Sri Lanka dry-zone forests

Sri Lanka dry-zone forests are the extensive tropical dry broadleaf woodlands occupying the lowland and intermediate elevations of north, east and central Sri Lanka. The ecoregion spans major administrative provinces including North Central Province, North Western Province, Uva Province, Eastern Province and parts of Northern Province, and forms a distinct ecological belt from the Ceylon interior to the Palk Strait. This mosaic of forests, savannas and scrubland plays a central role in the island’s biodiversity, hydrology and cultural landscapes such as the Ancient Irrigation Works of Sri Lanka and the Sinhala Kingdoms.

Geography and Climate

The ecoregion lies predominantly on the Anuradhapura District, Polonnaruwa District, Monaragala District and Ampara District plains and includes protected areas like Minneriya National Park, Kaudulla National Park, Wilpattu National Park and Gal Oya National Park. Influenced by the Northeast monsoon and the Southwest monsoon, the climate exhibits a pronounced dry season that affects riverine systems such as the Mahaweli River, Malvathu Oya and Kumana River. Soils derive from Precambrian charnockite and Miocene sediments of the Sri Lankan Shield and support vegetation adapted to seasonal drought and frequent fires associated with traditional land use in the Anuradhapura Kingdom and later polities like the Kingdom of Kandy peripheral interactions. The terrain includes flat plains, low mesas and isolated monadnocks such as Pidurutalagala’s forelands and coastal lagoons near Trincomalee and Puttalam.

Flora

Dominant vegetation consists of drought-tolerant trees and scrub including species from genera such as Manilkara, Diospyros, Albizia, Terminalia, Anacardium and Acacia. Canopy trees include Drypetes sepiaria and Tamarindus indica while understory and thorn scrub feature Flueggea leucopyrus, Zizyphus mauritiana and spiny species associated with the Euphorbiaceae and Combretaceae families. Evergreen gallery forests occur along the Mahaweli River corridors and host lianas, epiphytes and riparian species related to Ficus and Barringtonia. Palms such as Corypha umbraculifera and Borassus flabellifer appear in pockets, while grasses belonging to Andropogon, Cymbopogon and Heteropogon form the savanna matrix. Endemic taxa from Sri Lanka’s western Ghats connection include species formerly recorded by botanists such as George Henry Kendrick Thwaites and collectors associated with the Royal Botanic Gardens, Peradeniya; these genera link to regional floras studied alongside Joseph Dalton Hooker’s concepts. Fire-adapted and deciduous phenologies reflect seasonal shifts recorded in colonial surveys by H.C.P. Bell and later ecological assessments by the International Union for Conservation of Nature.

Fauna

The faunal assemblage supports large herbivores and carnivores including the island’s flagship Sri Lankan elephant population historically aggregated in herds around reservoirs like Minneriya Tank and Kaudulla Tank, and large felids such as the endemic subspecies Sri Lankan leopard. Ungulates include Sambar deer, Spotted deer (Axis axis), and the near-endemic Sri Lankan axis. Avifauna is rich with species including Sri Lanka junglefowl, Ceylon grey hornbill, migratory waders at Bundala National Park fringe wetlands, and raptors recorded in regional atlases by naturalists such as Salim Ali. Reptiles and amphibians include endemic snakes and frog species first described by herpetologists like Frank Wall and R.C. Wroughton, while invertebrate diversity features endemic butterflies and moths documented in collections associated with the Natural History Museum, London and local universities such as the University of Peradeniya.

Human History and Archaeology

The dry-zone landscape has been a cradle of ancient civilization, hosting urban centers and hydraulic engineering from the Anuradhapura Kingdom and Polonnaruwa Kingdom periods, including monumental reservoirs, canals and tanks like Parakrama Samudra. Archaeological sites such as Anuradhapura and Polonnaruwa contain stupas, irrigation remains and inscriptions tied to rulers like King Dutugemunu and King Parakramabahu I. Colonial encounters with the Portuguese Empire, Dutch East India Company and British Empire altered land tenure, plantation patterns and forest exploitation, documented in administrative records held by institutions such as the National Archives of Sri Lanka. Contemporary rural cultures include irrigation-dependent agrarian communities, traditional elephant keepers linked to the Temple of the Tooth festivities in Kandy and indigenous practices of the Vedda peoples in peripheral zones.

Conservation and Threats

Protected areas such as Wasgamuwa National Park and Somawathiya National Park aim to conserve biodiversity but face pressures from agricultural expansion, irrigation schemes like the Mahaweli Development Programme, and encroachment linked to population growth in districts such as Anuradhapura District and Trincomalee District. Threats include human–wildlife conflict involving Sri Lankan elephant crop raiding, poaching tied to illegal wildlife trade networks noted by Interpol, invasive plants and altered fire regimes aggravated during post-war resettlement after the Sri Lankan Civil War. Conservation initiatives involve national bodies such as the Department of Wildlife Conservation (Sri Lanka), international partners including the World Wildlife Fund and community-based programs run with universities like the University of Colombo and NGOs documented in reports by the United Nations Development Programme. Adaptive management, restoration of riparian corridors, mitigation measures for corridor connectivity with Yala National Park and policy integration with national planning remain priorities under frameworks influenced by global agreements such as the Convention on Biological Diversity.

Category:Ecoregions of Sri Lanka