A riparian zone or riparian area is the interface between land and a

river A river is a natural flowing watercourse, usually freshwater Fresh water or freshwater is any naturally occurring liquid or frozen water containing low concentrations of dissolved salts and other total dissolved solids. Although the ...

or stream. Riparian is also the proper nomenclature for one of the terrestrial

biome A biome () is a biogeographical unit consisting of a biological community that has formed in response to the physical environment in which they are found and a shared regional climate. Biomes may span more than one continent. Biome is a broader ...

s of the Earth. Plant habitats and communities along the river margins and banks are called riparian vegetation, characterized by hydrophilic plants. Riparian zones are important in

ecology Ecology () is the study of the relationships between living organisms, including humans, and their physical environment. Ecology considers organisms at the individual, population, community, ecosystem, and biosphere level. Ecology overl ...

, environmental resource management, and

civil engineering Civil engineering is a professional engineering discipline that deals with the design, construction, and maintenance of the physical and naturally built environment, including public works such as roads, bridges, canals, dams, airports, sewa ...

because of their role in

soil conservation Soil conservation is the prevention of loss of the topmost layer of the soil from erosion or prevention of reduced fertility caused by over usage, acidification, salinization or other chemical soil contamination. Slash-and-burn and other un ...

, their habitat

biodiversity Biodiversity or biological diversity is the variety and variability of life on Earth. Biodiversity is a measure of variation at the genetic ('' genetic variability''), species ('' species diversity''), and ecosystem ('' ecosystem diversity' ...

, and the influence they have on

fauna Fauna is all of the animal life present in a particular region or time. The corresponding term for plants is ''flora'', and for fungi, it is '' funga''. Flora, fauna, funga and other forms of life are collectively referred to as ''biota''. Zoo ...

and

aquatic ecosystem An aquatic ecosystem is an ecosystem formed by surrounding a body of water, in contrast to land-based terrestrial ecosystems. Aquatic ecosystems contain communities of organisms that are dependent on each other and on their environment. The t ...

s, including

grassland A grassland is an area where the vegetation is dominated by grasses (Poaceae). However, sedge (Cyperaceae) and rush ( Juncaceae) can also be found along with variable proportions of legumes, like clover, and other herbs. Grasslands occur natur ...

woodland A woodland () is, in the broad sense, land covered with trees, or in a narrow sense, synonymous with wood (or in the U.S., the '' plurale tantum'' woods), a low-density forest forming open habitats with plenty of sunlight and limited shade (see ...

wetland A wetland is a distinct ecosystem that is flooded or saturated by water, either permanently (for years or decades) or seasonally (for weeks or months). Flooding results in oxygen-free (anoxic) processes prevailing, especially in the soils. The ...

s, or even non-vegetative areas. In some regions, the terms riparian woodland,

riparian forest A riparian forest or riparian woodland is a forested or wooded area of land adjacent to a body of water such as a river, stream, pond, lake, marshland, estuary, canal, sink or reservoir. Etymology The term riparian comes from the Latin word ...

riparian buffer A riparian buffer or stream buffer is a vegetated area (a " buffer strip") near a stream, usually forested, which helps shade and partially protect the stream from the impact of adjacent land uses. It plays a key role in increasing water quality ...

zone, riparian corridor, and riparian strip are used to characterize a riparian zone. The word ''riparian'' is derived from

Latin Latin (, or , ) is a classical language belonging to the Italic branch of the Indo-European languages. Latin was originally a dialect spoken in the lower Tiber area (then known as Latium) around present-day Rome, but through the power ...

'' ripa'', meaning "

river bank Riverbank or river bank may refer to: *Bank (geography), the bank of a river Places *Riverbank, California *Riverbank, former name of Bryte, California Enterprises and organizations *Riverbank Academy, a special school in Coventry, England * Ri ...

Characteristics

Riparian zones may be natural or engineered for soil stabilization or restoration. These zones are important natural biofilters, protecting aquatic environments from excessive

sediment Sediment is a naturally occurring material that is broken down by processes of weathering and erosion, and is subsequently transported by the action of wind, water, or ice or by the force of gravity acting on the particles. For example, sa ...

ation, polluted

surface runoff Surface runoff (also known as overland flow) is the flow of water occurring on the ground surface when excess rainwater, stormwater, meltwater, or other sources, can no longer sufficiently rapidly infiltrate in the soil. This can occur when the ...

, and

erosion Erosion is the action of surface processes (such as water flow or wind) that removes soil, rock, or dissolved material from one location on the Earth's crust, and then transports it to another location where it is deposited. Erosion is di ...

. They supply shelter and food for many

aquatic animal An aquatic animal is any animal, whether invertebrate or vertebrate, that lives in water for most or all of its lifetime. Many insects such as mosquitoes, mayflies, dragonflies and caddisflies have aquatic larvae, with winged adults. Aquatic a ...

s and shade that limits stream temperature change. When riparian zones are damaged by

construction Construction is a general term meaning the art and science to form objects, systems, or organizations,"Construction" def. 1.a. 1.b. and 1.c. ''Oxford English Dictionary'' Second Edition on CD-ROM (v. 4.0) Oxford University Press 2009 and ...

agriculture Agriculture or farming is the practice of cultivating plants and livestock. Agriculture was the key development in the rise of sedentary human civilization, whereby farming of domesticated species created food surpluses that enabled peop ...

silviculture Silviculture is the practice of controlling the growth, composition/structure, and quality of forests to meet values and needs, specifically timber production. The name comes from the Latin ('forest') and ('growing'). The study of forests and wo ...

, biological restoration can take place, usually by human intervention in erosion control and revegetation. If the area adjacent to a

watercourse A stream is a continuous body of surface water flowing within the bed and banks of a channel. Depending on its location or certain characteristics, a stream may be referred to by a variety of local or regional names. Long large streams ...

has standing water or saturated soil for as long as a season, it is normally termed a

because of its

hydric soil Hydric soil is soil which is permanently or seasonally saturated by water, resulting in anaerobic conditions, as found in wetlands. Overview Most soils are aerobic. This is important because plant roots respire (that is, they consume oxygen an ...

characteristics. Because of their prominent role in supporting a diversity of species, riparian zones are often the subject of national protection in a biodiversity action plan. These are also known as a "plant or vegetation waste buffer". Research shows that riparian zones are instrumental in

water quality Water quality refers to the chemical, physical, and biological characteristics of water based on the standards of its usage. It is most frequently used by reference to a set of standards against which compliance, generally achieved through ...

improvement for both surface runoff and water flowing into streams through subsurface or

groundwater Groundwater is the water present beneath Earth's surface in rock and soil pore spaces and in the fractures of rock formations. About 30 percent of all readily available freshwater in the world is groundwater. A unit of rock or an unconsolidat ...

flow. Riparian zones can play a role in lowering nitrate contamination in surface runoff, such as manure and other

fertilizer A fertilizer (American English) or fertiliser (British English; see spelling differences) is any material of natural or synthetic origin that is applied to soil or to plant tissues to supply plant nutrients. Fertilizers may be distinct from ...

s from agricultural fields, that would otherwise damage

ecosystem An ecosystem (or ecological system) consists of all the organisms and the physical environment with which they interact. These biotic and abiotic components are linked together through nutrient cycles and energy flows. Energy enters the syst ...

s and human health. Particularly, the attenuation of

nitrate Nitrate is a polyatomic ion with the chemical formula . Salts containing this ion are called nitrates. Nitrates are common components of fertilizers and explosives. Almost all inorganic nitrates are soluble in water. An example of an insoluble ...

denitrification Denitrification is a microbially facilitated process where nitrate (NO3−) is reduced and ultimately produces molecular nitrogen (N2) through a series of intermediate gaseous nitrogen oxide products. Facultative anaerobic bacteria perform denitr ...

of the nitrates from

in this buffer zone is important. The use of wetland riparian zones shows a particularly high rate of removal of nitrate entering a stream and thus has a place in agricultural management. Also in terms of carbon transport from terrestrial ecosystems to aquatic ecosystems, riparian groundwater can play an important role. As such, a distinction can be made between parts of the riparian zone that connect large parts of the landscape to streams, and riparian areas with more local groundwater contributions.

Roles and functions

Riparian zones dissipate stream energy. The

meander A meander is one of a series of regular sinuous curves in the channel of a river or other watercourse. It is produced as a watercourse erodes the sediments of an outer, concave bank ( cut bank) and deposits sediments on an inner, convex ban ...

ing curves of a river, combined with vegetation and root systems, slow the flow of water, which reduces soil erosion and flood damage. Sediment is trapped, reducing suspended solids to create less turbid water, replenish soils, and build stream banks. Pollutants are filtered from surface runoff, enhancing water quality via biofiltration. The riparian zones also provide

wildlife Wildlife refers to undomesticated animal species, but has come to include all organisms that grow or live wild in an area without being introduced by humans. Wildlife was also synonymous to game: those birds and mammals that were hunted f ...

habitat In ecology, the term habitat summarises the array of resources, physical and biotic factors that are present in an area, such as to support the survival and reproduction of a particular species. A species habitat can be seen as the physical ...

, increased biodiversity, and

wildlife corridor A wildlife corridor, habitat corridor, or green corridor is an area of habitat (ecology), habitat connecting wildlife populations separated by human activities or structures (such as roads, development, or logging). This allows an exchange of i ...

s, enabling aquatic and riparian organisms to move along river systems avoiding isolated communities. Riparian vegetation can also provide

forage Forage is a plant material (mainly plant leaves and stems) eaten by grazing livestock. Historically, the term ''forage'' has meant only plants eaten by the animals directly as pasture, crop residue, or immature cereal crops, but it is also us ...

for wildlife and livestock. Riparian zones are also important for the fish that live within rivers, such as brook and charr. Impacts on riparian zones can affect fish, and restoration is not always sufficient to recover fish populations. They provide native

landscape A landscape is the visible features of an area of land, its landforms, and how they integrate with natural or man-made features, often considered in terms of their aesthetic appeal.''New Oxford American Dictionary''. A landscape includes th ...

irrigation by extending seasonal or perennial flows of water. Nutrients from terrestrial vegetation (e.g.

plant litter Plant litter (also leaf litter, tree litter, soil litter, litterfall or duff) is dead plant material (such as leaves, bark, needles, twigs, and cladodes) that have fallen to the ground. This detritus or dead organic material and its constitue ...

and insect drop) are transferred to aquatic food webs, and are a vital source of energy in aquatic food webs. The vegetation surrounding the stream helps to shade the water, mitigating water temperature changes. Extreme changes in water temperature can have lethal effects on fish and other organisms in the area. The vegetation also contributes wood debris to streams, which is important to maintaining

geomorphology Geomorphology (from Ancient Greek: , ', "earth"; , ', "form"; and , ', "study") is the scientific study of the origin and evolution of topographic and bathymetric features created by physical, chemical or biological processes operating at or ...

. From a social aspect, riparian zones contribute to nearby property values through amenity and views, and they improve enjoyment for footpaths and bikeways through supporting foreshoreway networks. Space is created for riparian sports such as fishing, swimming, and launching for vessels and paddle craft. The riparian zone acts as a sacrificial erosion buffer to absorb impacts of factors including

climate change In common usage, climate change describes global warming—the ongoing increase in global average temperature—and its effects on Earth's climate system. Climate change in a broader sense also includes previous long-term changes to ...

, increased runoff from

urbanization Urbanization (or urbanisation) refers to the population shift from rural to urban areas, the corresponding decrease in the proportion of people living in rural areas, and the ways in which societies adapt to this change. It is predominantly t ...

, and increased boat wake without damaging structures located behind a setback zone.

Role in logging

The protection of riparian zones is often a consideration in logging operations. The undisturbed soil, soil cover, and vegetation provide shade, plant litter, and woody material, and reduce the delivery of soil eroded from the harvested area. Factors such as soil types and

root In vascular plants, the roots are the organs of a plant that are modified to provide anchorage for the plant and take in water and nutrients into the plant body, which allows plants to grow taller and faster. They are most often below the sur ...

structures, climatic conditions, and vegetative cover determine the effectiveness of riparian buffering. Activities associated with logging, such as sediment input, introduction or removal of species, and the input of polluted water all degrade riparian zones.

Vegetation

Willow Creek, Trout Creek Mountains, Oregon

The assortment of riparian zone trees varies from those of wetlands and typically consists of plants that are either emergent aquatic plants, or

herb In general use, herbs are a widely distributed and widespread group of plants, excluding vegetables and other plants consumed for macronutrients, with savory or aromatic properties that are used for flavoring and garnishing food, for medicina ...

tree In botany, a tree is a perennial plant with an elongated stem, or trunk, usually supporting branches and leaves. In some usages, the definition of a tree may be narrower, including only woody plants with secondary growth, plants that are ...

s and shrubs that thrive in proximity to water.

North America

Water's edge

Herbaceous Perennial: *'' Peltandra virginica'' – Arrow Arum *'' Sagittaria lancifolia'' – Arrowhead *'' Carex stricta'' – Tussock Sedge *'' Iris virginica'' – Southern Blue Flag Iris

Inundated riparian zone

Herbaceous Perennial: *''

Sagittaria latifolia ''Sagittaria latifolia'' is a plant found in shallow wetlands and is sometimes known as broadleaf arrowhead, duck-potato, Indian potato, katniss, or wapato. This plant produces edible tubers that have traditionally been extensively used by N ...

'' – Duck Potato *'' Schoenoplectus tabernaemontani'' – Softstem Bulrush *''

Scirpus americanus ''Schoenoplectus americanus'' ( syn. ''Scirpus americanus'') is a species of flowering plant in the sedge family known by the common names chairmaker's bulrush and Olney's three-square bulrush. It is native to the Americas, where it is known fro ...

'' – Three-square Bulrush *''

Eleocharis quadrangulata ''Eleocharis quadrangulata'' is a species of spikesedge known by the common names square-stem spikerush and four-angled spikerush. It is native to eastern and central North America (from Texas and Florida north to Ontario and Massachusetts), wit ...

'' – Square-stem Spikerush *''

Eleocharis obtusa ''Eleocharis obtusa'' is a species of spikesedge known by the common name blunt spikerush. This plant is widely distributed across Canada and the United States, where it grows in wet areas such as riverbanks and moist forest floors. It is also a ...

'' –

Spikerush ''Eleocharis'' is a virtually cosmopolitan genus of 250 or more species of flowering plants in the sedge family, Cyperaceae. The name is derived from the Greek words ἕλειος (''heleios''), meaning "marsh dweller," and χάρις (''chari ...

Western

In western North America and the Pacific coast, the riparian vegetation includes: Riparian trees *''

Sequoia sempervirens ''Sequoia sempervirens'' ()''Sunset Western Garden Book,'' 1995:606–607 is the sole living species of the genus '' Sequoia'' in the cypress family Cupressaceae (formerly treated in Taxodiaceae). Common names include coast redwood, coasta ...

'' – Coast Redwood *'' Thuja plicata'' – Western Redcedar *'' Abies grandis'' – Grand Fir *''

Picea sitchensis ''Picea sitchensis'', the Sitka spruce, is a large, coniferous, evergreen tree growing to almost tall, with a trunk diameter at breast height that can exceed 5 m (16 ft). It is by far the largest species of spruce and the fifth-larg ...

'' – Sitka Spruce *'' Chamaecyparis lawsoniana'' – Port Orford-cedar *'' Taxus brevifolia'' – Pacific Yew *'' Populus fremontii'' – Fremont Cottonwood *'' Populus trichocarpa'' – Black Cottonwood *''

Platanus racemosa ''Platanus racemosa'' is a species of plane tree known by several common names, including California sycamore, western sycamore, California plane tree, and in North American Spanish aliso. ''Platanus racemosa'' is native to California and Baja C ...

'' – California Sycamore *'' Alnus rhombifolia'' – White Alder *'' Alnus rubra'' – Red Alder *'' Acer macrophyllum'' – Big-leaf Maple *'' Fraxinus latifolia'' – Oregon ash *'' Prunus emarginata'' – Bitter Cherry *''

Salix lasiolepis ''Salix lasiolepis'' (arroyo willow) is a species of willow native to western North America. Distribution The core range of the arroyo willow includes most of California, including the California Coast Ranges, Arizona, Klamath Mountains, Peninsu ...

'' – Arroyo Willow *''

Salix lucida ''Salix lucida'', the shining willow, Pacific willow, red willow, or whiplash willow, is a species of willow native to northern and western North America, occurring in wetland habitats.Jepson Flora''Salix lucida''/ref>Plants of British Columbia'' ...

'' – Pacific Willow *''

Quercus agrifolia ''Quercus agrifolia'', the California live oak, or coast live oak, is a highly variable, often evergreen oak tree, a type of live oak, native to the California Floristic Province. It may be shrubby, depending on age and growing location, but is ...

'' – Coast live oak *''

Quercus garryana ''Quercus garryana'' is an oak tree species of the Pacific Northwest, with a range stretching from southern California to southwestern British Columbia. It is commonly known as the Oregon white oak or Oregon oak or, in Canada, the Garry oak. It ...

'' – Garry oak *'' Populus tremuloides'' – Quaking Aspen *'' Umbellularia californica'' – California Bay Laurel *''

Cornus nuttallii ''Cornus nuttallii'', the Pacific dogwood, western dogwood, or mountain dogwood, is a species of dogwood tree native to western North America. Description It is a small to medium-sized deciduous tree, reaching tall, often with a canopy sp ...

'' – Pacific Dogwood Riparian shrubs *'' Acer circinatum'' – Vine Maple *'' Ribes spp.'' – Gooseberies and Currants *''

Rosa pisocarpa ''Rosa pisocarpa'' is a species of rose known by the common name cluster rose or swamp rose. It is native to western North America from British Columbia to northern California, where it generally grows in moist habitats. It is a shrub sometimes f ...

'' – Swamp Rose or Cluster Rose *'' Symphoricarpos albus'' – Snowberry *''

Spiraea douglasii ''Spiraea douglasii'' is a species of flowering plant in the rose family native to western North America. Common names include hardhack, hardhack steeplebush, Douglas' spirea, douglasspirea, steeplebush, and rose spirea. Description ''Spiraea d ...

'' – Douglas spirea *'' Rubus spp.'' – Blackberries, Raspberries, Thimbleberry, Salmonberry *'' Rhododendron occidentale'' – Western Azalea *'' Oplopanax horridus'' – Devil's Club *''

Oemleria cerasiformis ''Oemleria cerasiformis'', a shrub commonly known as osoberry or Indian plum, is the sole species in genus ''Oemleria''. Native to the Pacific coast and ranges of North America, from British Columbia, Canada to Santa Barbara County, Cali ...

'' – Indian Plum, Osoberry *''

Lonicera involucrata ''Lonicera involucrata'', the bearberry honeysuckle, bracted honeysuckle, twinberry honeysuckle, Californian Honeysuckle, twin-berry, or black twinberry, is a species of honeysuckle native to northern and western North America. Distribution ...

'' – Twinberry *''

Cornus stolonifera ''Cornus sericea'', the red osier or red-osier dogwood, is a species of flowering plant in the family Cornaceae, native to much of North America. It has sometimes been considered a synonym of the Asian species ''Cornus alba''. Other names includ ...

'' – Red-osier Dogwood *'' Salix spp.'' – Willows Other plants *'' Polypodium'' – Polypody Ferns *'' Polystichum'' – Sword Ferns *'' Woodwardia'' – Giant Chain Ferns *'' Pteridium'' – Goldback Ferns *'' Dryopteris'' – Wood Ferns *''

Adiantum ''Adiantum'' (), the maidenhair fern, is a genus of about 250 species of ferns in the subfamily Vittarioideae of the family Pteridaceae, though some researchers place it in its own family, Adiantaceae. The genus name comes from Greek, meaning " ...

'' – Maidenhair Ferns *'' Carex spp.'' – Sedges *'' Juncus spp.'' – Rushes *''

Festuca californica ''Festuca californica'' is a species of grass known by the common name California fescue. This fescue species is native to the U.S. states of California and Oregon, where it is a member of many plant communities, including chaparral and oak wo ...

'' – California Fescue bunchgrass *'' Leymus condensatus'' – Giant Wildrye bunchgrass *'' Melica californica'' – California Melic bunchgrass *'' Mimulus spp.'' – Monkeyflower and varieties *'' Aquilegia spp.'' – Columbine

Asia

Asia Asia (, ) is one of the world's most notable geographical regions, which is either considered a continent in its own right or a subcontinent of Eurasia, which shares the continental landmass of Afro-Eurasia with Africa. Asia covers an ...

there are different types of riparian vegetation, but the interactions between hydrology and ecology are similar as occurs in other geographic areas. *'' Carex spp.'' – Sedges *'' Juncus spp.'' – Rushes

Australia

Typical riparian vegetation in temperate New South Wales, Australia include: *'' Acacia melanoxylon'' – Blackwood *'' Acacia pravissima'' – Ovens Wattle *''

Acacia rubida ''Acacia rubida'', commonly known as red stem wattle, red stemmed wattle or red leaved wattle, is a shrub belonging to the genus ''Acacia'' and the subgenus ''Phyllodineae'' that is native to parts of eastern Australia. Description The shrub o ...

'' – Red Stem Wattle *''

Bursaria lasiophylla ''Bursaria'' is a genus of eight species of flowering plants in the family Pittosporaceae and is endemic to Australia. They are shrubs or slender trees, often with spiny branches and have simple leaves, relatively small flowers with five sepals ...

'' – Blackthorn *'' Callistemon citrinus'' – Crimson Bottlebrush *''

Callistemon sieberi ''Melaleuca paludicola'', commonly known as river bottlebrush, is a plant in the myrtle family Myrtaceae, and is endemic to eastern Australia. (Some Australian state herbaria continue to use the names ''Callistemon sieberi'' or ''Callistemon pal ...

'' – River Bottlebrush *'' Casuarina cunninghamiana'' – River She-Oak *'' Eucalyptus bridgesiana'' – Apple Box *''

Eucalyptus camaldulensis ''Eucalyptus camaldulensis'', commonly known as the river red gum, is a tree that is endemic to Australia. It has smooth white or cream-coloured bark, lance-shaped or curved adult leaves, flower buds in groups of seven or nine, white flowers a ...

'' – River Red Gum *'' Eucalyptus melliodora'' – Yellow Box *''

Eucalyptus viminalis ''Eucalyptus viminalis'', commonly known as the manna gum, white gum or ribbon gum, is a species of small to very tall tree that is endemic to south-eastern Australia. It has smooth bark, sometimes with rough bark near the base, lance-shaped to ...

'' – Manna Gum *''

Kunzea ericoides ''Kunzea ericoides'', commonly known as kānuka, kanuka, white tea-tree or burgan, is a tree or shrub in the myrtle family, Myrtaceae and is endemic to New Zealand. It has white or pink flowers similar to those of '' Leptospermum'' and from its ...

'' – Burgan *''

Leptospermum obovatum ''Leptospermum obovatum'', commonly known as river teatree, is a species of shrub that is endemic to south-eastern continental Australia. It has egg-shaped or lance-shaped leaves that are narrower at the base, white flowers usually arranged sin ...

'' – River Tea-Tree *'' Melaleuca ericifolia'' – Swamp Paperbark

Central Europe

Typical riparian zone trees in

Central Europe Central Europe is an area of Europe between Western Europe and Eastern Europe, based on a common historical, social and cultural identity. The Thirty Years' War (1618–1648) between Catholicism and Protestantism significantly shaped the ...

include: *'' Acer campestre'' – Field Maple *'' Acer pseudoplatanus'' – Sycamore Maple *''

Alnus glutinosa ''Alnus glutinosa'', the common alder, black alder, European alder, European black alder, or just alder, is a species of tree in the family Betulaceae, native to most of Europe, southwest Asia and northern Africa. It thrives in wet locations ...

'' – Black Alder *''

Carpinus betulus ''Carpinus betulus'', the European or common hornbeam, is a species of tree in the birch family Betulaceae, native to Western Asia and central, eastern, and southern Europe, including southern England. It requires a warm climate for good growth, ...

'' – European Hornbeam *''

Fraxinus excelsior ''Fraxinus excelsior'', known as the ash, or European ash or common ash to distinguish it from other types of ash, is a flowering plant species in the olive family Oleaceae. It is native throughout mainland Europe east to the Caucasus and Albo ...

'' – European Ash *'' Juglans regia'' – Persian Walnut *'' Malus sylvestris'' – European Wild Apple *'' Populus alba'' – White Poplar *'' Populus nigra'' – Black Poplar *''

Quercus robur ''Quercus robur'', commonly known as common oak, pedunculate oak, European oak or English oak, is a species of flowering plant in the beech and oak family, Fagaceae. It is a large tree, native to most of Europe west of the Caucasus. It is wid ...

'' – Pedunculate Oak *''

Salix alba ''Salix alba'', the white willow, is a species of willow native to Europe and western and central Asia.Meikle, R. D. (1984). ''Willows and Poplars of Great Britain and Ireland''. BSBI Handbook No. 4. .Rushforth, K. (1999). ''Trees of Britain a ...

'' – White Willow *'' Salix fragilis'' – Crack Willow *'' Tilia cordata'' – Small-leaved Lime *'' Ulmus laevis'' – European White Elm *'' Ulmus minor'' – Field Elm

Repair and restoration

Land clearing followed by floods can quickly erode a riverbank, taking valuable grasses and soils downstream, and later allowing the sun to bake the land dry. Riparian zones can be restored through relocation (of man-made products), rehabilitation, and time. Natural Sequence Farming techniques have been used in the

Upper Hunter The Upper Hunter Shire is a local government area in the Upper Hunter Region of New South Wales, Australia. The Shire was formed in May 2004 from the Scone Shire and parts of Murrurundi and Merriwa shires. The Mayor of the Upper Hunter Shire ...

Valley of

New South Wales ) , nickname = , image_map = New South Wales in Australia.svg , map_caption = Location of New South Wales in AustraliaCoordinates: , subdivision_type = Country , subdivision_name = Australia , established_title = Before federation , es ...

, Australia, in an attempt to rapidly restore eroded farms to optimum productivity. The Natural Sequence Farming technique involves placing obstacles in the water's pathway to lessen the energy of a flood, and help the water to deposit soil and seep into the flood zone. Another technique is to quickly establish ecological succession by encouraging fast-growing plants such as "weeds" (

pioneer species Pioneer species are hardy species that are the first to colonize barren environments or previously biodiverse steady-state ecosystems that have been disrupted, such as by wildfire. Pioneer flora Some lichens grow on rocks without soil, ...

) to grow. These may spread along the watercourse and cause

environmental degradation Environmental degradation is the deterioration of the environment through depletion of resources such as quality of air, water and soil; the destruction of ecosystems; habitat destruction; the extinction of wildlife; and pollution. It is d ...

, but may stabilize the soil, place carbon into the ground, and protect the land from drying. The weeds will improve the streambeds so that trees and grasses can return, and later ideally replace the weeds. There are several other techniques used by government and non-government agencies to address riparian and streambed degradation, ranging from the installation of bed control structures such as log sills to the use of pin groynes or rock emplacement. File:Cottonwood Creek, BLM, Oregon, 1988.jpg, alt=A rocky, brown stream bank mostly bare of vegetation, with a few aspen trees in the background, Cottonwood Creek riparian area in southeastern

Oregon Oregon () is a state in the Pacific Northwest region of the Western United States. The Columbia River delineates much of Oregon's northern boundary with Washington, while the Snake River delineates much of its eastern boundary with Idah ...

before restoration, 1988 File:Cottonwood Creek, BLM, Oregon, 2000.jpg, alt=The same stream bank lined with short grasses, with more aspen trees in the background, Cottonwood Creek riparian area during recovery, 2000 File:Cottonwood Creek, BLM, Oregon, 2002.jpg, alt=The same stream bank lined with higher grasses that obscure most of the water, with a thicker aspen grove behind, Cottonwood Creek riparian area after restoration, 2002

References

External links

Dissertation on riparian vegetation of Chalakudy RiverNational Riparian Service Team, Bureau of Land ManagementRed River Basin Riparian ProjectRiparian Forest Buffers, Kansas State University
* {{DEFAULTSORT:Riparian Zone Terrestrial biomes Environmental conservation Hydrology Water streams Rivers Habitats Habitat Water and the environment Freshwater ecology