Grassland

Source: Wikipedia, the free encyclopedia.
"Greensward" redirects here. For the park plan, see Central Park.
This article is about the landscape of grasslands, a common vegetation type. For other uses, see Grassland (disambiguation).
Nachusa Grasslands, spring 2016
Setaria pumila, a species of Poaceae (the dominant plant family in grasslands)

A grassland is an area where the

legumes, like clover, and other herbs. Grasslands occur naturally on all continents except Antarctica and are found in most ecoregions of the Earth. Furthermore, grasslands are one of the largest biomes on Earth and dominate the landscape worldwide.[1] There are different types of grasslands: natural grasslands, semi-natural grasslands,[2] and agricultural grasslands.[1] They cover 31–69% of the Earth's land area.[3][4]

Definitions

Coxilhas (hills covered by grasslands) in the Pampas, Rio Grande do Sul state, Brazil

Included among the variety of definitions for grasslands are:

  • "...any plant community, including harvested forages, in which grasses and/or legumes make up the dominant vegetation."[1]
  • "...terrestrial ecosystems dominated by herbaceous and shrub vegetation, and maintained by fire, grazing, drought and/or freezing temperatures." (Pilot Assessment of Global Ecosystems, 2000)[1]
  • "A region with sufficient average annual precipitation (25-75 cm) to support grass..." (Stiling, 1999)[1]

Semi-natural grasslands are a very common subcategory of the grasslands biome.[5] These can be defined as:

  • Grassland existing as a result of human activity (mowing or livestock grazing), where environmental conditions and the species pool are maintained by natural processes.[6]

They can also be described as the following:

  • "Semi-natural grasslands are one of the world's most biodiverse habitats on a small spatial scales."[7]
  • "Semi-natural grasslands belong to the most species rich ecosystems in the world."[8]
  • "...have been formed over the course of centuries through extensive grazing and mowing."[7]
  • "...without the use of pesticides or fertilisers in modern times."[9]

There are many different types of semi-natural grasslands, e.g. hay meadows.[9]

Evolutionary history

The graminoids are among the most versatile life forms. They became widespread toward the end of the Cretaceous period, and coprolites of fossilized dinosaur feces have been found containing phytoliths of a variety of grasses that include grasses that are related to modern rice and bamboo.

The appearance of mountains in the western United States during the Miocene and Pliocene epochs, a period of some 25 million years, created a continental climate favourable to the evolution of grasslands.[10]

Around 5 million years ago during the Late Miocene in the New World and the Pliocene in the Old World, the first true grasslands occurred. Existing forest biomes declined, and grasslands became much more widespread. It is known that grasslands have existed in Europe throughout the Pleistocene (the last 1.8 million years).[9] Following the Pleistocene ice ages (with their glacials and interglacials), grasslands expanded in the hotter, drier climates, and began to become the dominant land feature worldwide.[10] Since the grasslands have existed for over 1.8 million years, there is high variability. For example steppe-tundra dominated in Northern and Central Europe whereas a higher amount of xerothermic grasslands occurred in the Mediterranean area.[9] Within temperate Europe, the range of types is quite wide and also became unique due to the exchange of species and genetic material between different biomes.

The semi-natural grasslands first appeared when humans started farming. So for the use of agriculture, forests got cleared in Europe. Ancient meadows and pastures were the parts that were suitable for cultivation. The semi-natural grasslands were formed from these areas.[9] However, there's also evidence for the local persistence of natural grasslands in Europe, originally maintained by wild herbivores, throughout the pre-Neolithic Holocene.[11][12] The removal of the plants by the grazing animals and later the mowing farmers led to co-existence of other plant species around. In the following, the biodiversity of the plants evolve. Also, the species that already lived there adapted to the new conditions.[9]

Most of the grassland areas have been turned to arable fields and disappeared again. The grasslands permanently became arable cropping fields due to the steady decrease in organic matter.[13] Nowadays, semi-natural grasslands are rather located in areas that are unsuitable for agricultural farming.[9]

Ecology

Biodiversity

Grasslands dominated by unsown wild-plant communities ("unimproved grasslands") can be called either natural or "semi-natural" habitat. Although their plant communities are natural, their maintenance depends upon anthropogenic activities such as grazing and cutting regimes. The semi-natural grasslands contain many species of wild plants, including grasses, sedges, rushes, and herbs; 25 plant-species per 100 square centimeters can be found.[9] A European record that was found on a meadow in Estonia described 76 species of plants in one square meter.[9] Chalk downlands in England can support over 40 species per square meter.

Black rhino

In many parts of the world, few examples have escaped agricultural improvement (fertilizing, weed killing, plowing, or re-seeding). For example, original North American prairie grasslands or lowland wildflower meadows in the UK are now rare and their associated wild flora equally threatened. Associated with the wild-plant diversity of the "unimproved" grasslands is usually a rich invertebrate fauna; there are also many species of birds that are grassland "specialists", such as the snipe and the little bustard.[14] Owing to semi-natural grasslands being referred to as one of the most-species rich ecosystems in the world and essential habitat for many specialists, also including pollinators,[8] there are many approaches to conservation activities lately.

Agriculturally improved grasslands, which dominate modern intensive agricultural landscapes, are usually poor in wild plant species due to the original diversity of plants having been destroyed by cultivation and by the use of fertilizers.

Almost 90% of the European semi-natural grasslands do not exist anymore due to political and economic reasons. This loss took place during the 20th century.[7] The ones in Western and Central Europe have almost disappeared completely. There are a few left in Northern Europe.[7]

Unfortunately, a large amount of red-listed species are specialists of semi-natural grasslands and are affected by the landscape change due to agriculture of the last century.[15]

The original wild-plant communities having been replaced by sown monocultures of cultivated varieties of grasses and clovers, such as

white clover
. In many parts of the world, "unimproved" grasslands are one of the most threatened types of habitat, and a target for acquisition by wildlife conservation groups or for special grants to landowners who are encouraged to manage them appropriately.

Vegetation

Quercus robur, also known as the English oak, dominating the semi-natural grasslands

Grassland vegetation can vary considerably depending on the grassland type and on how strong it is affected by human impact. Dominant trees for the semi-natural grassland are Quercus robur, Betula pendula, Corylus avellana, Crataegus and many kinds of herbs.[16]

In chalk grassland, the plants can vary from very tall to very short. Quite tall grasses can be found in North American tallgrass prairie, South American grasslands, and African savanna. Woody plants, shrubs or trees may occur on some grasslands—forming savannas, scrubby grassland or semi-wooded grassland, such as the African savannas or the Iberian deheza.[17]

As flowering plants and trees, grasses grow in great concentrations in climates where annual rainfall ranges between 500 and 900 mm (20 and 35 in).[18] The root systems of perennial grasses and forbs form complex mats that hold the soil in place.

Fauna

Mountain plover

Grasslands support the greatest aggregations of large animals on Earth, including jaguars, African wild dogs,

fungi, extend the root systems, break apart hard soil, enrich it with urea and other natural fertilizers, trap minerals and water and promote growth. Some types of fungi make the plants more resistant to insect and microbial attacks.[20]

Cheetah

Grassland in all its form supports a vast variety of mammals, reptiles, birds, and insects. Typical large mammals include the blue wildebeest, American bison, giant anteater, and Przewalski's horse.[21]

The plants and animals that live in grasslands are connected through an unlimited web of interactions. But the removal of key species—such as buffalo and prairie dogs within the American West—and introduction of invasive species, like cane toads in northern Australia, have disrupted the balance in these ecosystems and damaged a number of other species.[19] Grasslands are home to a number of the foremost magnificent animals on the planet—elephants, bison, lions—and hunters have found them to be enticing prey. But when hunting is not controlled or is conducted illegally, species can become extinct.[19]

Ecosystem services

Grasslands provide a range of marketed and non-marketed ecosystem services that are fundamental to the livelihoods of an estimated one billion people globally.[22]

Carbon sequestration

Grasslands hold about twenty percent of global soil carbon stocks.[3] Herbaceous (non-wooded) vegetation dominates grasslands and carbon is stored in the roots and soil underground. Above-ground biomass carbon is relatively short-lived due to grazing, fire, and senescence. Grassland species have an extensive fibrous root system, with grasses often accounting for 60-80% of the biomass carbon in this ecosystem. This underground biomass can extend several meters below the surface and store abundant carbon into the soil, resulting in deep, fertile soils with high organic matter content. For this reason, soil carbon accounts for about 81% of the total ecosystem carbon in grasslands. The close link between soil carbon and underground biomass leads to similar responses of these carbon pools to fluctuations in annual precipitation and temperature on a broad spatial scale. Because plant productivity is limited by grassland precipitation, carbon stocks are highest in regions where precipitation is heaviest, such as the high grass prairie in the humid temperate region of the United States. Similarly, as annual temperatures rise, grassland carbon stocks decrease due to increased evapotranspiration.[23]

Grasslands have suffered large losses of

organic carbon due to soil disturbances, vegetation degradation, fires, erosion, nutrient deficiencies, and water shortages. The type, frequency and intensity of the disturbance can play a key role in the soil organic carbon (SOC) balance of grasslands. Bedrock, irrigation practices, soil acidification, liming, and pasture management can all have potential impacts on grassland organic carbon stocks.[24] Good grassland management can reverse historical soil carbon losses.[3][25] The relationship of improved biodiversity with carbon storage is subject of research.[26]

There is a lack of agreement on the amount of carbon that can be stored in grassland ecosystem. This is partly caused by different methodologies applied to measure soil organic carbon and limited respective datasets. Further, carbon accumulation in soils changes significantly over time and point in time measurements produce an insufficient evidence base.[27]

Other ecosystem services

  • promotion of genetic diversity
  • weather amelioration[28]
  • provision of wildlife habitat

Degradation

Grasslands are among the most threatened ecosystems.[29] Global losses from grassland degradation are estimated to be over $7 billion per year.[30] According to the International Union for the Conservation of Nature (IUCN), the most significant threat to grasslands is human land use, especially agriculture and mining.[31] The vulnerability of grasslands stems from a range of factors, such as misclassification, poor protection and cultivation.[22]

Causes

Land use intensification

Grasslands have an extensive history of

human activity and disturbance.[32] To feed a growing human population, most of the world's grasslands are converted from natural landscapes to fields of corn, wheat or other crops. Grasslands that have remained largely intact thus far, such as the East African savannas, are in danger of being lost to agriculture.[19]
Grasslands are very sensitive to disturbances, such as people hunting and killing key species, or plowing the land to make more space for farms.

Grassland vegetation is often a

plagioclimax; it remains dominant in a particular area usually due to grazing, cutting, or natural or man-made fires, all discouraging colonization by and survival of tree and shrub seedlings.[33] Some of the world's largest expanses of grassland are found in the African savanna, and these are maintained by wild herbivores as well as by nomadic pastoralists and their cattle, sheep or goats. Grasslands have an impact on climate change by slower decomposition rates of litter compared to forest environments.[34]

Main land-cover trajectories from the 1960s to 2015

Grasslands may occur naturally or as a result of human activity. Hunting cultures around the world often set regular fires to maintain and extend grasslands and prevent fire-intolerant trees and shrubs from taking hold. The tallgrass

Neolithic Period when people gradually cleared the forest to create areas for raising their livestock.[35]

Climate change

Grasslands often occur in areas with annual precipitation is between 600 mm (24 in) and 1,500 mm (59 in) and average mean annual temperatures ranges from −5 and 20 °C.

serpentine barrens and calcareous grasslands, where woody encroachment is prevented as low nutrient levels in the soil may inhibit the growth of forest and shrub species. Another common predicament often experienced by the ill-fated grassland creatures is the constant burning of plants, fueled by oxygen and many expired photosynthesizing organisms, with the lack of rain pushing this problem to further heights.[37] When not limited by other factors, increasing CO2 concentration in the air increases plant growth, similarly as water use efficiency, which is very important in drier regions. However, the advantages of elevated CO2 are limited by factors including water availability and available nutrients, particularly nitrogen. Thus effects of elevated CO2 on plant growth will vary with local climate patterns, species adaptations to water limitations, and nitrogen availability. Studies indicate that nutrient depletion may happen faster in drier regions, and with factors like plant community composition and grazing. Nitrogen deposition from air pollutants and increased mineralization from higher temperatures can increase plant productivity, but increases are often among a discount in biodiversity as faster-growing plants outcompete others. A study of a California grassland found that global change may speed reductions in diversity and forb species are most prone to this process.[23]

Afforestation or introduction of invasive species

Misguided afforestation efforts, for example as part of the global effort to increase carbon sequestration, can harm grasslands and their core ecosystem services.[38][39] Forest centric restoration efforts can create the risk of misreading and misclassifying of landscapes.[22] A map created by the World Resources Institute in collaboration with the IUCN identifies 2 billion hectares for potential forest restoration. It is criticised for including 900 million hectares of grasslands.[40][41] It is expected that non-native grasses will continue to outperform native species under warmer and drier conditions that occur in many grasslands due to climate change.[42]

Management

The type of land management used in grasslands can also lead to grassland loss/degradation. Many grasslands and other open ecosystems depend on

protected areas, in which fire is not allowed and cattle grazing is banned, grasslands were quickly replaced by shrubs (shrub encroachment
).

Types of degradation

Land cover change

Land cover has always changed during the years. The following relates to the changes between 1960 and 2015. There has been a decrease in semi-natural grasslands and an increase in areas with arable land, forest and land used for infrastructure and buildings. The line style and relative thickness of the lines indicates the percentage of the total area that changed. Changes less than 1% and land-cover classes with all changes less than 1% (i.e. semi-natural wetlands and water) are not included.[15]

In 1960 most of the land, 49.7%, was covered with forest and there was also more semi-natural grassland (18.8%) than arable land (15.8%). In 2015 this has changed drastically. The forest cover has increased (50.8%) and arable land has also increased (20.4%), but the semi-natural grassland cover has decreased. Although it still covers a large area of the earth (10.6%).[15]

A quarter of semi-natural grassland was lost through intensification, i.e. it was converted into arable or pasture land and forests.[45] It is more likely that intensification will occur in flat semi-natural grasslands, especially if the soil is fertile. On the other hand, grasslands, where the land is drought-prone or less productive, are more likely to persist as semi-natural grasslands than grasslands with fertile soil and low gradient of the terrain.[46] Furthermore, the accessibility of the land is also important, as it is then easier to fertilize, for example. For instance, if it is located near a road. With the development of technology, it is becoming increasingly easy to cultivate land with a steeper gradient, to the detriment of grasslands. The management of grasslands is also changing permanently. There is increased use of mineral fertilizers, furthermore borders and field edges are removed to enlarge fields and leveling the terrain to facilitate the use of agricultural machinery.[15]

The professional study of dry grasslands falls under the category of

ecosystem services associated with the grass-dominated arid and semi-arid rangelands of the world. Rangelands account for an estimated 70% of the earth's landmass; thus, many cultures including those of the United States are indebted to the economics that the world's grasslands have to offer, from producing grazing animals, tourism, ecosystems services such as clean water and air, and energy extraction.[47]

Main article: Woody plant encroachment

Vast areas of grassland are affected by woody encroachment, which is the expansion of woody plants at the expense of the herbaceous layer. Woody encroachment is caused by a combination of human impact (e.g. fire exclusion, overstocking and resulting overgrazing) and environmental factors (i.e. increased CO2 levels in the atmosphere). It can have severe negative consequences on key ecosystem services, like land productivity and groundwater recharge.

Conservation and restoration

Despite growing recognition of the importance of grasslands, understanding of restoration options remains limited.[48] Cost of grassland restoration is highly variable and respective data is scarce.[49] Successful grassland restoration has several dimensions, including recognition in policy, standardisation of indicators of degradation, scientific innovation, knowledge transfer and data sharing.[50]

Restoration methods and measures include the following:[51]

  • prescribed fires
  • appropriate management of livestock and wild herbivores: in light of land use intensification caused by global food demand, grassland land use practices may need to be adjusted to better support key ecosystem services.[52]
  • tree cutting
  • shrub removal
  • invasive species control
  • reintroduction of native grasses and forbs via seeding or transplant: a main challenge for grassland restoration is how to overcome seed limitation.[48]

For the period 2021–2030 the United Nations General Assembly has proclaimed the UN Decade on Restoration, involving a joint resolution by over 70 countries. It is led by the United Nations Environment Programme and the Food and Agriculture Organization.[53]

Types of grasslands

Meadow by the Desna river in Ukraine

Classifications of grassland

Grassland types by Schimper (1898, 1903):[54]

  • Meadow (hygrophilous or tropophilous grassland)
  • Steppe (xerophilous grassland)
  • Savannah (xerophilous grassland containing isolated trees)
    Steppe family: a common grassland animal, the swift fox

Grassland types by Ellenberg and Mueller-Dombois (1967):[55]

Formation-class V. Terrestrial herbaceous communities

  1. Savannas and related grasslands (tropical or subtropical grasslands and parklands)
  2. Steppes and related grasslands (e.g. North American "prairies" etc.)
  3. Meadows, pastures or related grasslands
  4. Sedge swamps and flushes
  5. Herbaceous and half-woody salt swamps
  6. Forb vegetation
    A hike through the Tallgrass Prairie Heritage Park in Canada

Grassland types by Laycock (1979):[56]

  1. Tallgrass (true) prairie
  2. Shortgrass prairie
  3. Mixed-grass prairie
  4. Shrub steppe
  5. Annual grassland
  6. Desert (arid) grassland
  7. High mountain grassland

General grasslands types

Tropical and subtropical

These grasslands can be classified as the tropical and subtropical grasslands, savannas and shrublands biome. The rainfall level for that grassland type is between 90 and 150 centimeters per year. Grasses and scattered trees are common for that ecoregion, as well as large mammals, such as wildebeest (Connochaetes taurinus) and zebra (Equus zebra). Notable tropical and subtropical grasslands include the Llanos grasslands of South America.[57]

Western Sydney

Temperate

Mid-latitude grasslands, including the

jack rabbits, skunks, coyotes, snakes, foxes, owls, badgers, blackbirds, grasshoppers, meadowlarks, sparrows, quails, hawks and hyenas.[58]

Flooded

Grasslands that are flooded seasonally or year-round, like the

orchids, 300 bird species, and 150 fish
species.

Water-meadows are grasslands that are deliberately flooded for short periods.[59]

Grassland in the Antelope Valley, California

Montane

High-altitude grasslands located on high

Andes Mountains. They are part of the montane grasslands and shrublands biome and can be tropical, subtropical, and temperate. The plants and animals, that can be found in the tropical montane, are able to adapt to cool, wet conditions as well as intense sunlight.[60]

Tundra grasslands

Similar to montane grasslands, polar

Eurasian steppe.[61]

Desert and xeric

Also called desert grasslands, they are composed of sparse grassland ecoregions located in the deserts and xeric shrublands biome. Temperature extremes and low amount of rainfall characterise these kinds of grasslands. Therefore, plants and animals are well adapted to minimize water loss.[62]

Temperate grasslands, savannas, and shrublands ecoregions

The grassland

ecoregions of the temperate grasslands, savannas, and shrublands biome
are:

Afrotropical temperate grasslands, savannas, and shrublands ecoregions
Al Hajar montane woodlands Oman, United Arab Emirates
Amsterdam and Saint-Paul Islands temperate grasslands Amsterdam Island, Saint-Paul Island
Tristan da Cunha–Gough Islands shrub and grasslands Tristan da Cunha, Gough Island
Australasian temperate grasslands, savannas, and shrublands ecoregions
Canterbury–Otago tussock grasslands New Zealand
Eastern Australia mulga shrublands
 Australia
Southeast Australia temperate savanna Australia
t
  • e
    • California Central Valley grasslands United States
    Canadian aspen forests and parklands Canada, United States
    Central and Southern mixed grasslands
    		 United States
    Central forest–grasslands transition United States
    Central tall grasslands United States
    Columbia Plateau United States
    Edwards Plateau savanna United States
    Flint Hills tall grasslands
    		 United States
    Montana valley and foothill grasslands United States
    Nebraska Sand Hills mixed grasslands United States
    Northern mixed grasslands
    		 Canada, United States
    Northern short grasslands
    		 Canada, United States
    Northern tall grasslands
    		 Canada, United States
    Palouse grasslands United States
    Texas blackland prairies
    		 United States
    Western short grasslands United States
    t
  • e
    • Argentine Espinal Argentina
    Argentine Monte Argentina
    Humid Pampas Argentina, Uruguay
    Patagonian grasslands Argentina, Chile, United Kingdom (Falkland Islands)
    Patagonian steppe
    		 Argentina, Chile, United Kingdom (Falkland Islands)
    Semi-arid Pampas Argentina
    t
  • e
    • Alai–Western Tian Shan steppe Kazakhstan, Tajikistan, Uzbekistan
    Altai steppe and semi-desert Kazakhstan
    Central Anatolian steppe Turkey
    Daurian forest steppe China, Mongolia, Russia
    Eastern Anatolian montane steppe Armenia, Azerbaijan, Georgia, Iran, Turkey
    Emin Valley steppe China, Kazakhstan
    Faroe Islands boreal grasslands Faroe Islands, Denmark
    Gissaro–Alai open woodlands Kyrgyzstan, Tajikistan, Uzbekistan
    Kazakh forest steppe Kazakhstan, Russia
    Kazakh steppe
    		 Kazakhstan, Russia
    Kazakh Uplands Kazakhstan
    Mongolian–Manchurian grassland China, Mongolia, Russia
    Pontic steppe
    		 Kazakhstan, Moldova, Romania, Russia, Ukraine, Bulgaria
    Sayan Intermontane steppe
    		 Russia
    Selenge–Orkhon forest steppe Mongolia, Russia
    South Siberian forest steppe Russia
    Syrian xeric grasslands and shrublands
    		 Iraq, Jordan, Syria
    Tian Shan foothill arid steppe China, Kazakhstan, Kyrgyzstan

    Tropical and subtropical grasslands, savannas, and shrublands ecoregions

    Afrotropical tropical and subtropical grasslands, savannas, and shrublands ecoregions
    Angolan miombo woodlands Angola
    Angolan mopane woodlands Angola, Namibia
    Ascension scrub and grasslands Ascension Island
    Central Zambezian miombo woodlands Angola, Burundi, Democratic Republic of the Congo, Malawi, Tanzania, Zambia
    East Sudanian savanna Cameroon, Central African Republic, Chad, Democratic Republic of the Congo, Eritrea, Ethiopia, South Sudan, Sudan, Uganda
    Eastern miombo woodlands Mozambique, Tanzania
    Guinean forest–savanna mosaic
    Guinea Bissau, Ivory Coast, Nigeria, Senegal, Togo
    Itigi–Sumbu thicket Tanzania, Zambia
    Kalahari Acacia-Baikiaea woodlands
    		 Botswana, Namibia, South Africa, Zimbabwe
    Mandara Plateau mosaic Cameroon, Nigeria
    Northern Acacia–Commiphora bushlands and thickets Ethiopia, Kenya, South Sudan, Uganda
    Northern Congolian forest–savanna mosaic Cameroon, Central African Republic, Democratic Republic of the Congo, South Sudan, Uganda
    Sahelian Acacia savanna
    		 Burkina Faso, Cameroon, Cape Verde, Chad, Eritrea, Ethiopia, Mali, Mauritania, Niger, Nigeria, Senegal, South Sudan, Sudan
    Serengeti volcanic grasslands Kenya, Tanzania
    Somali Acacia–Commiphora bushlands and thickets Eritrea, Ethiopia, Kenya, Somalia
    South Arabian fog woodlands, shrublands, and dune Oman, Saudi Arabia, Yemen
    Southern Acacia–Commiphora bushlands and thickets Kenya, Tanzania
    Southern Africa bushveld
    		 Botswana, South Africa, Zimbabwe
    Southern Congolian forest–savanna mosaic Angola, Democratic Republic of the Congo
    Southern miombo woodlands Malawi, Mozambique, Zambia, Zimbabwe
    Saint Helena scrub and woodlands Saint Helena
    Victoria Basin forest–savanna mosaic Burundi, Democratic Republic of the Congo, Ethiopia, Kenya, Rwanda, South Sudan, Tanzania, Uganda
    West Sudanian savanna
    Gambia, Ghana, Guinea,Mali, Ivory Coast, Niger, Nigeria, Senegal
    Western Congolian forest–savanna mosaic Angola, Democratic Republic of the Congo, Republic of the Congo
    Western Zambezian grasslands Angola, Zambia
    Zambezian and mopane woodlands Botswana, Eswatini, Malawi, Mozambique, Namibia, South Africa, Zambia, Zimbabwe
    Zambezian Baikiaea woodlands Angola, Botswana, Namibia, Zambia, Zimbabwe
    Australasian tropical and subtropical grasslands, savannas, and shrublands ecoregions
    Arnhem Land tropical savanna Australia
    Brigalow tropical savanna
    		 Australia
    Cape York Peninsula tropical savanna Australia
    Carpentaria tropical savanna Australia
    Einasleigh Uplands savanna
    		 Australia
    Kimberley tropical savanna Australia
    Mitchell grass downs
    		 Australia
    Trans-Fly savanna and grasslands Indonesia, Papua New Guinea
    Victoria Plains tropical savanna Australia
    Indomalayan tropical and subtropical grasslands, savannas, and shrublands ecoregions
    Terai–Duar savanna and grasslands Bhutan, India, Nepal
    t
  • e
    • Western Gulf coastal grasslands Mexico, United States
    t
  • e
    • Beni savanna
    		 Bolivia
    Campos rupestres Brazil
    Cerrado Bolivia, Brazil, Paraguay
    Clipperton Island shrub and grasslands Clipperton Island is an overseas territory of France
    Córdoba montane savanna
    		 Argentina
    Guianan savanna Brazil, Guyana, Venezuela
    Humid Chaco Argentina, Brazil, Paraguay, Uruguay
    Llanos Venezuela, Colombia
    Uruguayan savanna Argentina, Brazil, Uruguay
    Oceanian tropical and subtropical grasslands, savannas, and shrublands ecoregions
    Hawaiian tropical high shrublands Hawaiʻi
    Hawaiian tropical low shrublands Hawaiʻi
    Northwestern Hawaii scrub Hawaiʻi, Midway Atoll

    See also

    References

    1. ^
      OCLC 308648056.{{cite book}}: CS1 maint: location missing publisher (link
      )
    2. PMID 39163831
      .
    3. ^
      OCLC 890677450
      .
    4. OCLC 1059413892
      .
    5. ISBN 978-92-893-4241-4
      .
    6. ISSN 1613-9801
      .
    7. ^
      OCLC 1038678595
      .
    8. ^
      hdl:11250/2612648
      .
    9. ^ a b c d e f g h i Pärtel, M. (2005). "Biodiversity in temperate European grasslands: origin and conservation". Grassland Science in Europe. 10: 1–14.
    10. ^ a b "University of California Museum of Paleontology Grasslands website". University of California Museum of Paleontology. Retrieved 2011-12-01.
    11. ISSN 0142-5242
      .
    12. ISSN 0006-3207
      . Retrieved 4 February 2024 – via Elsevier Science Direct.
    13. S2CID 25639544
      .
    14. OCLC 948690426.{{cite book}}: CS1 maint: location missing publisher (link
      )
    15. ^
      ISSN 1747-423X
      .
    16. JSTOR 23726791
      .
    17. ^ "University of California Museum of Paleontology". University of California Museum of Paleontology. Retrieved 2020-05-20.
    18. ^ "NASA Earth Observatory webpage". Earthobservatory.nasa.gov. Archived from the original on 2000-10-27. Retrieved 2011-12-01.
    19. ^
      World Wildlife Fund
      . Retrieved 2020-05-20.
    20. ISBN 978-953-51-0719-4
      .
    21. ^ "44.3D: Temperate Grasslands". Biology LibreTexts. 2018-07-17. Retrieved 2020-05-20.
    22. ^
      S2CID 251265576
      .
    23. ^ a b "Grassland Carbon Management | Climate Change Resource Center". www.fs.usda.gov. Retrieved 2020-05-20.
    24. ISBN 978-3-319-92317-8. {{cite book}}: |work= ignored (help
      )
    25. OCLC 44174278.{{cite book}}: CS1 maint: others (link
      )
    26. PMID 28435876
      .
    27. PMID 38264781
      .
    28. OCLC 1231779567
      .
    29. doi:10.1111/j.1461-0248.2004.00686.x
      .
    30. ^ "Large scale land investments, household displacement and the effect on land degradation in semiarid agro-pastoral areas of Ethiopia".
    31. IUCN
      World Conservation Congress 2020. Retrieved 2021-06-01.
    32. ^ "Grasslands and Climate Change | Climate Change Resource Center". www.fs.usda.gov. Archived from the original on 2020-10-23. Retrieved 2020-05-20.
    33. S2CID 92606851
      .
    34. doi:10.1111/1365-2664.12456
      .
    35. ^ "Grasslands Information and Facts". National Geographic. 2019-03-15. Archived from the original on March 10, 2017. Retrieved 2020-05-20.
    36. ^ "EO Experiments: Grassland Biome". Earthobservatory.nasa.gov. Archived from the original on 2000-10-27. Retrieved 2011-12-01.
    37. PMID 27114579
      .
    38. ^ "Can tree campaigns curb climate change without harming grasslands?". Scienceline. 2021-05-28. Retrieved 2021-06-01.
    39. PMID 33494123
      .
    40. ^ Dasgupta, Shreya (2021-06-01). "Many Tree-Planting Campaigns Are Based on Flawed Science". The Wire Science. Retrieved 2021-06-12.
    41. S2CID 202568025
      .
    42. S2CID 237775557
      .
    43. PMID 29752682
      .
    44. PMID 31964935
      .
    45. ISSN 0169-2046
      .
    46. PMID 25576277
      .
    47. ^ "Grassland of the world". www.fao.org. Food and Agriculture Organization. Archived from the original on 2020-08-18. Retrieved 2020-05-20.
    48. ^
      S2CID 52816465
      .
    49. S2CID 236416000
      .
    50. S2CID 237426110
      .
    51. S2CID 225160067
      .
    52. ISSN 2071-1050
      .
    53. ^ "About the UN Decade". UN Decade on Restoration. Retrieved 2021-06-01.
    54. ^ Schimper, A. F. W. (1903) [1898]. Pflanzen-Geographie auf physiologischer Grundlage [Plant geography on a physiological basis] (in German). Translated by Fisher, Jena.
    55. ^ Ellenberg, H. & D. Mueller-Dombois. 1967. Tentative physiognomic-ecological classification of plant formations of the Earth [based on a discussion draft of the UNESCO working group on vegetation classification and mapping.] Berichte des Geobotanischen Institutes der Eidg. Techn. Hochschule, Stiftung Rübel, Zürich 37 (1965-1966): 21—55, [1] Archived 2016-10-21 at the Wayback Machine.
    56. ISBN 978-1-4612-6182-7 – via Google Books
      .
    57. World Wildlife Fund
      . Retrieved 2020-05-20.
    58. World Wildlife Fund
      . Retrieved 2020-05-20.
    59. World Wildlife Fund
      . Retrieved 2020-05-20.
    60. World Wildlife Fund
      . Retrieved 2020-05-20.
    61. World Wildlife Fund
      . Retrieved 2020-05-20.
    62. World Wildlife Fund
      . Retrieved 2020-05-20.

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