Nujiang Lancang Gorge alpine conifer and mixed forests | |
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Ecology | |
Realm | Palearctic |
Biome | Temperate coniferous forests |
Borders | |
Geography | |
Area | 82,993 km2 (32,044 sq mi) |
Countries | |
Conservation | |
Conservation status | critical/endangered [1] |
Protected | 17.28% [2] |
The Nujiang Lancang Gorge alpine conifer and mixed forests are a temperate coniferous forests ecoregion in Southwest China and northeastern Myanmar. The forests cover mountains and valleys in the western Hengduan Mountains and because of the extreme topography and relative remoteness, remain one of the best preserved habitats in China. [3]
The Nujiang Lancang Gorge alpine conifer and mixed forests stretch from southern Qinghai and eastern Tibet Autonomous Region in the north to Yunnan Province in the south. Portions of the forests also extend into extreme western Sichuan (China) and eastern Kachin State (Myanmar). The primary physical features to support the Nujiang forests are the Nu (Salween) and Lancang (Mekong) River valleys from approximately 4,000 m (13,000 ft) elevation to 1,000 m (3,300 ft) elevation. The southern part of this ecoregion forms the core of the Three Parallel Rivers UNESCO World Heritage Site. [1] In addition to the mountain valleys, the Nujiang Lancang Gorge alpine conifer and mixed forests are found across parts of the Hengduan Mountains including, from west to east, the Taniantaweng Mountains, the Gaoligong Mountains, the Nu Mountains, and the Yun Range. [3] [4]
The mountains in this region of the Hengduan are steep and provide few opportunities for access between valleys and gorges. This has led to the isolated nature of these forests. Notable endangered and vulnerable species in the Nujiang Lancang Gorge alpine conifer and mixed forests include the Yunnan snub-nosed monkey (endemic to this ecoregion), and Gaoligong pika, and Notable trees in the Nujiang Lancang Gorge alpine conifer and mixed forests include Taiwania flousiana , Pinus roxburghii , Pinus hwangshanensis , Juniperus tibetica , Olea europaea subsp. cuspidata , Taxus sumatrana , Shorea robusta , Acer campbellii , Juglans regia , Alnus nepalensis , Betula alnoides , Betula utilis , Larix griffithii , Picea brachytyla , Cathaya argyrophylla , Cyathea spinulosa , Sassafras tzumu , Davidia involucrata , Metasequoia glyptostroboides , Glyptostrobus pensilis , Castanea mollissima , Quercus myrsinifolia , Quercus acuta , Machilus thunbergii , Tetracentron , Cercidiphyllum japonicum , Emmenopterys henryi , Eucommia ulmoides , Juglans regia , Larix gmelinii , Larix sibirica , Larix × czekanowskii , Betula dahurica , Betula pendula , Pinus koraiensis , Pinus sibirica , Pinus sylvestris , Picea obovata , Abies sibirica , Quercus acutissima , Quercus mongolica , Ginkgo biloba , Prunus serrulata , Prunus padus , Tilia amurensis , Salix babylonica , Acer palmatum , Populus tremula , Ulmus davidiana , Ulmus pumila , Pinus pumila , Haloxylon ammodendron , Elaeagnus angustifolia , Tamarix ramosissima , Prunus sibirica ,. [1]
Forests in this ecoregion have long been threatened by logging, though since the 1990s the intensity of logging has declined in China. In the Myanmar portion, however, logging is still uncontrolled. [1] Lower elevation sections of the Nujiang forests are threatened by hydroelectric projects harnessing the power of the wild rivers.
17.28% of the ecoregion is in protected areas. Protected areas in the ecoregion include Emawbum National Park, Hkakaborazi National Park, Lashihai Wetland, and Three Parallel Rivers of Yunnan Protected Areas. [2]
The Himalayan subtropical pine forests are a large subtropical coniferous forest ecoregion covering portions of Bhutan, India, Nepal, and Pakistan.
The Northeast India-Myanmar pine forests is a montane subtropical coniferous forest ecoregion in the mountains of Northeastern India and adjacent portions of Myanmar.
The Hengduan Mountains are a group of mountain ranges in southwest China that connect the southeast portions of the Tibetan Plateau with the Yunnan–Guizhou Plateau. The Hengduan Mountains are primarily large north-south mountain ranges that effectively separate lowlands in northern Myanmar from the lowlands of the Sichuan Basin. These ranges are characterized by significant vertical relief originating from the Indian subcontinent's collision with the Eurasian Plate, and further carved out by the major rivers draining the eastern Tibetan Plateau. These rivers, the Yangtze, Mekong, and Salween, are recognized today as the Three Parallel Rivers UNESCO World Heritage Site.
The Taiwan subtropical evergreen forests is an ecoregion that covers most of the island of Taiwan, with the exception of the southern tip of the island, which constitutes the South Taiwan monsoon rain forests ecoregion. The island's concentrated steep mountains host a range of forest types, from subtropical forests in the lowlands to temperate and alpine or montane forests.
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.
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 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.
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 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.
The Sichuan Basin evergreen broadleaf forests are a critically endangered WWF ecoregion. The ecoregion occupies the Sichuan Basin in China and covers an area of 9,816,054 ha. The broadleaf forest habitat once covered the Sichuan Basin, but today is limited to mountains and preserved temple grounds in the basin and around the basin's rim. An especially well-preserved example of remaining forest exists on Mount Emei at the western edge of the Sichuan Basin. The original forests are thought to have been made up of subtropical oaks, laurels, and Schima. Much of the remaining Sichuan Basin has been converted to anthropogenic agricultural use in the last 5,000 years.
The Qionglai-Minshan conifer forests are a World Wide Fund for Nature ecoregion in Southwest China. These forests are classified as temperate coniferous forests and are part of the Palearctic realm.
The Yunnan Plateau subtropical evergreen forests is an endangered ecoregion in southwestern China. These forests once covered the western parts of the Yungui Plateau but have been significantly reduced and replaced with agricultural land uses. The Yunnan evergreen forests and the neighbouring Guizhou Plateau broadleaf and mixed forests are the only two ecoregions in the Palearctic realm to be classified as part of tropical and subtropical moist broadleaf forests biome.
The Guizhou Plateau broadleaf and mixed forests are a subtropical moist broadleaf forest ecoregion in the Yungui Plateau of China. Much of the original forest has been replaced by secondary forests.
The Qilian Mountains Conifer Forests ecoregion is an ecoregion that consists of a series of isolated conifer forests on the northern slopes of the Qilian Mountain Range, on the northeast edge of the Tibetan Plateau in Qinghai and Gansu provinces of north-central China.
The Changbai Mountains mixed forests ecoregion covers the Changbai Mountains and surrounding foothills in China and North Korea. The region features extensive and naturally preserved deciduous and conifer forests. The region exhibits high biodiversity due to its relative isolation, temperate climate with high rainfall, and centrality to central Chinese, Siberian, and European floral communities. In 1979, a significant portion of the ecoregion was designated the Changbaishan Biosphere Reserve by UNESCO.
The Changjiang Plain evergreen forests ecoregion covers the plain of the Yangtze River (Changjiang) from where it leaves the mountains at the Three Gorges in the west, to the mouth of the Yangtze at the East China Sea. This plain is one of the most densely populated areas on Earth, and most of the original oak and conifer forests have long been converted to agriculture. Extensive wetlands, however, provide habitat for migratory waterfowl and for diverse aquatic species.
The Jiang Nan subtropical evergreen forests ecoregion covers the mountainous divide between the lower Yangtze River and the coastal plain of South China. The region is also a climatic divide between the temperate valleys of the north and the subtropical forests of the south. The region is important for biodiversity and endemic species. The rugged limestone karst hills have been relatively protected from conversion to agriculture, and support specialized plant and animal communities.
The Nihonkai montane deciduous forests ecoregion covers the Nihonkai mountain slopes of Japan's central island of Honshu, including most of the northern half of the island. Also included in the ecoregion are the forested lowland hills of the Oshima Peninsula, which is the southern extension of Hokkaido Island.
The Hokkaido montane conifer forests ecoregion covers the mountainous central regions of Hokkaido Island, the northernmost of Japan's main islands. Forests of spruce and fir thrive in the subalpine, cool climate. On the northeastern edge of the island, the conifer forests extend down to the sea under the influence of the cold Oyashio Current coming down from the north, although logging in recent years has put pressure on these stands.
The Northern Triangle subtropical forests ecoregion covers remote, mountainous terrain in the far north of Myanmar. Due to the regions isolation it is relatively untouched and unexplored by humans. Over 95% of the ecoregion is covered with closed evergreen forest, and importantly for conservation, these forests exist in large contiguous blocks. As of the late 1990s, 140 mammal species were known to be in the region, and new species, such the Leaf muntjac discovered in 1997, are still being found.