Agroforestry

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Maize grown under Faidherbia albida and Borassus akeassii near Banfora, Burkina Faso Faidherbia albida.JPG
Maize grown under Faidherbia albida and Borassus akeassii near Banfora, Burkina Faso

Agroforestry (also known as agro-sylviculture or forest farming) is a land use management system that integrates trees with crops or pasture. It combines agricultural and forestry technologies. As a polyculture system, an agroforestry system can produce timber and wood products, fruits, nuts, other edible plant products, edible mushrooms, medicinal plants, ornamental plants, animals and animal products, and other products from both domesticated and wild species. [1]

Contents

Agroforestry can be practiced for economic, environmental, and social benefits, and can be part of sustainable agriculture. [2] Apart from production, benefits from agroforestry include improved farm productivity, [3] healthier environments, reduction of risk for farmers, [4] beauty and aesthetics, increased farm profits, reduced soil erosion, creating wildlife habitat, less pollution, managing animal waste, increased biodiversity, improved soil structure, and carbon sequestration.

Agroforestry practices are especially prevalent in the tropics, especially in subsistence smallholdings areas, with particular importance in sub-Saharan Africa. Due to its multiple benefits, for instance in nutrient cycle benefits and potential for mitigating droughts, it has been adopted in the US and Europe.

Definition

At its most basic, agroforestry is any of various polyculture systems that intentionally integrate trees with crops or pasture on the same land. [5] [2] [6] An agroforestry system is intensively managed to optimize helpful interactions between the plants and animals included, and "uses the forest as a model fpractices". [7] The integration of tree species into farming systems initiates the development of an agroecological succession akin to natural vegetation. Hence, agroforestry is applied agroecology. [8]

Agroforestry shares principles with polyculture practices such as intercropping, but can also involve much more complex multi-strata agroforests containing hundreds of species. Agroforestry can also utilise nitrogen-fixing plants such as legumes to restore soil nitrogen fertility. Many farmers practicing agroforestry do not identify their land use as "agroforestry", signaling a need for greater education and awareness to increase adoption of these sustainable practices. [9]

History and scientific study

The term "agroforestry" was coined in 1973 by Canadian forester John Bene, but the concept includes agricultural practices that have existed for millennia. [10] Scientific agroforestry began in the 20th century with ethnobotanical studies carried out by anthropologists. However, indigenous communities that have lived in close relationships with forest ecosystems have practiced agroforestry informally for centuries. [11] For example, Indigenous peoples of California periodically burned oak and other habitats to maintain a 'pyrodiversity collecting model,' which allowed for improved tree health and habitat conditions. [12] Likewise Native Americans in the eastern United States extensively altered their environment and managed land as a "mosaic" of woodland areas, orchards, and forest gardens. [13]

Agroforestry in the tropics is ancient and widespread, notably in the form of "tropical home gardens." Some of those plots have been continuously cultivated for centuries. A "home garden" in Central America could contain 25 different species of trees and food crops on just one-tenth of an acre. [14] "Tropical home gardens" are traditional systems developed over time by growers without formalized research or institutional support, and are characterized by a high complexity and diversity of useful plants, with a canopy of tree and palm species that produce food, fuel, and shade, a mid-story of shrubs for fruit or spices, and an understory of root vegetables, medicinal herbs, beans, ornamental plants, and other non-woody crops. [15]

In 1929, J. Russel Smith published Tree Crops: A Permanent Agriculture, in which he argued that American agriculture should be changed two ways: by using non-arable land for tree agriculture, and by using tree-produced crops to replace the grain inputs in the diets of livestock. Smith wrote that the honey locust tree, a legume that produced pods that could be used as nutritious livestock feed, had great potential as a crop. The book's subtitle later led to the coining of the term permaculture . [16]

The most studied agroforestry practices involve a simple interaction between two components, such as simple configurations of hedges or trees integrated with a single crop. [17] There is significant variation in agroforestry systems and the benefits they have. [18] Agroforestry as understood by modern science is derived from traditional indigenous and local practices, developed by living in close association with ecosystems for many generations. [11]

Benefits

Benefits include increasing farm productivity and profitability, reduced soil erosion, creating wildlife habitat, managing animal waste, [19] increased biodiversity, improved soil structure, and carbon sequestration. [20]

Agroforestry systems can provide advantages over conventional agricultural and forest production methods. They can offer increased productivity; social, economic and environmental benefits, as well as greater diversity in the ecological goods and services provided. [21] These benefits are conditional on good farm management. This includes choosing the right trees, as well as pruning them regularly etc. [22]

Biodiversity

Agroforestry supports biodiversity in different ways. It provides a more diverse habitat than a conventional agricultural system in which the tree component creates ecological niches for a wide range of organisms both above and below ground. The life cycles and food chains associated with this diversification initiate an agroecological succession that creates functional agroecosystems that confer sustainability. Tropical bat and bird diversity, for instance, can be comparable to the diversity in natural forests. [23] Although agroforestry systems do not provide as many floristic species as forests and do not show the same canopy height, they do provide food and nesting possibilities. A further contribution to biodiversity is that the germplasm of sensitive species can be preserved. [24] As agroforests have no natural clear areas, habitats are more uniform. Furthermore, agroforests can serve as corridors between habitats. Agroforestry can help conserve biodiversity, positively influencing other ecosystem services. [24]

Soil and plant growth

Depleted soil can be protected from soil erosion by groundcover plants such as naturally growing grasses in agroforestry systems. These help to stabilise the soil as they increase cover compared to short-cycle cropping systems. [25] [26] Soil cover is a crucial factor in preventing erosion. [27] [28] Cleaner water through reduced nutrient and soil surface runoff can be a further advantage of agroforestry. Trees can help reduce water runoff by decreasing water flow and evaporation and thereby allowing for increased soil infiltration. [29] Compared to row-cropped fields nutrient uptake can be higher and reduce nutrient loss into streams. [30] [31]

Sustainability

Agroforestry systems can provide ecosystem services which can contribute to sustainable agriculture in the following ways:

According to the Food and Agriculture Organization's The State of the World's Forests 2020, adopting agroforestry and sustainable production practices, restoring the productivity of degraded agricultural lands, embracing healthier diets and reducing food loss and waste are all actions that urgently need to be scaled up. Agribusinesses must meet their commitments to deforestation-free commodity chains and companies that have not made zero-deforestation commitments should do so. [34]

Other environmental goals

Carbon sequestration is an important ecosystem service. [35] [24] [36] Agroforestry practices can increase carbon stocks in soil and woody biomass. [37] Trees in agroforestry systems, like in new forests, can recapture some of the carbon that was lost by cutting existing forests. They also provide additional food and products. The rotation age and the use of the resulting products are important factors controlling the amount of carbon sequestered. Agroforests can reduce pressure on primary forests by providing forest products. [38]

Adaptation to climate change

Agroforestry can significantly contribute to climate change mitigation along with adaptation benefits. [39] A case study in Kenya found that the adoption of agroforestry drove carbon storage and increased livelihoods simultaneously among small-scale farmers. In this case, maintaining the diversity of tree species, especially land use and farm size are important factors. [40]

Poor smallholder farmers have turned to agroforestry as a means to adapt to climate change. A study from the CGIAR research program on Climate Change, Agriculture and Food Security found from a survey of over 700 households in East Africa that at least 50% of those households had begun planting trees in a change from earlier practices. The trees were planted with fruit, tea, coffee, oil, fodder and medicinal products in addition to their usual harvest. Agroforestry was one of the most widespread adaptation strategies, along with the use of improved crop varieties and intercropping. [41]

Tropical

Trees in agroforestry systems can produce wood, fruits, nuts, and other useful products. Agroforestry practices are most prevalent in the tropics, [42] [43] especially in subsistence smallholdings areas [44] such as sub-Saharan Africa. [22] [45]

Research with the leguminous tree Faidherbia albida in Zambia showed maximum maize yields of 4.0 tonnes per hectare using fertilizer and inter-cropped with the trees at densities of 25 to 100 trees per hectare, [46] compared to average maize yields in Zimbabwe of 1.1 tonnes per hectare. [47]

Hillside systems

A well-studied agroforestry hillside system is the Quesungual Slash and Mulch Agroforestry System in Lempira Department, Honduras. This region was historically used for slash-and-burn subsistence agriculture. Due to heavy seasonal floods, the exposed soil was washed away, leaving infertile barren soil exposed to the dry season. [48] Farmed hillside sites had to be abandoned after a few years and new forest was burned. The UN's FAO helped introduce a system incorporating local knowledge consisting of the following steps: [49] [50]

  1. Thin and prune hillside secondary forest, leaving individual beneficial trees, especially nitrogen-fixing trees. They help reduce soil erosion, maintain soil moisture, provide shade and provide an input of nitrogen-rich organic matter in the form of litter.
  2. Plant maize in rows. This is a traditional local crop.
  3. Harvest from the dried plant and plant beans. The maize stalks provide an ideal structure for the climbing bean plants. Bean is a nitrogen-fixing plant and therefore helps introduce more nitrogen.
  4. Pumpkins can be planted during this time. The plant's large leaves and horizontal growth provide additional shade and moisture retention. It does not compete with the beans for sunlight since the latter grow vertically on the stalks.
  5. Every few seasons, rotate the crop by grazing cattle, allowing grass to grow and adding soil organic matter and nutrients (manure). The cattle prevent total reforestation by grazing around the trees.
  6. Repeat.

Kuojtakiloyan

The kuojtakiloyan of Mexico is a jungle-landscaped polyculture that grows avocadoes, sweet potatoes, cinnamon, black cherries, cuajiniquil  [ es ], citrus fruits, gourds, macadamia, mangoes, bananas and sapotes. [51]

Shade-grown coffee (Coffea arabica) in Sierra Norte of Puebla Cafe bajo sombra - 49465736457.jpg
Shade-grown coffee ( Coffea arabica ) in Sierra Norte of Puebla
Kuojtakiloyan Cafe bajo sombra.jpg
Kuojtakiloyan

Kuojtakiloyan is a Masehual term that means 'useful forest' or 'forest that produces', and it is an agroforestry system developed and maintained by indigenous peoples of the Sierra Norte of the State of Puebla, Mexico. It has become a vital fountain of resources (food, medicinal herbs, fuels, floriculture, etc.) for the local population, but it is also a respectful transformation of the environment, with its biodiversity and nature conservation. The kuojtakiloyan comes directly from the ancestral Nahua and Totonaku knowledge of their natural environment. [52]

The kuojtakiloyan is a jungle-landscaped polyculture in which avocados, sweet potatoes, cinnamon, black cherries, chalahuits, citrus fruits, gourds, macadamia, mangoes, bananas and sapotes are grown. [52] [53] In addition, a wide variety of harvested wild edible mushrooms and herbs ( quelites ). The jonote is planted because its fiber is useful in basketry, and also bamboo, which is fast growing, to build cabins and other structures. Concurrently to kuojtakiloyan, shade coffee is grown (café bajo sombra in Spanish; kafentaj in Masehual). Shade is essential to obtain high quality coffee. [54] The local population has favored the proliferation of the stingless bee (pisilnekemej) by including the plants that it pollinates. From bees, they get honey, pollen, wax and propolis. [52]

Shade crops

With shade applications, crops are purposely raised under tree canopies within the shady environment. The understory crops are shade tolerant or the overstory trees have fairly open canopies. A conspicuous example is shade-grown coffee. This practice reduces weeding costs and improves coffee quality and taste. [55] [56]

Alley cropping

With alley cropping, crop strips alternate with rows of closely spaced tree or hedge species. Normally, the trees are pruned before planting the crop. The cut leafy material - for example, from Alchornea cordifolia and Acioa barteri - is spread over the crop area to provide nutrients. The hedges serve as windbreaks and reduce erosion. [57] In tropical areas of North and South America, various species of Inga such as I. edulis and I. oerstediana have been used for alley cropping. [58] Weed control is inherent to the practice, providing mulch and shade. [57]

Syntropic systems

A temperate Syntropic system in Dordogne France, including heavily mulched sunflower plants Un luxuriant jardin syntropique en Dordogne.jpg
A temperate Syntropic system in Dordogne France, including heavily mulched sunflower plants

Syntropic farming, syntropic agriculture or syntropic agroforestry is an organic, permaculture agroforestry system developed by Ernst Götsch in Brazil. [59] [60] Sometimes this system is referred to as a successional agroforestry systems or SAFS, which sometimes refer to a broader concept originating in Latin America. [61] The system focuses on replicating natural systems of accumulation of nutrients in ecosystems, replicating secondary succession, in order to create productive forest ecosystems that produce food, ecosystem services and other forest products. [62]

The system relies on several processes:

The systems were first developed in tropical Brazil, but many similar systems have been tested in temperate environments as soil and ecosystem restoration tactics. [64]

The framework for the syntropic agroforestry is advocated for by Agenda Gotsch an organization built to promote the systems. [65]

Syntropic systems have a number of documented benefits, including increased soil water penetration, [66] increases to productivity on marginal land [67] and soil temperature moderation. [68]

In Burma

Taungya is a system from Burma. In the initial stages of an orchard or tree plantation, trees are small and widely spaced. The free space between the newly planted trees accommodates a seasonal crop, providing additional income. More complex taungyas use between-tree space for multiple crops. The crops become more shade tolerant as the tree canopies grow and the amount of sunlight reaching the ground declines. Thinning can maintain sunlight levels. [69]

In India

Itteri agroforestry systems have been used in Tamil Nadu since time immemorial. They involve the deliberate management of multipurpose trees and shrubs grown in intimate association with herbaceous species. They are often found along village and farm roads, small gullies, and field boundaries. [70]

Bamboo-based agroforestry systems (Dendrocalamus strictus + sesame–chickpea) have been studied for enhancing productivity in semi-arid tropics of central India. [71]

In Africa

A project to mitigate climate change with agriculture was launched in 2019 by the "Global EverGreening Alliance". The target is to sequester carbon from the atmosphere. By 2050 the restored land should sequestrate 20 billion tons of carbon annually. [72]

Shamba (Swahili for 'plantation') is an agroforestry system practiced in East Africa, particularly in Kenya. Under this system, various crops are combined: bananas, beans, yams and corn, to which are added timber resources, beekeeping, medicinal herbs, mushrooms, forest fruits, fodder for livestock, etc. [73]

In Hawaiʻi

Native Hawaiians formerly practiced agroforestry adapted to the islands' tropical landscape, using in particular breadfruit and coconut. Their ability to do this influenced the region's carrying capacity, social harmony, cooperation, and political complexity. [74] More recently, after scientific study of lo'I systems, attempts have been made to reintroduce dryland agroforestry in Hawaiʻi Island and Maui, fostering interdisciplinary collaboration between political leaders, landowners, and scientists. [75]

Temperate

Alley cropping corn fields between rows of walnut trees Alley cropping corn walnuts.jpg
Alley cropping corn fields between rows of walnut trees

Although originally a concept in tropical agronomy, [20] agroforestry's multiple benefits, for instance in nutrient cycles and potential for mitigating droughts, have led to its adoption in the US and Europe. [76] [77] [78]

The United States Department of Agriculture distinguishes five applications of agroforestry for temperate climates, namely alley cropping, forest farming, riparian forest buffers, silvopasture, and windbreaks. [20]

Alley cropping

Alley cropping can also be used in temperate climates. Strip cropping is similar to alley cropping in that trees alternate with crops. The difference is that, with alley cropping, the trees are in single rows. With strip cropping, the trees or shrubs are planted in wide strips. The purpose can be, as with alley cropping, to provide nutrients, in leaf form, to the crop. With strip cropping, the trees can have a purely productive role, providing fruits, nuts, etc. while, at the same time, protecting nearby crops from soil erosion and harmful winds. [20]

Forest farming

In forest farming, high-value crops are grown under a suitably-managed tree canopy. This is sometimes called multi-story cropping, or in tropical villages as home gardening. It can be practised at varying levels of intensity but always involves some degree of management; this distinguishes it from simple harvesting of wild plants from the forest. [20]

Riparian forest buffers

A riparian buffer bordering a river in Iowa Riparian buffer on Bear Creek in Story County, Iowa.JPG
A riparian buffer bordering a river in Iowa

Riparian buffers are strips of permanent vegetation located along or near active watercourses or in ditches where water runoff concentrates. The purpose is to keep nutrients and soil from contaminating the water. [20]

Silvopasture

Silvopasture over the years (Australia) Agrosylviculture australie Clive Wawn.jpg
Silvopasture over the years (Australia)

Trees can benefit fauna in a silvopasture system, where cattle, goats, or sheep browse on grasses grown under trees. [20] [79]

The dehesa or montado system of silviculture are an example of pigs and bulls being held extensively in Spain and Portugal. [80]

Windbreaks

Windbreaks reduce wind velocity over and around crops. This increases yields through reduced drying of the crop and/or by preventing the crop from toppling in strong wind gusts. [20]

In Switzerland

Since the 1950s, four-fifths of Swiss Hochstammobstgärten (traditional orchards with tall trees) have disappeared. An agroforestry scheme was tested here with hochstamm trees together with annual crops. Trees tested were walnut ( Juglans regia ) and cherry ( Prunus avium ). Forty to seventy trees per hectare were recommended, yields were somewhat decreasing with increasing tree height and foliage. [81] However, the total yield per area is shown to be up to 30 percent higher than for monocultural systems. [82]

Another set of tests involve growing Populus tremula for biofuel at 52 trees a hectare and with grazing pasture alternated every two to three years with maize or sorghum, wheat, strawberries and fallowing between rows of modern short-pruned & grafted apple cultivars ('Boskoop' & 'Spartan') and growing modern sour cherry cultivars ('Morina', 'Coraline' and 'Achat') and apples, with bushes in the rows with tree (dogrose, Cornus mas , Hippophae rhamnoides ) intercropped with various vegetables. [83]

Forest gardening

Robert Hart's forest garden in Shropshire Forestgarden2.jpg
Robert Hart's forest garden in Shropshire

Forest gardening is a low-maintenance, sustainable, [84] plant-based food production and agroforestry system based on woodland ecosystems, incorporating fruit and nut trees, shrubs, herbs, vines and perennial vegetables which have yields directly useful to humans. Making use of companion planting, these can be intermixed to grow in a succession of layers to build a woodland habitat. Forest gardening is a prehistoric method of securing food in tropical areas. In the 1980s, Robert Hart coined the term "forest gardening" after adapting the principles and applying them to temperate climates. [85]

History

Since prehistoric times, hunter-gatherers might have influenced forests, for instance in Europe by Mesolithic people bringing favored plants like hazel with them. [86] Forest gardens are probably the world's oldest form of land use and most resilient agroecosystem. [87] : 124  [88] First Nation villages in Alaska with forest gardens filled with nuts, stone fruit, berries, and herbs, were noted by an archeologist from the Smithsonian in the 1930s. [89]

Forest gardens are still common in the tropics and known as Kandyan forest gardens in Sri Lanka; [90] huertos familiares, family orchards in Mexico; [91] agroforests; or shrub gardens. They have been shown to be a significant source of income and food security for local populations. [92]

Robert Hart adapted forest gardening for the United Kingdom's temperate climate during the 1980s. [85]

In temperate climates

Robert Hart, forest gardening pioneer Robert Hart (horticulturist).jpg
Robert Hart, forest gardening pioneer

Hart began farming at Wenlock Edge in Shropshire to provide a healthy and therapeutic environment for himself and his brother Lacon. Starting as relatively conventional smallholders, Hart soon discovered that maintaining large annual vegetable beds, rearing livestock and taking care of an orchard were tasks beyond their strength. However, a small bed of perennial vegetables and herbs he planted was looking after itself with little intervention. [93]

Following Hart's adoption of a raw vegan diet for health and personal reasons, he replaced his farm animals with plants. The three main products from a forest garden are fruit, nuts and green leafy vegetables. [94] He created a model forest garden from a 0.12 acre (500 m2) orchard on his farm and intended naming his gardening method ecological horticulture or ecocultivation. [87] : 45  Hart later dropped these terms once he became aware that agroforestry and forest gardens were already being used to describe similar systems in other parts of the world. [87] : 28, 43  He was inspired by the forest farming methods of Toyohiko Kagawa and James Sholto Douglas, and the productivity of the Keralan home gardens; as Hart explained, "From the agroforestry point of view, perhaps the world's most advanced country is the Indian state of Kerala, which boasts no fewer than three and a half million forest gardens ... As an example of the extraordinary intensity of cultivation of some forest gardens, one plot of only 0.12 hectares (0.30 acres) was found by a study group to have twenty-three young coconut palms, twelve cloves, fifty-six bananas, and forty-nine pineapples, with thirty pepper vines trained up its trees. In addition, the smallholder grew fodder for his house-cow." [87] : 4–5 

Seven-layer system

The seven layers of the forest garden Forest garden 7 layers.gif
The seven layers of the forest garden

Further development

The Agroforestry Research Trust, managed by Martin Crawford, runs experimental forest gardening projects on a number of plots in Devon, United Kingdom. [96] Crawford describes a forest garden as a low-maintenance way of sustainably producing food and other household products. [97]

Ken Fern had the idea that for a successful temperate forest garden a wider range of edible shade tolerant plants would need to be used. To this end, Fern created the organisation Plants for a Future which compiled a plant database suitable for such a system. Fern used the term woodland gardening, rather than forest gardening, in his book Plants for a Future. [98] [99]

Kathleen Jannaway, the cofounder of Movement for Compassionate Living (MCL) with her husband Jack, [100] wrote a book outlining a sustainable vegan future called Abundant Living in the Coming Age of the Tree in 1991. The MCL promotes forest gardening and other types of vegan organic gardening. In 2009 it provided a grant of £1,000 to the Bangor Forest Garden project in Gwynedd, North West Wales. [101]

Permaculture

Bill Mollison, who coined the term permaculture , visited Hart at his forest garden in October 1990. [87] : 149  Permaculturalists such as Graham Bell, Patrick Whitefield, Dave Jacke, Eric Toensmeier and Geoff Lawton favour forest gardens. [102] Bell started building his forest garden in 1991 and wrote the book The Permaculture Garden in 1995, Whitefield wrote the book How to Make a Forest Garden in 2002, Jacke and Toensmeier co-authored the two volume book set Edible Forest Gardens in 2005, and Lawton presented the film Establishing a Food Forest in 2008. [103] [104] [105]

Geographical distribution

Forest gardens, or home gardens, are common in the tropics, using intercropping to cultivate trees, crops, and livestock on the same land. In Kerala in south India as well as in northeastern India, the home garden is the most common form of land use and is also found in Indonesia. One example combines coconut, black pepper, cocoa and pineapple. These gardens exemplify polyculture, and conserve much crop genetic diversity and heirloom plants that are not found in monocultures. Forest gardens have been loosely compared to the religious concept of the Garden of Eden. [106]

Americas

The Amazon rainforest, rather than being a pristine wilderness, has been shaped by humans for at least 11,000 years through practices such as forest gardening and terra preta . [107] Since the 1970s, numerous geoglyphs have been discovered on deforested land in the Amazon rainforest, furthering the evidence of pre-Columbian civilizations. [108] [109]

On the Yucatán Peninsula, much of the Maya food supply was grown in "orchard gardens", known as pet kot. [110] The system takes its name from the low wall of stones (pet meaning 'circular' and kot, 'wall of loose stones') that characteristically surrounds the gardens. [111]

The environmental historian William Cronon argued in his 1983 book Changes in the Land that indigenous North Americans used controlled burning to form ideal habitat for wild game. The natural environment of New England was sculpted into a mosaic of habitats. When indigenous Americans hunted, they were "harvesting a foodstuff which they had consciously been instrumental in creating". [112] Most English settlers, however, assumed that the wealth of food provided by the forest was a result of natural forces, and that indigenous people lived off "the unplanted bounties of nature." [113] Animal populations declined after settlement, while fields of strawberries and raspberries found by the earliest settlers became overgrown and disappeared for want of maintenance. [114]

Projects

El Pilar on the Belize–Guatemala border features a forest garden to demonstrate traditional Maya agricultural practices. [115] [116] A further one acre model forest garden, called Känan K'aax (meaning 'well-tended garden' in Mayan), is funded by the National Geographic Society and developed at Santa Familia Primary School in Cayo. [117]

In the United States, the largest known food forest on public land is believed to be the seven acre Beacon Food Forest in Seattle, Washington. [118] Other forest garden projects include those at the central Rocky Mountain Permaculture Institute in Basalt, Colorado, and Montview Neighborhood farm in Northampton, Massachusetts. [119] [120] The Boston Food Forest Coalition promotes local forest gardens. [121] [122] [123] [124]

In Canada, Richard Walker has been developing and maintaining food forests in British Columbia for over 30 years. He developed a three-acre food forest that at maturity provided raw materials for a plant nursery and herbal business as well as food for his family. [125] The Living Centre has developed various forest garden projects in Ontario. [126]

In the United Kingdom, other than those run by the Agroforestry Research Trust (ART), projects include the Bangor Forest Garden in Gwynedd, northwest Wales. [127] Martin Crawford from ART administers the Forest Garden Network, an informal network of people and organisations who are cultivating forest gardens. [128] [129]

Since 2014, Gisela Mir and Mark Biffen have been developing a small-scale edible forest garden in Cardedeu near Barcelona, Spain, for experimentation and demonstration. [130]

Forest farming

Forest farming is the cultivation of high-value specialty crops under a forest canopy that is intentionally modified or maintained to provide shade levels and habitat that favor growth and enhance production levels. Forest farming encompasses a range of cultivated systems from introducing plants into the understory of a timber stand to modifying forest stands to enhance the marketability and sustainable production of existing plants. [131]

Forest farming is a type of agroforestry practice characterized by the "four I's": intentional, integrated, intensive and interactive. [132]

Non-timber forest products are plants, parts of plants, fungi, and other biological materials harvested from within and on the edges of natural, manipulated, or disturbed forests. [133] Examples include ginseng, shiitake mushrooms, decorative ferns, and pine straw. [134]

History

Toyohiko Kagawa, forest farming pioneer KAGAWA Toyohiko young.JPG
Toyohiko Kagawa, forest farming pioneer

Forest farming has long been practiced around the world, as people have relied on fruits, nuts, seeds, and foliage from trees and shrubs to feed themselves and their livestock. [135]

In 1929, J. Russell Smith, emeritus Professor of Economic Geography at Columbia University, published "Tree Crops – A Permanent Agriculture" which stated that crop-yielding trees could provide useful substitutes for cereals in animal feeding programs, as well as conserve environmental health. [136] Toyohiko Kagawa read and was heavily influenced by Smith's publication and began experimental cultivation under trees in Japan during the 1930s. Through forest farming, or three-dimensional forestry, Kagawa addressed problems of soil erosion by persuading many of Japan's upland farmers to plant fodder trees to conserve soil, supply food and feed animals. He combined extensive plantings of walnut trees, harvested the nuts and fed them to the pigs, then sold the pigs as a source of income. When the walnut trees matured, they were sold for timber and more trees were planted so that there was a continuous cycle of economic cropping that provided both short-term and long-term income to the small landowner. [136] The success of these trials prompted similar research in other countries. World War II disrupted communication and slowed advances in forest farming. [136] In the mid-1950s research resumed in places such as southern Africa. Kagawa was also an inspiration to Robert Hart, who pioneered forest gardening in temperate climates in the sixties in Shropshire, England. [137]

Livestock was formerly often considered part of the forest farming system. Now animals are typically excluded and agroforestry systems that integrate trees, forages and livestock are referred to as silvopastures. [138] Because forest farming combines the ecological stability of natural forests with productive agriculture systems, it is considered to have great potential for regenerating soils, restoring ground water supplies, controlling floods and droughts, and cultivating marginal lands. [139]

Methods

Forest farming methods may include thinning of overstocked tree stands; integrated entries to accomplish thinning so that systemic shock is minimized; and interactive management to maintain a cross-section of healthy trees and shrubs of all ages and species. Physical disturbance to the surrounding area should be minimized. [140]

Further reading

See also

References

  1. ↑ Mudge, Ken; Gabriel, Steve (2014). Farming the Woods: an integrated permaculture approach to growing food and medicinals in temperate forests. White River Junction, VT: Chelsea Green Publishing. p. 9. ISBN   978-1-60358-507-1.
  2. 1 2 "What is agroforestry?". www.aftaweb.org. Retrieved 29 April 2018.
  3. ↑ Bizzo, Eduardo; Michener, Gregory (17 March 2024). "Fostering sustainable production via the Amazon Fund collaborative platform" . Sustainable Development. 32 (5): 5129–5143. doi:10.1002/sd.2956 – via CrossRef.
  4. ↑ MacDicken, Kenneth G.; Vergara, Napoleon T. (1990). Agroforestry: classification and management. John Wiley & Sons. p. 2. ISBN   0-471-83781-4.
  5. ↑ "Agroforestry". Food and Agriculture Organization. Archived from the original on 4 November 2022. Retrieved 26 February 2022.
  6. ↑ Leakey, R.R.B. (1996). Definition of agroforestry revisited, Agroforestry Today, 8(1), 5-7.
  7. ↑ Mudge, Ken; Gabriel, Steve (2014). Farming the Woods: an integrated permaculture approach to growing food and medicinals in temperate forests. Chelsea Green Publishing. p. 9. ISBN   978-1-60358-507-1.
  8. ↑ Leakey, R.R.B. 2014. The role of trees in agroecology and sustainable agriculture in the tropics. Annual Review of Phytopathology 52: 113-133.
  9. ↑ Santiago-Freijanes et al. 2021; Mosquera-Losada et al. 2020.
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