Note: This chapter was removed from the NCERT curriculum in the 2022 rationalization. Retained here as land degradation, soil conservation, water scarcity, and wildlife protection are core GS3 environment topics.

Why this chapter matters for UPSC: Land degradation, soil types, groundwater depletion, biodiversity hotspots, and wildlife conservation laws appear consistently in GS3. The soil classification map of India is essential for GS1 physical geography. India's forest cover data (ISFR 2023) and Project Tiger/Elephant statistics are standard Prelims questions.

PART 1 — Quick Reference Tables

Soil Type Region Best Crops Key Feature
Alluvial Ganga-Brahmaputra-Indus plains, coastal deltas Wheat, rice, sugarcane, cotton, oilseeds Most fertile; two types — khadar (new, light) and bhangar (old, dark)
Black / Regur Deccan Plateau (Maharashtra, MP, Gujarat, AP, Karnataka) Cotton (best), sorghum, linseed Formed from basalt lava; self-ploughing (swells when wet, cracks when dry); high clay and moisture retention
Red / Yellow Odisha, Chhattisgarh, Tamil Nadu, AP, parts of MP Groundnut, millets, tobacco Red colour from iron oxide (Fe₂O₃); yellow when hydrated; low fertility
Laterite AP, Karnataka, Kerala, Tamil Nadu, Meghalaya hills Tea, coffee, cashew, rubber Acidic; leached (silica removed); suitable for plantation crops; not good for food grains
Arid / Desert Rajasthan, parts of Gujarat, Punjab Drought-resistant millets, bajra Sandy, saline, low humus; requires irrigation
Forest / Mountain Himalayan slopes, NE India, Western Ghats Tea (Darjeeling), spices High humus; varies with altitude; immature
Wildlife Programme Year Details
Wildlife Protection Act 1972 Four schedules; hunting banned; CITES implementation
Project Tiger 1973 53 Tiger Reserves (2023); wild tiger count ~3,682 (2022 census)
Project Elephant 1992 33 Elephant Reserves; population ~29,964 (2017 census)
Project Snow Leopard 2009 Himalayan states; estimated ~718 in India
Project Crocodile 1975 Three species: mugger, gharial, saltwater crocodile
Biological Diversity Act 2002 National Biodiversity Authority (NBA), State Biodiversity Boards

PART 2 — Detailed Notes

Land Resources

Key Term

Land Use Categories (India):

  • Forest land: 24.84% of geographical area (ISFR 2023 — 8,27,357 sq km)
  • Land under non-agricultural use: Urban areas, roads, industries, settlements
  • Barren and wasteland: Rocky, arid, desert land not currently productive
  • Net Sown Area: Land sown with crops at least once in the agricultural year (~140 million hectares)
  • Current Fallow: Land left unsown in current year for soil restoration
  • Other Fallow: Land left uncultivated for 1–5 years
  • Permanent Pasture and Grazing Land
  • Land under Miscellaneous Tree Crops and Groves

India's Degraded Land: Approximately 120 million hectares of India's land is degraded. India has committed to Land Degradation Neutrality (LDN) under the UNCCD (UN Convention to Combat Desertification, adopted 1994) — restoring 26 million hectares of degraded land by 2030.

UPSC Connect

UPSC GS3 — Land Degradation Causes:

  • Soil erosion by water: Sheet erosion (gentle slopes), rill erosion (small channels), gully erosion (deep channels — Chambal ravines/badlands of MP/UP/Rajasthan)
  • Wind erosion: Thar Desert; desertification — advancing ~1 km/year in some regions
  • Waterlogging: Punjab and Haryana — excess canal irrigation raises water table; root zone anaerobic; affects ~8.5 million hectares
  • Salinization/Alkalinization: Irrigation without drainage → salts accumulate in topsoil — "usar" or "reh" soils in UP; affects ~6.7 million hectares
  • Shifting cultivation (Jhum): NE India — slash and burn; soil exposed to erosion; fertility drops quickly after 2-3 years
  • Overgrazing: Common land degradation; destroys vegetative cover; ~0.69 million sq km affected
  • Mining and quarrying: Open-cast mining leaves barren pits; acid mine drainage; Jharkhand, Odisha, Goa

Land Reforms in India:

  1. Zamindari Abolition (1950s): Intermediaries removed; land rights to actual tillers
  2. Tenancy reforms: Security of tenure, fair rent (~25% of produce), right to purchase
  3. Land ceiling laws: Maximum land any family can hold; surplus redistributed to landless
  4. Bhoodan Movement (Vinoba Bhave, 1951): Voluntary donation of land by wealthy to landless; ~4.4 million acres donated
  5. Operation Barga (West Bengal, 1978): Registration of sharecroppers; ensured security of tenure

Soil Resources

Key Term

Soil Erosion Types:

  • Gully erosion: Running water cuts deep channels through soil — creates "ravines" (khadar/bad lands); Chambal valley in MP, UP, Rajasthan is the classic example
  • Sheet erosion: Thin layer of soil removed over wide area by rainwater runoff — less visible but widespread
  • Wind erosion: Deflation (blowing away of fine particles), abrasion (sandblasting effect), deposition — Thar Desert and dust storms

Soil Conservation Methods:

  • Contour ploughing: Ploughing along contour lines (not up/down slope) — reduces runoff velocity
  • Terrace farming: Step-like fields on steep slopes — Himalayan hills; reduces slope length and runoff
  • Strip cropping: Alternate strips of crops and grass — breaks wind and water flow
  • Shelter belts (windbreaks): Rows of trees planted perpendicular to wind direction — Rajasthan, Punjab
  • Check dams: Small dams across gullies — slow water, trap sediment, recharge groundwater
  • Afforestation and reforestation: Permanent vegetation cover
  • Crop rotation: Alternating nitrogen-fixing crops (legumes) with depleting crops — restores soil health

Water Resources

UPSC Connect

UPSC GS3 — Water Scarcity and Management:

India's Water Balance:

  • Annual precipitation: ~4,000 BCM (billion cubic metres)
  • Utilisable water (surface + groundwater): ~1,123 BCM
  • Surface water utilizable: ~690 BCM; Groundwater: ~433 BCM
  • India is the world's largest groundwater extractor — ~250 BCM/year (25% of global extraction)

Water Stress Thresholds (Falkenmark Index):

  • Water Scarcity: < 1,000 m³/capita/year
  • Water Stress: < 1,700 m³/capita/year
  • India's per capita availability: ~1,486 m³/year (2021) — already in water stressed category

Groundwater Crisis:

  • 21 major Indian cities will run out of groundwater by 2020 (NITI Aayog report, 2018)
  • CGWB (Central Ground Water Board) classifies blocks as: Safe, Semi-critical, Critical, Over-exploited
  • Over-exploited blocks: Punjab, Haryana, Rajasthan have highest groundwater over-extraction

Water Conservation in India:

  • Jal Shakti Ministry (formed 2019, merged Jal Sansadhan + Drinking Water/Sanitation)
  • Jal Jeevan Mission: Functional household tap connections (FHTC) to all rural households by 2024
  • AMRUT (Atal Mission for Rejuvenation and Urban Transformation): Urban water and sewerage
  • Pradhan Mantri Krishi Sinchayee Yojana (PMKSY): "Har Khet Ko Paani, More Crop Per Drop"
  • Atal Bhujal Yojana: Groundwater management in water-stressed areas (7 states)

Natural Vegetation and Wildlife

Explainer

India's Forest Cover (ISFR 2023 — India State of Forest Report):

  • Total forest and tree cover: 8,27,357 sq km = 25.17% of geographical area
  • Actual forest cover (excluding tree cover): 7,15,343 sq km = 21.76%
  • Target under Forest Policy 1988: 33% forest cover
  • States with highest forest cover: Madhya Pradesh, Arunachal Pradesh, Chhattisgarh, Odisha, Maharashtra
  • States with highest % forest cover: Mizoram (~85%), Arunachal Pradesh (~79%), Meghalaya (~76%)

Champion and Seth Classification (1936, revised): India's forest types classified into 16 major types and 221 sub-types. Major categories:

  1. Tropical Wet Evergreen (Western Ghats, NE, Andaman)
  2. Tropical Semi-Evergreen
  3. Tropical Moist Deciduous (teak — most widespread valuable forest)
  4. Tropical Dry Deciduous
  5. Tropical Thorn Forests (Rajasthan, Gujarat)
  6. Montane Subtropical
  7. Himalayan Temperate (oak, rhododendron, deodar)
  8. Alpine (above treeline — juniper, birch)

India's Biodiversity Hotspots (4 out of 36 global hotspots):

  1. Eastern Himalayas (includes parts of NE India, Bhutan, Nepal)
  2. Western Ghats (Karnataka, Kerala, Tamil Nadu, Goa, Maharashtra)
  3. Indo-Burma (NE India, Myanmar, parts of S China — most threatened)
  4. Sundaland (Nicobar Islands only — mostly Indonesia/Malaysia)

Wildlife Conservation — Key Legislation:

  • Wildlife Protection Act, 1972: Schedules I-IV (I = highest protection — tiger, elephant, snow leopard, one-horned rhino); CITES species protection; creation of protected areas
  • Forest (Conservation) Act, 1980: Prior central government approval for diversion of forest land for non-forest purposes
  • Biological Diversity Act, 2002: National Biodiversity Authority (Chennai); access and benefit sharing; protection of traditional knowledge
  • Environment Protection Act, 1986: Umbrella legislation post-Bhopal gas tragedy

Exam Strategy

Prelims traps:

  • Black soil = Regur = formed from Deccan basalt; NOT from alluvium — do not confuse with alluvial
  • Laterite soil is acidic and leached — good for plantation crops (tea, coffee) NOT food grains
  • ISFR 2023: 25.17% total forest + tree cover; 21.76% actual forest cover — exam usually asks for the higher figure
  • India has 4 biodiversity hotspots, not 3 — remember Sundaland (Nicobar Islands)
  • Project Tiger (1973) — current count ~3,682 (2022 All India Tiger Estimation); MP has most tigers
  • UNCCD ≠ UNFCCC ≠ CBD — three different conventions; UNCCD is for desertification

Mains angles:

  • Land degradation → farmer distress → Mains GS3
  • Soil conservation methods → interlinkage with water conservation and agriculture
  • Biodiversity hotspots → Western Ghats panel/Gadgil Commission report controversy (GS3)
  • Project Tiger success story — model for conservation

Previous Year Questions

Prelims:

  1. Which one of the following is the correct sequence of soil types found in India from north to south along the eastern coast?
    (a) Alluvial, red, black, laterite
    (b) Alluvial, red, laterite, black
    (c) Red, alluvial, black, laterite
    (d) Red, laterite, alluvial, black

  2. Consider the following statements about India's biodiversity hotspots:

    1. India has four of the world's 36 recognized biodiversity hotspots.
    2. The Western Ghats and the Indo-Burma hotspot are among them.
      Which of the above statements is/are correct?
      (a) 1 only
      (b) 2 only
      (c) Both 1 and 2
      (d) Neither 1 nor 2

Mains:

  1. What are the main causes of land degradation in India? Discuss the measures for its conservation with special reference to rainfed agriculture. (CSE Mains 2017, GS Paper 3, 15 marks)
  2. How does the degradation of soil affect the productivity of agricultural land? Suggest measures to restore soil health. (CSE Mains 2022, GS Paper 3, 15 marks)