15.7 Ecosystems of Pakistan

Pakistan is a country of remarkable ecological diversity. Its ecosystems range from coastal mangroves at sea level to alpine meadows above 4,000 m, shaped by dramatic variations in altitude, latitude, temperature, and precipitation.

Factors Determining Ecosystem Diversity

The primary factors that create Pakistan's diverse ecosystems are:

• Altitude: Ranges from sea level (Arabian Sea coast) to 8,611 m (K2)
• Latitude: From tropical south to temperate north
• Precipitation: From hyper-arid deserts (<100 mm/year) to monsoon-fed forests (>1,500 mm/year)
• Temperature: From extreme heat in Sindh to sub-zero winters in Gilgit-Baltistan

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Major Ecosystems of Pakistan

1. Alpine Meadows

• Location: Above the tree line in Gilgit-Baltistan and KPK (above ~3,500 m)
• Vegetation: Low-growing perennial grasses, sedges, and wildflowers such as Primula and Saxifraga
• Adaptations: Plants have short growing seasons and are adapted to extreme cold and UV radiation
• Fauna: Snow Leopard (Panthera uncia), Marco Polo Sheep, Ibex, Golden Eagle

2. Temperate Coniferous Forests

• Location: Northern Pakistan — Kaghan, Swat, Murree, Chitral (1,500–3,500 m)
• Vegetation: Dominated by evergreen trees with needle-like leaves:
  • Deodar Cedar (Cedrus deodara) — Pakistan's national tree
  • Blue Pine (Pinus wallichiana)
  • Silver Fir (Abies pindrow)
• Adaptations: Conical shape and needle leaves shed snow; waxy cuticle reduces water loss
• Fauna: Musk Deer, Black Bear, Pheasants

3. Sub-tropical Scrub Forests

• Location: Foothills of Punjab and KPK (Pothohar Plateau, Salt Range)
• Vegetation: Phulai (Acacia modesta), Olive (Olea cuspidata), Sanatha
• Characteristics: Drought-resistant shrubs and small trees; open canopy

4. Tropical Thorn Forests

• Location: Plains of Punjab and Sindh
• Vegetation: Thorny trees and shrubs such as Acacia nilotica (Kikar) and Prosopis cineraria (Jand)
• Characteristics: Adapted to hot, dry conditions with sparse rainfall

5. Indus River Plain (Riverine Ecosystem)

• Location: Along the Indus River and its tributaries across Punjab and Sindh
• Characteristics:
  • Alluvial, fertile soil deposited by river flooding
  • Historically supported tropical thorn forests
  • Now dominated by irrigation-based agriculture (wheat, rice, cotton)
• Fauna: Indus River Dolphin (Platanista gangetica minor), diverse waterfowl, Mugger Crocodile

6. Desert Ecosystems

Pakistan has four major desert ecosystems:

• Vegetation: Drought-tolerant plants — Calligonum, Haloxylon (Saxaul), Tamarix
• Fauna: Chinkara Gazelle, Desert Fox, Sand Grouse, various reptiles
• Adaptations: Nocturnal behavior, water conservation, deep root systems

7. Mangrove Ecosystem

• Location: Indus Delta (Sindh) and Makran Coast (Balochistan)
• Dominant species: Avicennia marina (Grey Mangrove)
• Characteristics:
  • Salt-tolerant (halophytic) trees growing in tidal zones
  • Prop roots (pneumatophores) for gas exchange in waterlogged soil
  • Pakistan has one of the world's largest mangrove forests
• Ecological importance:
  • Nursery and breeding grounds for fish, shrimp, and crabs
  • Coastline protection from erosion and storms
  • Carbon sequestration
• Fauna: Flamingos, Herons, Marine turtles, Dolphins

8. Wetlands and Lakes

• Examples: Keenjhar Lake, Haleji Lake, Manchhar Lake (Sindh); Uchhali Complex (Punjab)
• Importance: Critical stopover points for migratory birds on the Central Asian Flyway
• Fauna: Siberian Crane, Flamingo, various ducks and waders

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Summary Table