Deccan Plateau dry deciduous forests

Deccan Plateau dry deciduous forests
Name	Deccan Plateau dry deciduous forests
Biome	Tropical and subtropical dry broadleaf forests
Countries	India
Area km2	200000
Conservation	Vulnerable

Deccan Plateau dry deciduous forests are a tropical dry broadleaf forest ecoregion on the Deccan Plateau of peninsular India, characterized by seasonally deciduous trees, extensive hardpan soils, and a long human history of agriculture and pastoralism. The ecoregion spans parts of several Indian states and interfaces with adjacent ecoregions such as the Eastern Ghats, Western Ghats, and the Godavari River and Krishna River basins, supporting a mosaic of woodland, scrub, and grassland that sustains diverse wildlife and numerous cultural landscapes.

Geography and extent

The ecoregion occupies central and southern portions of the Deccan Plateau across the states of Maharashtra, Karnataka, Telangana, Andhra Pradesh, and Chhattisgarh, bounded by the Satpura Range to the north and the Western Ghats and Eastern Ghats to the west and east respectively. Major rivers crossing the region include the Godavari River, Krishna River, and Tungabhadra River, while cities such as Hyderabad, Pune, Nagpur, Bengaluru, and Vijayawada lie near or within its periphery. Geologic substrates range from Deccan Traps basalt flows to peninsular gneiss and schist, producing a patchwork of lateritic and red loam soils and isolated plateaus like the Chitradurga district mesas and the Nallamala Hills uplands.

Climate and ecoregion classification

The climate is marked by a tropical seasonal regime with a pronounced dry season and a monsoon period dominated by the Southwest Monsoon, influenced by the Intertropical Convergence Zone and the Bay of Bengal moisture pathways. Annual rainfall varies from approximately 600 to 1200 mm depending on elevation and rain shadow effects from the Western Ghats and Eastern Ghats, while mean temperatures reflect tropical savanna conditions similar to those described in Köppen climate classification maps used by conservation organizations such as the World Wide Fund for Nature and the International Union for Conservation of Nature for ecoregion delineation. The area is classified within the WWF biome of Tropical and subtropical dry broadleaf forests and is contiguous with the Deccan thorn scrub forests and Central Deccan Plateau dry deciduous forests transitions.

Flora and vegetation communities

Vegetation is dominated by seasonally deciduous canopy species including Teak (Tectona grandis), Pterocarpus marsupium (Indian kino tree), Anogeissus latifolia, Terminalia tomentosa, and Terminalia bellirica, with an understory of Zizyphus mauritiana, Lagerstroemia parviflora, and thorny species. Grassland pockets host species comparable to those in Vindhya and Satpura landscapes, supporting C4 grasses and fire-adapted taxa; hilltop scrub and rocky outcrops contain endemic assemblages similar to those on the Eastern Ghats and Aravalli Range. The ecoregion exhibits successional dynamics where logged or grazed areas revert to Lantana camara invasion or degraded scrub found around expanding agricultural frontiers and near towns such as Solapur and Bellary.

Fauna and wildlife

Large mammals recorded historically and presently include Indian elephants that migrate along corridors linked to the Nagarjunsagar-Srisailam and Kaziranga-style landscapes, tigers in fragmented populations near reserves like Tadoba, dhole packs, and herbivores such as sambar deer, chital, and nilgai. Leopard populations persist in proximity to urban centers such as Hyderabad and Bengaluru, while smaller carnivores include Indian wolf and jackal taxa documented in peninsular records. Avifauna includes species overlapping with Deccan and peninsular flyways—Indian peafowl, grey partridge, and raptors like the crested serpent eagle—and herpetofauna comprises endemic and range-restricted reptiles and amphibians described in surveys by institutions such as the Bombay Natural History Society and Zoological Survey of India.

Human populations and land use

The plateau hosts dense human populations associated with historical polities of the Mughal Empire peripheries and successive regional states such as the Maratha Empire and the Vijayanagara Empire, and modern metropolises including Pune and Bengaluru. Land use is dominated by rainfed and irrigated agriculture (rice, millet, cotton, sorghum), plantation crops like teak and eucalyptus introduced by forestry departments, and pastoralism by pastoral communities linked to markets in Mumbai and Chennai. Infrastructure corridors—railways established during the British Raj, national highways such as National Highway 44, and expanding urban agglomerations—have fragmented habitats and altered traditional commons and watershed practices formerly managed under institutions like princely state administrations and local panchayats.

Conservation status and threats

The ecoregion is considered vulnerable due to widespread deforestation for agriculture, fuelwood extraction, mining for iron ore and limestone near districts like Bellary and Chitradurga, invasive species proliferation, frequent fires, and hydrological modifications by dams on tributaries of the Godavari and Krishna. Threats are compounded by industrial expansion, relocation projects tied to policies enacted after Independence of India, and climate change projections that affect monsoon reliability as studied by agencies including the Indian Meteorological Department and international research centers. Conservation assessments by the IUCN and regional NGOs highlight fragmentation metrics and call for integrated landscape approaches linking protected areas to community-managed reserves.

Protected areas and management strategies

Protected areas within the ecoregion include national parks and wildlife sanctuaries such as Tadoba Andhari Tiger Reserve, Nagarjunsagar-Srisailam (boundary interface), and smaller sanctuaries managed by state forest departments of Maharashtra, Karnataka, and Telangana. Management strategies combine anti-poaching units, community forestry models linked to Joint Forest Management policies, restoration plantings using native taxa promoted by botanical gardens like the Sanjay Gandhi National Park research units, and corridor planning influenced by conservation NGOs and international donors including projects funded under multilateral frameworks like the Global Environment Facility. Effective conservation emphasizes connectivity with the Western Ghats biodiversity hotspots, participatory governance with gram panchayats, sustainable livelihood alternatives linked to agroforestry schemes, and landscape-scale monitoring by institutions such as the Wildlife Institute of India and academic departments at University of Pune and University of Hyderabad.

Category:Ecoregions of India