"Greensward" redirects here.
For park plan, see Central Park.
This article is about the landscape of grasslands, a common vegetation type.
For other uses, see Grassland (disambiguation).
Furthermore, grasslands are one of the largest biomes on earth and dominate the landscape worldwide.
They cover 31-43% of the Earth's land area.
There are different types of grasslands: natural grasslands, semi-natural grasslands, and agricultural grasslands.
There are a variety of definitions for "grasslands":
- "...any plant community, including harvested forages, in which grasses and/or legumes make up the dominant vegetation."
- "...terrestrial ecosystems dominated by herbaceous and shrub vegetation, and maintained by fire, grazing, drought and/or freezing temperatures." (Pilot Assessment of Global Ecosystems, 2000)
- "A region with sufficient average annual precipitation (25-75 cm) to support grass..." (Stiling, 1999)
Semi-natural grasslands are a very common subcategory of the grasslands biome.
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.
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."
- "Semi-natural grasslands belong to the most species rich ecosystems in the world."
- "...have been formed over the course of centuries through extensive grazing and mowing."
- „...without the use of pesticides or fertilisers in modern time“
There are many diiferent types types of semi-natural grasslands, e.g. hay meadows.
Types of grassland
Classifications of grasslands
Grassland types by Schimper (1898, 1903):
- Meadow (hygrophilous or tropophilous grassland)
- Steppe (xerophilous grassland)
- Savannah (xerophilous grassland containing isolated trees)
Grassland types by Ellenberg and Mueller-Dombois (1967):
Formation-class V. Terrestrial herbaceous communities
- Savannas and related grasslands (tropical or subtropical grasslands and parklands)
- Steppes and related grasslands (e.g. North American "prairies" etc.)
- Meadows, pastures or related grasslands
- Sedge swamps and flushes
- Herbaceous and half-woody salt swamps
- Forb vegetation
Grassland types by Laycock (1979):
- Tallgrass (true) prairie
- Shortgrass prairie
- Mixed-grass prairie
- Shrub steppe
- Annual grassland
- Desert (arid) grassland
- High mountain grassland
General grassland 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 90-150 centimeters per year.
They are classified with temperate savannas and shrublands as the temperate grasslands, savannas, and shrublands biome.
Grasslands that are flooded seasonally or year-round, like the Everglades of Florida, the Pantanal of Brazil, Bolivia and Paraguay or the Esteros del Ibera in Argentina, are classified with flooded savannas as the flooded grasslands and savannas biome and occur mostly in the tropics and subtropics.
The species that live in these grasslands are well adapted to the hydrologic regimes and soil conditions.
Water-meadows are grasslands that are deliberately flooded for short periods.
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.
Similar to montane grasslands, polar Arctic tundra can have grasses, but high soil moisture means that few tundras are grass-dominated today.
These areas were very cold and arid and featured sub-surface permafrost (hence tundra) but were nevertheless productive grassland ecosystems supporting a wide variety of fauna.
As the temperature increased and the climate became wetter at the beginning of the Holocene much of the mammoth steppe transitioned to forest, while the drier parts in central Eurasia remained as a grassland, becoming the modern Eurasian steppe.
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.
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 favorable to the evolution of grasslands.
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).
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.
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 probably first appeared with the human starting 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.
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.
Most of the grassland areas have been turned to arable fields and disappeared again.
Nowadays, semi-natural grasslands are rather located in areas that are unsuitable for agricultural farming.
Biodiversity and conservation
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.
A European record that was found on a meadow in Estonia described 76 species of plants in one square meter.
Chalk downlands in England can support over 40 species per square meter.
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.
Due 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, 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 only took place during the 20th century.
The ones in Western and Central Europe have almost disappeared completely.
There are a few left in Northern Europe.
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.
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.
Grassland vegetation can vary considerably depending on the grassland type and on how strong it is affected by human impact.
In chalk grassland, the plants can vary from height to very short.
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.
Grasslands support the greatest aggregations of large animals on earth, including jaguars, African wild dogs, pronghorn, black-footed ferret, plains bison, mountain plover, African elephant, Sunda tiger, black rhino, white rhino, savanna elephant, greater one-horned rhino, Indian elephant and swift fox.
Some types of fungi make the plants more resistant to insect and microbial attacks.
Grassland in all its form supports a vast variety of mammals, reptiles, birds, and insects.
Grasslands are very sensitive to disturbances, such as people hunting and killing key species, or plowing the land to make more space for farms.
To feed a growing human population, most of the world's grasslands, including the American prairies, are converted from natural landscapes to fields of corn, wheat or other crops.
Grasslands that have remained largely intact thus far, like East African savannas, are in danger of being lost to agriculture.
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.
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 isn't controlled or is conducted illegally, species can become extinct.
Effects of 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.
However, some grasslands occur in colder (−20 °C) and hotter (30 °C) climatic conditions.
Grassland can exist in habitats that are frequently disturbed by grazing or fire, as such disturbance prevents the encroachment of woody species.
Species richness is particularly high in grasslands of low soil fertility such as 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.
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.
Human impact and economic importance
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.
Grasslands have an impact on climate change by slower decomposition rates of litter compared to forest environments.
Herbaceous (non-wooded) vegetation dominates grasslands and, unlike forests, carbon is stored in the roots and soil underground.
Furthermore, this above-ground biomass carbon is relatively short-lived due to grazing, fire, and senescence.
In contrast, 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.
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.
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.
Land cover has always changed during the years.
The following relates to the changes between 1960 and 2015.
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.
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%).
A quarter of semi-natural grassland was lost through intensification, i.e. it was converted into arable or pasture land and forests.
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.
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.
The professional study of dry grasslands falls under the category of rangeland management, which focuses on 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.
Temperate grasslands, savannas, and shrublands ecoregions
|Australasian temperate grasslands, savannas, and shrublands|
|Canterbury-Otago tussock grasslands||New Zealand|
|Eastern Australia mulga shrublands||Australia|
|Southeast Australia temperate savanna||Australia|
|Neotropical temperate grasslands, savannas, and shrublands|
|Humid Pampas||Argentina, Uruguay|
Tropical and subtropical grasslands, savannas, and shrublands ecoregions
|Australasian tropical and subtropical grasslands, savannas, and shrublands|
|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|
|Terai-Duar savanna and grasslands||Bhutan, India, Nepal|
|Nearctic tropical and subtropical grasslands, savannas, and shrublands|
|Western Gulf coastal grasslands||Mexico, United States|
|Neotropical tropical and subtropical grasslands, savannas, and shrublands|
|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|
|Gran Chaco||Argentina, Brazil, Paraguay, Bolivia|
|Uruguayan savanna||Argentina, Brazil, Uruguay|
|Oceanian tropical and subtropical grasslands, savannas, and shrublands|
|Hawaiian tropical high shrublands||Hawaiʻi|
|Hawaiian tropical low shrublands||Hawaiʻi|
|Northwestern Hawaii scrub||Hawaiʻi, Midway Atoll|
Credits to the contents of this page go to the authors of the corresponding Wikipedia page: en.wikipedia.org/wiki/Grassland.