.
    • Construction, mining, farming and industrial activities often take place without considering ecological suitability.
  • Difficulty in Restoring Degraded Land
    • Restoring degraded land is slow, costly and technically challenging.
    • Soil formation takes a long time, and once fertility is lost, recovery may require years of effort.
  • Climate Change
    • Increasing droughts, floods, heatwaves and erratic rainfall make land restoration more difficult.
    • Climate stress reduces vegetation recovery and accelerates soil erosion.
  • Lack of Awareness
    • Many people do not recognise soil as a living resource.
    • Soil conservation, organic matter management and sustainable land-use practices receive limited attention.
  • Inadequate Data and Monitoring
    • Reliable data on land degradation, soil health, erosion and desertification is often limited.
    • Without real-time monitoring, planning and restoration become weak.
  • Tenurial and Common Land Issues
    • Unclear land rights and poor management of common lands reduce incentives for conservation.
    • Community lands, grazing lands and wastelands are often overused or encroached upon.

Way Forward

  • Sustainable Land Use Planning
    • Land use should be planned according to ecological suitability.
    • Agriculture, industry, mining, urbanisation and infrastructure should be guided by proper land capability assessment.
    • Fragile ecosystems such as hills, wetlands, forests and drylands need special protection.
  • Soil and Water Conservation
    • Measures such as contour bunding, terracing, check dams, mulching, vegetative barriers and watershed management should be promoted.
    • These reduce erosion, improve moisture retention and support groundwater recharge.
  • Promote Sustainable Agriculture
    • Crop rotation, mixed farming, agroforestry, organic manure, natural farming, conservation agriculture and integrated nutrient management can improve soil health.
    • Balanced use of fertilisers and pesticides is necessary.
  • Control Overgrazing
    • Pasture development, rotational grazing and community management of grazing lands should be encouraged.
    • Fodder availability should be improved to reduce pressure on natural grasslands.
  • Afforestation and Reforestation
    • Tree plantation, shelterbelts, social forestry and restoration of degraded forests can reduce erosion and improve soil stability.
    • Native species should be preferred for ecological restoration.
  • Restore Degraded and Wastelands
    • Degraded lands should be restored through watershed development, soil treatment, vegetation regeneration and community participation.
    • Mine reclamation should be made mandatory after mining activities.
  • Improve Irrigation Practices
    • Efficient irrigation methods like drip and sprinkler irrigation should be promoted.
    • Proper drainage should be ensured to prevent waterlogging and salinity.
  • Strengthen Institutions and Governance
    • Coordination among agriculture, forest, water, rural development, mining and urban planning departments should be improved.
    • Land degradation should be addressed through an integrated landscape approach.
  • Community Participation
    • Local communities, panchayats, farmers and forest dwellers should be involved in land restoration.
    • Community ownership improves protection of common lands, grazing areas and water bodies.
  • Use Technology
    • Remote sensing, GIS mapping, drones and soil health cards can help identify degraded areas and monitor restoration efforts.
  • Climate-Resilient Land Management
    • Restoration efforts should consider droughts, floods and rising temperatures.
    • Climate-resilient crops, drought-resistant vegetation and watershed-based planning can reduce vulnerability.

Land degradation is not only an environmental issue but also an agricultural, economic, social and climate-related challenge. It affects soil fertility, food security, water availability, biodiversity, livelihoods and disaster resilience. Addressing it requires sustainable land-use planning, soil and water conservation, climate-resilient agriculture, afforestation, restoration of degraded lands, stronger institutions and community participation. Protecting land means protecting the foundation of food, water, livelihoods and ecological security.

Sample Mains Question

Q1. Land degradation is both an environmental and developmental challenge. Discuss.
(150 words, 10 marks)

Q2. Explain the major causes of land degradation in India. How does it affect food and water security?
(150 words, 10 marks)

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