Natural Vegetation of India

Subject: Geography | Unit: Physical Geography | Topic: Natural Vegetation Exam: AP Group 2 (APPSC)

Introduction

India is one of the world's 12 mega-biodiversity countries with ~47,000 plant species and ~15,000 flowering plants. The country's vegetation ranges from tropical evergreen rainforests receiving over 200 cm rainfall to thorny scrublands surviving on less than 70 cm. The National Forest Policy targets 33% forest cover, but actual cover stands at ~21%. Understanding vegetation types, their rainfall requirements, and India's conservation framework is essential for APPSC exams.

Context

Natural vegetation is a direct function of rainfall and temperature. As rainfall decreases across India: Evergreen > Deciduous > Thorn > Desert vegetation. Altitude creates vertical zonation in mountain regions. India's forests face pressures from deforestation, encroachment, and climate change, making the biosphere reserve and national park network critical for conservation.

Core Content

Five Major Vegetation Types

Tropical Evergreen Forests

• Rainfall >200 cm, short or no dry season; trees 60 m+ height; dense canopy
• Location: Western slope of Western Ghats, Andaman & Nicobar, NE India
• Key species: Rosewood, Mahogany, Ebony, Rubber, Cinchona
• Animals: Elephant, monkey, lemur, deer, one-horned rhino

Tropical Deciduous Forests — Most Widespread

Moist Deciduous (100-200 cm): Most commercially exploited; trees shed leaves for 6-8 weeks

• Location: Eastern slopes of Western Ghats, NE states, Himalayan foothills, Jharkhand, Chhattisgarh
• Key species: Teak (most dominant), Sal, Shisham, Sandalwood, Bamboo

Dry Deciduous (70-100 cm): Longer dry season; open, scattered growth

• Location: Peninsular plateau, UP plains
• Key species: Teak, Sal, Peepal, Neem, Palash (Flame of Forest), Tendu

Tropical Thorn Forests and Scrubs (<70 cm)

• Plants adapted to conserve water: long roots, thick bark, waxy/thorny leaves
• Location: Rajasthan, Gujarat, SW Haryana, semi-arid zones of MP, UP
• Key species: Babool (Acacia), Ber, Wild date palm, Khejri (state tree of Rajasthan), Cacti

Montane Forests (Altitudinal Zonation)

Southern montane forests (Nilgiris, Palani, Anaimalai): Shola forests — stunted evergreen in valleys.

Mangrove/Littoral Forests

• Total mangrove area: ~6,740 sq km (~7% of world's mangroves)
• Sundarbans: World's largest mangrove forest; Royal Bengal Tiger; Sundari tree (~70%)
• Other locations: Bhitarkanika (Odisha), Pichavaram (TN), Gulf of Kutch, A&N Islands
• Adaptations: Pneumatophores (breathing roots), Viviparous germination (seeds germinate on tree)

Biosphere Reserves of India (18 total, 12 in UNESCO)

Wildlife Protection

• Wildlife Protection Act: 1972
• Project Tiger: 1973 (Jim Corbett NP — first tiger reserve)
• Project Elephant: 1992
• National parks: 106; Wildlife sanctuaries: 567
• Nilgiri: India's first Biosphere Reserve (1986)

Endangered Species

AP Connection

• Seshachalam Biosphere Reserve (2010): Only biosphere reserve in AP; home to Red Sanders (Pterocarpus santalinus), endemic and extremely valuable
• Nallamala Hills: Nagarjunsagar-Srisailam Tiger Reserve — India's largest tiger reserve
• Coringa Mangrove Forest: 2nd largest mangrove in India, near Kakinada
• Sri Venkateswara National Park: Seshachalam Hills, Tirupati
• Papikondalu: Riverine forests along Godavari gorge
• Eastern Ghats in AP: predominantly dry deciduous forests
• Forest cover: ~23% of AP's total area

Key Points Summary

1. India is one of 12 mega-biodiversity countries with ~47,000 plant species
2. Tropical Deciduous forests are the most widespread in India
3. Rainfall gradient: Evergreen (>200) > Moist Deciduous (100-200) > Dry Deciduous (70-100) > Thorn (<70)
4. Teak is the most dominant species in moist deciduous forests
5. Mangroves = Sundarbans = Sundari tree = pneumatophores = viviparous germination
6. Sundarbans is the world's largest mangrove forest
7. Nilgiri = first biosphere reserve (1986); India has 18 total
8. Seshachalam = only biosphere reserve in AP (2010)
9. Wildlife Protection Act 1972; Project Tiger 1973; Project Elephant 1992
10. India has 106 national parks and 567 wildlife sanctuaries
11. Asiatic Lion: only in Gir, Gujarat; One-horned Rhino: Kaziranga, Assam
12. Montane forests show altitudinal zonation from temperate to tundra
13. Shola forests are unique to southern hill ranges (Nilgiris)
14. Forest area target: 33% of geographical area (actual ~21%)
15. Red Sanders is endemic to Seshachalam Hills, AP

Exam Strategy

• Rainfall-vegetation correlation is the most tested concept — memorize the exact rainfall ranges
• Species-forest matching: Teak/Sal = Deciduous; Rosewood/Mahogany = Evergreen; Babool = Thorn
• Biosphere reserves: Know the first (Nilgiri), the AP one (Seshachalam), and total count (18)
• AP-specific: Coringa mangroves, Seshachalam, Nallamala Tiger Reserve, Red Sanders
• Trick: Deciduous forests are most WIDESPREAD; Evergreen get most RAINFALL

Key Terms Glossary