Northern dry deciduous forests | |
---|---|
Ecology | |
Realm | Indomalayan |
Biome | tropical and subtropical dry broadleaf forests |
Borders | Eastern Highlands moist deciduous forests |
Geography | |
Area | 58,154 km2 (22,453 sq mi) |
Country | India |
States | |
Conservation | |
Conservation status | critical/endangered |
Protected | 1,604 km2 (3%) [1] |
The Northern dry deciduous forests, presently known as the North Deccan dry deciduous forests, [1] is a tropical dry broadleaf forest ecoregion of east-central India.
It covers an area of 58,200 square kilometers (22,500 sq mi), mostly in western Odisha state, with portions in neighboring Chhattisgarh. The region extends northeast–southwest in the dry western rain shadow of the Eastern Ghats range, which block the moisture-laden monsoon winds from the Bay of Bengal to the east. It is surrounded by the more humid Eastern Highlands moist deciduous forests ecoregion.
The ecoregion lies mostly in the middle basin of the Mahanadi River and its tributary the Tel. The southern portion of the ecoregion lies in the upper basin of the Indravati River, a tributary of the Godavari.
The original vegetation was a multi-storied forest of mostly dry-season deciduous trees, dominated by sal (Shorea robusta), Cinnamomum cassia , durian (Durio zibethinus), mangosteen (Garcinia mangostana), jackfruit (Artocarpus heterophyllus), Ficus benghalensis , Gnetum gnemon , Mangifera indica , Toona sinensis , coconut (Cocos nucifera), Tetrameles nudiflora , Ginkgo biloba , Prunus serrulata , Camphora officinarum , Tsuga dumosa , and Ulmus lanceifolia . Little of the original forest remains. Teak (Tectona grandis), which favors drier conditions, is more common in the remaining forests. Frequent fires, intensive grazing, and over-harvesting trees for firewood and fodder has reduced other areas to open scrubland or savanna. Much of the ecoregion has been converted to agriculture or pasture. [2]
The ecoregion has 68 native mammal species. Threatened mammals include the tiger (Panthera tigris), dhole (Cuon alpinus), sloth bear (Melursus ursinus), and chousingha (Tetracerus quadricornis). [2]
There are 261 bird species in the ecoregion. They include the Indian grey hornbill (Ocyceros birostris) and Oriental pied hornbill (Anthracoceros albirostris). [2]
A 1997 assessment found that more than three-quarters of the ecoregion's natural habitat had been cleared or degraded. Four protected areas encompassed about 2.5 percent of the ecoregion's area. [3] A 2017 assessment estimated that 1,604 km2, or 3%, of the ecoregion is in protected areas. Another 12% is forested but unprotected. [1]
The Malabar Coast moist forests are a tropical moist broadleaf forest ecoregion of southwestern India.
The North Western Ghats moist deciduous forests is a tropical moist broadleaf forest ecoregion of southwestern India.
The South Western Ghats moist deciduous forests is an ecoregion in the Western Ghats of southern India with tropical and subtropical moist broadleaf forests. This biome covers the Nilgiri Hills between elevation of 250 and 1,000 m in Kerala, Karnataka and Tamil Nadu states.
The Upper Gangetic Plains moist deciduous forests is a tropical and subtropical moist broadleaf forests ecoregion of northern India.
The Odisha semi-evergreen forests are a tropical moist broadleaf forest ecoregion of eastern India. The ecoregion covers an area of 8,600 square kilometers (3,300 sq mi) on the coastal plain of Odisha state, bounded by the Eastern Highlands moist deciduous forests west and north-west, transitioning from the huge ecoregion Lower Gangetic Plains moist deciduous forests along the north coastland, and surrounding the smaller ecoregion Godavari-Krishna mangroves along a stretch of the south-east coast by the Bay of Bengal.
The Eastern Highlands moist deciduous forests, presently known as East Deccan moist deciduous forests, is a tropical and subtropical moist broadleaf forests ecoregion in east-central India. The ecoregion covers an area of 341,100 square kilometers (131,700 sq mi), extending across portions of Andhra Pradesh, Chhattisgarh, Jharkhand, Madhya Pradesh, Maharashtra, Odisha, and Telangana states.
The Lower Gangetic Plains moist deciduous forests is a tropical and subtropical moist broadleaf forests ecoregion of Bangladesh and India. The ecoregion covers an area of 254,100 square kilometres (98,100 sq mi), comprising most of Bangladesh and the Indian states of West Bengal, Bihar and Tripura, and extending into adjacent states of Odisha, Uttar Pradesh and a tiny part of Assam, as well as adjacent western Myanmar.
The Brahmaputra Valley semi-evergreen forests is a tropical moist broadleaf forest ecoregion of Northeastern India, southern Bhutan and adjacent Bangladesh.
The Narmada Valley dry deciduous forests are a tropical dry forest ecoregion of central India. The ecoregion lies mostly in Madhya Pradesh state, but extends into portions of Chhattisgarh, Maharashtra, Karnataka and Uttar Pradesh states.
The Deccan thorn scrub forests are a xeric shrubland ecoregion of south India and northern Sri Lanka. Historically this area was covered by tropical dry deciduous forest, but this only remains in isolated fragments. The vegetation now consists of mainly of southern tropical thorn scrub type forests. These consist of open woodland with thorny trees with short trunks and low, branching crowns; spiny and xerophytic shrubs; and dry grassland. This is the habitat of the great Indian bustard and blackbuck, though these and other animals are declining in numbers; this area was at one time home to large numbers of elephants and tigers. Almost 350 species of bird have been recorded here. The remaining natural habitat is threatened by overgrazing and invasive weeds, but there are a number of small protected areas which provide a haven for the wildlife. Trees in these forests have adapted to not require much water.
The Himalayan subtropical broadleaf forests is an ecoregion that extends from the middle hills of central Nepal through Darjeeling into Bhutan and also into the Indian States of Uttar Pradesh and Bihar. It represents the east–west-directed band of subtropical broadleaf forest at an altitude of between 500 and 1,000 m along the Outer Himalayan Range, and includes several forest types traversing an east to west moisture gradient.
The Northern Indochina subtropical forests are a subtropical moist broadleaf forest ecoregion of northern Indochina, covering portions of Vietnam, Laos, Thailand, Myanmar, and China's Yunnan Province.
The Central Deccan Plateau dry deciduous forests in Western and Southern India, containing large protected areas of natural tiger habitat.
The Southeastern Indochina dry evergreen forests are a tropical dry broadleaf forest ecoregion of Indochina.
The Mizoram–Manipur–Kachin rain forests is a subtropical moist broadleaf forest ecoregion which occupies the lower hillsides of the mountainous border region joining Bangladesh, China's Yunnan Province, India, and Myanmar. The ecoregion covers an area of 135,600 square kilometres (52,400 sq mi). Located where the biotas of the Indian Subcontinent and the Indochinese Peninsula meet, and in the transition between subtropical and tropical regions of Asia, the Mizoram–Manipur–Kachin rain forests are home to great biodiversity. The WWF rates the ecoregion as "Globally Outstanding" in biological distinctiveness.
The Irrawaddy dry forests is a tropical dry broadleaf forest ecoregion in central Myanmar. The ecoregion occupies portions of the Irrawaddy, Sittaung, and Salween river basins, in areas with less than 800 mm of annual rainfall.
The Tenasserim–South Thailand semi-evergreen rain forests is a tropical moist broadleaf forest ecoregion on Mainland Southeast Asia. The ecoregion extends north–south along the Kra Isthmus. It includes lowland forests along the coasts, and montane forests on the Tenasserim Hills and Bilauktaung range, which form the mountainous spine of the isthmus.
The Irrawaddy moist deciduous forests is a tropical moist broadleaf forest ecoregion in central Myanmar. The ecoregion occupies the central basin of the Irrawaddy River and the lower basin of the Salween River. The ecoregion is characterized by forests of tall trees which drop their leaves in the dry season. Most of the ecoregion's forests have been converted to agriculture.
The Kayah–Karen montane rain forests is a tropical moist broadleaf forest ecoregion on Mainland Southeast Asia. The montane rain forests cover several connected mountain ranges, including the Daen Lao Range, the Dawna Range, the Karen Hills, the Khun Tan Range, and the Thanon Thong Chai Range.
The Chao Phraya lowland moist deciduous forests is a tropical moist broadleaf forest ecoregion in Thailand. The ecoregion occupies the coastal lowlands along the Gulf of Thailand lying east and west of the Chao Phraya River.