Eastern Himalayan broadleaf forests

Eastern Himalayan broadleaf forests
Eastern Himalayan broadleaf forests
	Broadleaf forests in Jigme Dorji National Park, Bhutan
	Ecoregion territory (in purple)
Ecology
Realm	Indomalayan
Biome	temperate broadleaf and mixed forests
Borders	List Eastern Himalayan subalpine conifer forests ; Northeastern Himalayan subalpine conifer forests ; Northern Triangle temperate forests ; Mizoram–Manipur–Kachin rain forests ; Northeast India–Myanmar pine forests ; Brahmaputra Valley semi-evergreen forests ; Himalayan subtropical broadleaf forests ; Himalayan subtropical pine forests ;
Bird species	490
Mammal species	183
Geography
Area	83,100 km2 (32,100 sq mi)
Countries	List Bhutan ; India ; Nepal ; Myanmar ; China ;
Conservation
Habitat loss	20.809%
Protected	8.97%

Last updated November 17, 2024

The Eastern Himalayan broadleaf forests is a temperate broadleaf forest ecoregion found in the middle elevations of the eastern Himalayas, including parts of Nepal, India, Bhutan, Myanmar and China. These forests have an outstanding richness of wildlife.

Setting

This ecoregion covers an area of 83,100 km² (32,100 sq mi) and constitutes a band of temperate broadleaf forests lying on steep mountain slopes of the Himalayas between approximately 2,000 and 3,000 m (6,600 and 9,800 ft). It extends from the Kali Gandaki River in Nepal across Sikkim and West Bengal in India, Bhutan, the Indian state of Arunachal Pradesh and neighboring Myanmar.^{[ citation needed ]} China's Chayu Nature Reserve also has a very small part of this ecoregion. ^[2]

The temperate broadleaf forests transition into the Himalayan subtropical pine forests and the Himalayan subtropical broadleaf forests at lower elevations, and into the Eastern Himalayan subalpine conifer forests at higher elevations. This area receives over 2000 mm of rainfall per year, mostly falling from May to September during the monsoon.^{[ citation needed ]}

Flora

The Eastern Himalayan broadleaf forests are diverse and species-rich, with a great diversity (of oaks and rhododendrons in particular) and many endemic species including plants of Indomalayan, Indochinese, Himalayan, Eastern Asiatic and even Gondwanan origin.

The ecoregion has two broad forest types: evergreen and deciduous. In both types of forests, the dominant trees are Pinus roxburghii , Pinus hwangshanensis , Juniperus tibetica , Shorea robusta , Olea europaea subsp. cuspidata , and Taxus sumatrana . Evergreen forests are characterized by oaks (Quercus spp.), chiefly Quercus lamellosa, together with Lithocarpus pachyphylla, Rhododendron arboreum, Rhododendron falconeri, Rhododendron thomsonii, Magnolia doltsopa, Magnolia cathcartii, Exbucklandia populnea, Symplocos cochinchinensis, Taiwania cryptomerioides, Magnolia spp., Cinnamomum spp., and Machilus spp. The many rhododendron species include more than fifty in Sikkim and another sixty in Bhutan.

In the deciduous forests meanwhile the predominant tree species are Himalayan maple ( Acer campbellii ), Juglans regia , Alnus nepalensis , Betula alnoides , Betula utilis , Larix griffithii , Tsuga dumosa , Picea brachytyla , and Echinocarpus dasycarpus .

Finally in Eastern Nepal there are wetter areas dominated by a mixture of Magnolia campbellii , Acer campbellii and Osmanthus suavis along with Himalayan hazel ( Corylus ferox ).

Fauna

The forests are home to over 500 species of bird some of which migrate to the higher Himalayas in the hot summer. There are twelve near-endemic bird species as well as the strictly endemic rufous-throated wren-babbler. A number of bird species especially pheasant, tragopan and hornbill are easily threatened by changes to their habitat and those found here include the globally threatened rufous-necked hornbill (Aceros nipalensis), Sclater's monal (Lophophorus sclateri), white-bellied heron (Ardea insignis), Blyth's tragopan (Tragopan blythii) and Ward's trogon (Harpactes wardi).

There are four endemic or near-endemic mammals including Gee's golden langur ( Trachypithecus geei ) which is found north of the Brahmaputra River between the Sankosh and Manas Rivers. Other endemic mammals are Hodgson's giant flying squirrel ( Petaurista magnificus ), Namdapha flying squirrel ( Biswamoyopterus biswasi ) and Brahma white-bellied rat ( Niviventer brahma ), while endangered species found here include a population of Bengal tigers adapted to higher mountain slopes and having a high conservation priority. Other endangered species include takin (Budorcas taxicolor) and Himalayan serow (a subspecies of Capricornis sumatraensis) as well as the vulnerable Mandelli's mouse-eared bat ( Myotis sicarius ), Assam macaque (Macaca assamensis), stump-tailed macaque (Macaca arctoides), dhole (Cuon alpinus), back-striped weasel (Mustela strigidorsa), clouded leopard (Neofelis nebulosa), and Irrawaddy squirrel (Callosciurus pygerythrus). The area also includes patches of fir forest with a bamboo undergrowth that are home to the endangered red panda (Ailurus fulgens).

Conservation

Most of the forest is intact as these are steep inaccessible slopes, although the Quercus lanata forests of the lower elevations are vulnerable to clearance, while the upper slopes are liable to be used for livestock grazing, especially in more densely populated Nepal. Protected areas include Namdapha National Park and Mehao Wildlife Sanctuary in Arunachal Pradesh, Makalu Barun National Park in Nepal, and parts of Thrumshingla, Jigme Dorji, and Jigme Singye Wangchuck National Parks and Kulong Chu Wildlife Sanctuary in Bhutan. There are plans to create corridors of protection linking some of these areas in Bhutan and in India. The area around Namdapha National Park has been increasingly settled by Chakma refugees from Bangladesh. Another threat is the plan to build a dam on the Dihing River.^[3] One area of importance that is currently unprotected is Mount Phulchowki in the Kathmandu valley.

Protected areas

In 1997, 15 protected areas were identified in this ecoregion, with a combined area of approximately 5,800 km² (2,200 sq mi) that includes 7% of the ecoregion's area:^[4]

Eaglenest Wildlife Sanctuary, Arunachal Pradesh (also extends into the Himalayan subtropical pine forests) (120 km² (46 sq mi))
Mouling National Park, Arunachal Pradesh (also extends into the Himalayan subtropical pine forests) (200 km² (77 sq mi))
Mehao Wildlife Sanctuary, Arunachal Pradesh (also extends into the Himalayan subtropical pine forests and Brahmaputra Valley semi-evergreen forests) ((110 km² (42 sq mi))
Royal Manas National Park, Bhutan (also extends into the Himalayan subtropical broadleaf forests) (410 km² (160 sq mi))
Shivapuri Nagarjun National Park, Nepal (159 km² (61 sq mi))^[5]
Makalu-Barun National Park, Nepal (1,500 km² (580 sq mi));^[5] also extends into the Eastern Himalayan subalpine conifer forests and Eastern Himalayan alpine shrub and meadows
Neora Valley National Park, West Bengal (88 km² (34 sq mi))^[6]
Torsa Strict Nature Reserve, Bhutan (651 km² (251 sq mi));^[6] also extends into the Eastern Himalayan subalpine conifer forests and Eastern Himalayan alpine shrub and meadows
Jigme Dorji National Park, Bhutan (also extends into the Eastern Himalayan subalpine conifer forests and Eastern Himalayan alpine shrub and meadows) (560 km² (220 sq mi))
Thrumshingla National Park, Bhutan (also extends into the Eastern Himalayan alpine shrub and meadows) (310 km² (120 sq mi))
Bumdeling Wildlife Sanctuary, Bhutan (also extends into the Eastern Himalayan subalpine conifer forests) (390 km² (150 sq mi))
Jigme Singye Wangchuck National Park, Bhutan (also extends into the Eastern Himalayan subalpine conifer forests and Eastern Himalayan alpine shrub and meadows) (600 km² (230 sq mi))
Namdapha National Park, Arunachal Pradesh (1,580 km² (610 sq mi))
Kamlang Wildlife Sanctuary, Arunachal Pradesh (780 km² (300 sq mi))
Chayu Nature Reserve, Tibet (also extends into the Eastern Himalayan subalpine conifer forests) (320 km² (120 sq mi))

Related Research Articles

Singalila National Park is a national park of India located on the Singalila Ridge at an elevation of more than 2,300 metres above sea level, in the Darjeeling district of West Bengal. It is well known for the trekking route to Sandakphu that runs through it.

Neora Valley National Park is a national park in Kalimpong district, West Bengal, India that was established in 1986. Spread over an area of 88 km² (34 sq mi), it is a rich biological zone in eastern India. It is the land of the red panda in the pristine undisturbed natural habitat with rugged inaccessible hilly terrain and rich diverse flora and fauna. It is linked to Pangolakha Wildlife Sanctuary of Pakyong District as well as forests of Samtse District, Bhutan via thick cover of forests.

The Upper Gangetic Plains moist deciduous forests is a tropical and subtropical moist broadleaf forests ecoregion of northern India.

The Brahmaputra Valley semi-evergreen forests is a tropical moist broadleaf forest ecoregion of Northeastern India, southern Bhutan and adjacent Bangladesh.

Namdapha National Park is a 1,985 km² (766 sq mi) large national park in Arunachal Pradesh of Northeast India. The park was established in 1983. With more than 1,000 floral and about 1,400 faunal species, it is a biodiversity hotspot in the Eastern Himalayas. It harbours the northernmost lowland evergreen rainforests in the world at 27°N latitude. It also harbours extensive dipterocarp forests, comprising the northwestern parts of the Mizoram-Manipur-Kachin rain forests ecoregion.

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 Western Himalayan alpine shrub and meadows is a montane grasslands and shrublands ecoregion of Nepal, India, and Tibet, which lies between the tree line and snow line in the western portion of the Himalaya Range.

The Eastern Himalayan alpine shrub and meadows is a montane grasslands and shrublands ecoregion of Bhutan, China, India, Myanmar, and Nepal, which lies between the tree line and snow line in the eastern portion of the Himalaya Range.

The Northern Triangle temperate forests is a temperate broadleaf and mixed forest ecoregion of thick forest covering the mountains of northern Myanmar.

The Western Himalayan broadleaf forests is a temperate broadleaf and mixed forest ecoregion which is found in the middle elevations of the western Himalayas, including parts of Nepal, India, and Pakistan.

<span class="mw-page-title-main">Eastern Himalayan subalpine conifer forests</span>

The Eastern Himalayan subalpine conifer forests is a temperate coniferous forests ecoregion which is found in the middle and upper elevations of the eastern Middle Himalayas, in western Nepal, Bhutan, northern Indian states including Arunachal Pradesh and Sikkim and adjacent Myanmar and China.

The Northeastern Himalayan subalpine conifer forests are a temperate coniferous forests ecoregion of the middle to upper elevations of the eastern Himalayas and southeast Tibetan Plateau. The ecoregion occurs in southeastern Tibet Autonomous Region, China, in northern and eastern Arunachal Pradesh, India, and extreme eastern Bhutan.

The Western Himalayan subalpine conifer forests is a temperate coniferous forests ecoregion of the middle and upper elevations of the western Middle Himalayas of Nepal, India, and Pakistan.

Jigme Singye Wangchuck National Park covers an area of 1,730 square kilometres (670 sq mi) in central Bhutan. It protects a large area of the Black Mountains, a sub−range of the Himalayan Range System.

The ecology of the Himalayas varies with climate, rainfall, altitude, and soils. The climate ranges from tropical at the base of the mountains to permanent ice and snow at the highest elevations. The amount of yearly rainfall increases from west to east along the southern front of the range. This diversity of climate, altitude, rainfall and soil conditions supports a variety of distinct plant and animal species, such as the Nepal gray langur

The Sacred Himalayan Landscape is a 39,021 km² (15,066 sq mi) large trans-boundary landscape in the eastern Himalayas encompassing temperate broadleaf and conifer forests, alpine meadows and grasslands, which harbour more than 80 mammal and more than 440 bird species. It extends from Nepal's Langtang National Park through Sikkim and Darjeeling in India to western Bhutan's Torsa Strict Nature Reserve. More than 73% of this landscape is located in Nepal, including Sagarmatha National Park, Makalu Barun National Park, and Kanchenjunga Conservation Area. About 24% is located in India, encompassing Khangchendzonga, Singalila and Neora Valley National Parks as well as Fambong Lho, Maenam, Senchal, Mahananda Wildlife Sanctuaries, Shingba and Barsey Rhododendron Sanctuaries and Kyongnosla Alpine Sanctuary.

Fambong Lho Wildlife Sanctuary is a 51 km² (20 sq mi) large wildlife sanctuary in Gangtok district of the state of Sikkim in India. It is contiguous with Khangchendzonga National Park and located around 30 km (19 mi) west of Gangtok. It hosts a few small hamlets inside, namely Dikchu, Pangthang, and Mangan and is managed by State Forest Department.

Naina Devi Himalayan Bird Conservation Reserve is a wildlife reserve in the Nainital district of the state of Uttarakhand in India. This reserve forest is located in Kumaon region of Uttarakhand and placed inside Nainital forest division. Nainital forest division at present has several birding trails and forest patches consisting of temperate broad-leaf forests to alpine grasslands to rhododendron shrubberies. Wide altitudinal variation supports a very large segment of avian fauna to inhibit in this forest range.

Arunachal Pradesh is primarily a hilly tract nestled in the foothills of the Himalayas in northeast India. It is spread over an area of 83,743 km² (32,333 sq mi). 98% of the geographical area is land out of which 80% is forest cover; 2% is water. River systems in the region, including those from the higher Himalayas and Patkoi and Arakan Ranges, eventually drain into the Brahmaputra River.

<span class="mw-page-title-main">Outline of Arunachal Pradesh</span> State in NE India

The following outline is provided as an overview of and topical guide to Arunachal Pradesh:

References

1 2 3 4 Hoekstra, J. M.; Molnar, J. L.; Jennings, M.; Revenga, C.; Spalding, M. D.; Boucher, T. M.; Robertson, J. C.; Heibel, T. J.; Ellison, K. (2010). Molnar, J. L. (ed.). The Atlas of Global Conservation: Changes, Challenges, and Opportunities to Make a Difference . University of California Press. ISBN 978-0-520-26256-0.
↑ Wikramanayake, E.; Dinerstein, E. & Loucks, C. J. (2002). "26. Eastern Himalayan broadleaf forests". Terrestrial Ecoregions of the Indo-Pacific: a Conservation Assessment. Washington, DC: Island Press. pp. 335–338.
↑ "Eastern Himalayan broadleaf forests". Terrestrial Ecoregions. World Wildlife Fund.
↑ Wikramanayake, E.; Dinerstein, E. & Loucks, C. J. (2002). "26. Eastern Himalayan broadleaf forests". Terrestrial Ecoregions of the Indo-Pacific: a Conservation Assessment. Washington, DC: Island Press. pp. 335–338.
1 2 Bhuju, U. R., Shakya, P. R., Basnet, T. B., Shrestha, S. (2007). Nepal Biodiversity Resource Book. Protected Areas, Ramsar Sites, and World Heritage Sites. International Centre for Integrated Mountain Development, Ministry of Environment, Science and Technology, in cooperation with United Nations Environment Programme, Regional Office for Asia and the Pacific. Kathmandu, ISBN 978-92-9115-033-5
1 2 Shakya, B., Joshi, R. M. (2008). Protected Areas and Biodiversity Conservation in the Hindu Kush-Himalayan Region with Special Reference to the Kangchenjunga Landscape. In: N. Chettri, B. Shakya, E. Sharma (eds.) Biodiversity Conservation in the Kangchenjunga Landscape. International Centre for Integrated Mountain Development, Kathmandu. Pp. 13–20.

External links

WWF: Map of ecoregions in Nepal, showing the Eastern Himalayan broadleaf forests

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[Atlas-1] 1 2 3 4 Hoekstra, J. M.; Molnar, J. L.; Jennings, M.; Revenga, C.; Spalding, M. D.; Boucher, T. M.; Robertson, J. C.; Heibel, T. J.; Ellison, K. (2010). Molnar, J. L. (ed.). The Atlas of Global Conservation: Changes, Challenges, and Opportunities to Make a Difference . University of California Press. ISBN 978-0-520-26256-0.

[2] Wikramanayake, E.; Dinerstein, E. & Loucks, C. J. (2002). "26. Eastern Himalayan broadleaf forests". Terrestrial Ecoregions of the Indo-Pacific: a Conservation Assessment. Washington, DC: Island Press. pp. 335–338.

[3] "Eastern Himalayan broadleaf forests". Terrestrial Ecoregions. World Wildlife Fund.

[4] Wikramanayake, E.; Dinerstein, E. & Loucks, C. J. (2002). "26. Eastern Himalayan broadleaf forests". Terrestrial Ecoregions of the Indo-Pacific: a Conservation Assessment. Washington, DC: Island Press. pp. 335–338.

[nbrb07-5] 1 2 Bhuju, U. R., Shakya, P. R., Basnet, T. B., Shrestha, S. (2007). Nepal Biodiversity Resource Book. Protected Areas, Ramsar Sites, and World Heritage Sites. International Centre for Integrated Mountain Development, Ministry of Environment, Science and Technology, in cooperation with United Nations Environment Programme, Regional Office for Asia and the Pacific. Kathmandu, ISBN 978-92-9115-033-5

[Shakya2008-6] 1 2 Shakya, B., Joshi, R. M. (2008). Protected Areas and Biodiversity Conservation in the Hindu Kush-Himalayan Region with Special Reference to the Kangchenjunga Landscape. In: N. Chettri, B. Shakya, E. Sharma (eds.) Biodiversity Conservation in the Kangchenjunga Landscape. International Centre for Integrated Mountain Development, Kathmandu. Pp. 13–20.

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