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Monoculture

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(Redirected from Monoculture theory)
For the computing concept, see Monoculture (computer science). For the sociological concept, see Monoculturalism. For the popular culture concept, see Monoculture (popular culture).

Monocultural potato field

In agriculture, monoculture is the practice of growing one crop species in a field at a time.[1] Monoculture is widely used in intensive farming and in organic farming: both a 1,000-hectare cornfield and a 10-ha field of organic kale are monocultures. Monoculture of crops has allowed farmers to increase efficiency in planting, managing, and harvesting, mainly by facilitating the use of machinery in these operations, but monocultures can also increase the risk of diseases or pest outbreaks. This practice is particularly common in industrialized nations worldwide. Diversity can be added both in time, as with a crop rotation or sequence, or in space, with a polyculture or intercropping (see table below).

Continuous monoculture, or monocropping, where farmers raise the same species year after year, can lead to the quicker buildup and spread of pests and diseases in a susceptible crop.

The term "oligoculture" has been used to describe a crop rotation of just a few crops, as practiced in several regions of the world.[2]

The concept of monoculture can also extend to (for example) discussions of variety in urban landscapes.[3]

Agriculture

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Agricultural monocultures refer to the practice of planting one crop species in a field.[4] In crop monocultures, each plant in a field has the same standardized planting, maintenance, and harvesting requirements resulting in greater yields and lower costs. When a crop is matched to its well-managed environment, a monoculture can produce higher yields than a polyculture.[5] Modern practices such as monoculture planting and the use of synthesized fertilizers have reduced the amount of additional land needed to produce food,[6] called land sparing.

Diversity of crops in space and time; monocultures and polycultures, and rotations of both.[7]
Diversity in time
Low Higher
Cyclic Dynamic (non-cyclic)
Diversity in space Low Monoculture, one species in a field Continuous

monoculture,

monocropping

Crop rotation

(rotation of monocultures)

Sequence of monocultures
Higher Polyculture, two or more species

intermingled in a field (intercropping)

Continuous

polyculture

Rotation of polycultures Sequence of polycultures

Note that the distinction between monoculture and polyculture is not the same as between monocropping and intercropping. The first two describe diversity in space, as does intercropping. Monocropping and crop rotation describe diversity over time.

Environmental impacts
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Monocultures of perennials, such as African palm oil,[8] sugarcane,[9][10] tea[11][12] and pines,[13] can change soil chemistry leading to soil acidification, degradation, and soil-borne diseases, ultimately having a negative impact on agricultural productivity and sustainability.[9] The use of unregulated irrigation practices on popular monocultures, such as soy, can also lead to erosion and water loss.[14] As soil health declines, use of synthetic fertilizers on monocultural fields increases, often having negative implications on human health via chemical run-off.[14][15]

In addition to soil depletion, monocultures can cause significant reductions in biodiversity due to unavailability of resources, native species displacement, and loss of genetic variation.[16] Following large-scale oil palm plantations in Latin America, research has revealed extensive declines in mammal, bird, amphibian, and pollinator diversity, particularly in Colombia and Brazil.[17]

Due to insufficient biodiversity and population balance, monocultures are associated with higher rates of disease and pest outbreaks.[15][18] In response, pesticides are widely applied to agricultural fields, further harming insect and pollinator diversity[19] and human health.[16][20] Increasing rotations of crop monocultures or using alternatives agricultural practices can help mitigate the risk of disease and attack.[18]

Social impacts
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Environmental consequences of monocultural farming have notable social impacts, commonly concentrated to the reduction of small-scale farmers[16] and pesticide-related health issues.[14][20] Monoculture is contradictive to several primitive, more sustainable farming practices utilized by small-scale farmers.[16] Following pest outbreaks, over 600 million liters of pesticides are sprayed annually, contaminating nearby small-scale farming and causing communal health decline.[20] Research has revealed increased prevalence of pesticide-related disorders, diseases, and cancers affecting the human neurological, gastrointestinal, skin, and respiratory systems.[20]

Agro-extractivism

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Agro-extractivism is a form of extractivism in which foreign territorial, political, and economical dominance over agriculture is motivated by the large-scale production and exportation of agricultural commodities, often in the form of monocultures.[21]

Several monocultures in the Global South, such as sugar and coffee, were first planted in the 1800s following European colonization.[22] These plantations used slave labor,[23] setting a precedent for agriculture being a field dominated by foreign entities in the rest of Latin America and the Caribbean.[22] This social framework has shaped the oppression of Black people and smaller-scale farmers in the face of present-day land acquisition for monocultural use.[22]

Forestry

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In forestry, monoculture refers to plantations of one species of tree.[24] In many areas of the world, forest monocultures are planted as an efficient way to produce and harvest timber.[25] Because timber harvest from monoculture forests is often an export-driven industry, these plantations can be a form of extractivism.[26] Following deforestation, monoculture afforestation has become increasingly popular due to the necessity for ecosystem services, such as mitigating the effects of climate change via carbon sequestration and gas regulation.[25][26][27] Eucalyptus, pines, and acacias are examples of popular monocultures being utilized in the tropics and the Global South following rainforest deforestation.

Environmental impacts
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While forest monocultures are efficient ways of producing timber, studies show single-species forests reduce biodiversity, causing declines in forest productivity and native tree, animal, and insect populations over time.[25][27][17] The loss of biodiversity in forest monocultures is associated with lower forest resistance to pathogens, attack by insects,[28] and adverse environmental conditions.[29]

Social impacts
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Monoculture plantations have been shown to have substantial social impacts on local communities. Forest monocultures have motivated migrations across Latin America due to localized water cycle interference, declining soil health, and changes in resource availability.[25] While industrial agriculture can increase employment opportunities, studies show forest plantations often have limited employment opportunities, with most workers coming from outside of the community.[26] Profits made from monoculture plantations historically follow a "boom and bust" trend, temporarily benefitting the community in increased income, revenue, and quality of life until resources are exhausted, with profits rarely distributed back into the deforested land.[30]

Environmental changes caused by monoculture forests are particularly felt among indigenous communities given their reliance and connection to the land while additionally becoming subject to land privatization.[26] These lands are frequently acquired through land grabbing and dispossession by large companies in global trade, ultimately reducing rural land, cutting off access to locals, and changing agricultural and community dynamics.[31]

Residential monoculture

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Lawn monoculture in the United States was historically influenced by English gardens and manor-house landscapes, but its inception into the American landscape is fairly recent.[32] Aesthetics drove the evolution of the residential green areas, with turfgrass becoming a popular addition to many American homes. Turfgrass is a nonnative species and requires high levels of maintenance. At the local level, governments and organizations, such as Homeowner Associations, have pressured the maintenance of lawn aesthetics and influenced real estate value. Disagreements in residential maintenance of weeds and lawns have resulted in civil cases or direct aggression against neighbors.[32]

High levels of maintenance required for turfgrass created a growing demand for chemical management, i.e. pesticides, herbicides, insecticides. A 1999 study showed that in a sample of urban streams, at least one type of pesticide was found in 99% of the streams. A major risk associated with lawn pesticide use is the exposure to chemicals within the home through the air, clothing, and furniture, which can be more detrimental to children than to the average adult.[32]

Genetic monocultures

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While often referring to the production of the same crop species in a field (space), monoculture can also refer to the planting of a single cultivar across a larger regional area, such that there are numerous plants in the area with an identical genetic makeup to each other. When all plants in a region are genetically similar, a disease to which they have no resistance can destroy entire populations of crops. As of 2009 the wheat leaf rust fungus caused much concern internationally, having already severely affected wheat crops in Uganda and Kenya, and having started to spread in Asia as well.[33] Given the very genetically similar strains of much of the world's wheat crops following the Green Revolution, the impacts of such diseases threaten agricultural production worldwide.

Historic examples of genetic monocultures

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Great Famine of Ireland

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In Ireland, exclusive use of one variety of potato, the "lumper", led to the Great Famine of 1845–1849. Lumpers provided inexpensive food to feed the Irish masses. Potatoes were propagated vegetatively with little to no genetic variation. When Phytophthora infestans arrived in Ireland from the Americas in 1845, the lumper had no resistance to the disease, leading to the nearly complete failure of the potato crop across Ireland.

Bananas

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Until the 1950s, the Gros Michel cultivar of banana represented almost all bananas consumed in the United States because of their taste, small seeds, and efficiency to produce. Their small seeds, while more appealing than the large ones in other Asian cultivars, were not suitable for planting,[34]meaning all new banana plants had to be grown from the cut suckers of another plant. As a result of this asexual form of planting, all bananas grown had identical genetic makeups which gave them no traits for resistance to Fusarium wilt, a fungal disease that spread quickly throughout the Caribbean where they were being grown. By the beginning of the 1960s, growers had to switch to growing the Cavendish banana, a cultivar grown in a similar way. This cultivar is under similar disease stress since all the bananas are clones of each other and could easily succumb as the Gros Michel did.[35]

Cattle

[edit]
Aerial view of deforested area prepared for monoculture or cattle ranching, near Porto Velho in Rondônia, Brazil, in 2020

Genetic monoculture can also refer to a single breed of farm animal being raised in large-scale concentrated animal feeding operations (CAFOs). Many livestock production systems rely on just a small number of highly specialized breeds. Focusing heavily on a single trait (output) may come at the expense of other desirable traits – such as fertility, resistance to disease, vigor, and mothering instincts. In the early 1990s, a few Holstein calves were observed to grow poorly and died in the first 6 months of life. They were all found to be homozygous for a mutation in the gene that caused bovine leukocyte adhesion deficiency. This mutation was found at a high frequency in Holstein populations worldwide. (15% among bulls in the US, 10% in Germany, and 16% in Japan.) Researchers studying the pedigrees of affected and carrier animals tracked the source of the mutation to a single bull that was widely used in livestock production. In 1990 there were approximately 4 million Holstein cattle in the US, making the affected population around 600,000 animals.[36]

Benefits of genetic diversity

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Increasing genetic diversity through the introduction of organisms with varying genes can make agricultural and livestock systems more sustainable. By utilizing crops with varying genetic traits for disease and pest resistance, chances of disease outbreak decrease due to the likelihood of neighboring plants having strain-resistant genes.[37] This can aid in increasing crop productivity while decreasing pesticide usage.

Alternatives to monoculture

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Alternatives to monoculture include the consultation of agroecology,[38] silvo-pastoral systems,[19] and mixed-species plantations.[27]

Agroecology
[edit]

Agroecology consults the entire food system, considering how agricultural inputs and outputs affect social, environmental, and economic systems.[39] Despite the recent dominance of GMO monoculture crop rotations of soy, corn, and cotton across the deforested Amazon, many Afrodescendant-run farms in Brazil continue to use traditional practices of agroecology that have the capacity to sustain the local community, environment, and economy.[38] Ecosystem-specific ecological damage done by monocultural practices and byproducts, including the use of biocides and soil degradation, can be irreparable.[38] However, the increasing modern prevalence of regenerative farming reinstates crop rotation and natural nutrient cycling to repair biodiversity and improve soil productivity.[40]

Silvopasture
[edit]

Silvopasture is a traditional practice that incorporates the use of various trees and forage in pastures to increase land and livestock productivity.[41] Incorporating other plants in pastures, such as tree legumes, has been shown to enhance pollinator activity, benefitting local biodiversity and food security.[19] Silvopastoral systems provide greater pasture species richness and grazing feed, increasing economic and environmental outcomes on various size scales.[41]

Mixed-species plantations
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In several studies, well-managed mixed-species plantations have been shown to produce greater economic outcomes than monocultures with regard to timber sales.[25][27] Mixed-species forests are also associated with greater carbon sequestration and biodiversity, presenting a possible mitigation tactic against the climate crisis and current global carbon levels.[25][27] However, mixed-species plantations are less common under the misconception of being more expensive and harder to manage.[27]

See also

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References

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  1. ^ Pandey, D.K; Adhiguru, P; De, H K; Hazarikaa, B N (2021). "Permaculture to monoculture in shifting cultivation landscape of Mizoram, Northeast India: Are agrobiodiversity and happiness waning?" (PDF). Indian Journal of Traditional Knowledge. 20 (2): 479–485.
  2. ^ Compare: Denison, R. Ford (2012). Darwinian Agriculture: How Understanding Evolution Can Improve Agriculture. Princeton: Princeton University Press (published 2016). p. 3. ISBN 9780691173764. Regionally and globally, we practice oligoculture, relying mainly on only a few crops, particularly corn (maize), wheat, and rice.
  3. ^ For example: Gomez, Rafael; Isakov, Andre; Semansky, Matthew (2015). Small Business and the City: The Transformative Potential of Small Scale Entrepreneurship. Rotman-UTP Publishing. Toronto: University of Toronto Press. pp. 15–16. ISBN 9781442696518. [...] the idiosyncratic nature of what an urban main street can offer local residents stands in sharp contrast to the predictable monoculture of contemporary retail development.
  4. ^ Connor, David J.; Loomis, Robert S.; Cassman, Kenneth G. (28 April 2011). Crop Ecology: Productivity and Management in Agricultural Systems. Cambridge University Press. ISBN 978-1-139-50032-6.
  5. ^ Cardinale, Bradley J.; Matulich, Kristin L.; Hooper, David U.; Byrnes, Jarrett E.; Duffy, Emmett; Gamfeldt, Lars; Balvanera, Patricia; O’Connor, Mary I.; Gonzalez, Andrew (1 March 2011). "The functional role of producer diversity in ecosystems". American Journal of Botany. 98 (3): 572–592. doi:10.3732/ajb.1000364. hdl:2027.42/141994. ISSN 0002-9122. PMID 21613148. S2CID 10801536.
  6. ^ G. Tyler Miller; Scott Spoolman (24 September 2008). Living in the Environment: Principles, Connections, and Solutions. Cengage Learning. p. 279. ISBN 978-0-495-55671-8.
  7. ^ "Ecological Theories, Meta-Analysis, and the Benefits of Monocultures". Retrieved 18 September 2015.
  8. ^ Leech, Garry (2009). "The Oil Palm Industry: A Blight on Afro-Colombia". NACLA Report on the Americas. 42 (4): 30–34. doi:10.1080/10714839.2009.11725459. S2CID 157642907.
  9. ^ a b Tayyab, Muhammad; Yang, Ziqi; Zhang, Caifang; Islam, Waqar; Lin, Wenxiong; Zhang, Hua (26 April 2021). "Sugarcane monoculture drives microbial community composition, activity and abundance of agricultural-related microorganisms". Environmental Science and Pollution Research. 28 (35): 48080–48096. Bibcode:2021ESPR...2848080T. doi:10.1007/s11356-021-14033-y. ISSN 0944-1344. PMID 33904129. S2CID 233403664.
  10. ^ Correa-García, Esteban (Summer 2018). "Territorial transformations produced by the sugarcane agroindustry in the ethnic communities of López Adentro and El Tiple, Colombia". Land Use Policy. 76: 847–860. Bibcode:2018LUPol..76..847C. doi:10.1016/j.landusepol.2018.03.026. S2CID 51932235.
  11. ^ Arafat, Yasir; Ud Din, Israr; Tayyab, Muhammad; Jiang, Yuhang; Chen, Ting; Cai, Zhaoying; Zhao, Hanyu; Lin, Xiangmin; Lin, Wenxiong; Lin, Sheng (2020). "Soil Sickness in Aged Tea Plantation Is Associated With a Shift in Microbial Communities as a Result of Plant Polyphenol Accumulation in the Tea Gardens". Frontiers in Plant Science. 11: 601. doi:10.3389/fpls.2020.00601. ISSN 1664-462X. PMC 7270330. PMID 32547573.
  12. ^ Arafat, Yasir; Tayyab, Muhammad; Khan, Muhammad Umar; Chen, Ting; Amjad, Hira; Awais, Saadia; Lin, Xiangmin; Lin, Wenxiong; Lin, Sheng (August 2019). "Long-Term Monoculture Negatively Regulates Fungal Community Composition and Abundance of Tea Orchards". Agronomy. 9 (8): 466. doi:10.3390/agronomy9080466.
  13. ^ Cordero, Adolfo. "Large scale eucalypt plantations associated to increased fire risk". PeerJ Preprints. doi:10.7287/peerj.preprints.3348v1.
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  17. ^ a b Knowlton, Jessie L.; Mata Zayas, Ena E.; Ripley, Andres J.; Valenzuela-Cordova, Bertha; Collado-Torres, Ricardo (1 November 2019). "Mammal Diversity in Oil Palm Plantations and Forest Fragments in a Highly Modified Landscape in Southern Mexico". Frontiers in Forests and Global Change. 2. doi:10.3389/ffgc.2019.00067. ISSN 2624-893X.
  18. ^ a b Bullock, D. G. (January 1992). "Crop rotation". Critical Reviews in Plant Sciences. 11 (4): 309–326. Bibcode:1992CRvPS..11..309B. doi:10.1080/07352689209382349. ISSN 0735-2689.
  19. ^ a b c Narjes Sanchez, Manuel Ernesto; Cardoso Arango, Juan Andrés; Burkart, Stefan (22 September 2021). "Promoting Forage Legume–Pollinator Interactions: Integrating Crop Pollination Management, Native Beekeeping and Silvopastoral Systems in Tropical Latin America". Frontiers in Sustainable Food Systems. 5. doi:10.3389/fsufs.2021.725981. ISSN 2571-581X.
  20. ^ a b c d "The United Republic of Soybeans: take two". grain.org. Retrieved 24 November 2024.
  21. ^ Fernandes, Bernardo Mançano. "LAND GRABBING FOR AGRO-EXTRACTIVISM IN THE SECOND NEOLIBERAL PHASE IN BRAZIL/Estrangeirização da terra para o agroextrativismo na segunda fase neoliberal no Brasil/ El acaparamiento de tierras para el agro-extractivismo en la segunda fase neoliberal en Brasil". REVISTA NERA (in Portuguese) (50): 208–238. doi:10.47946/rnera.v0i50.6612. ISSN 1806-6755.
  22. ^ a b c Beckles, Hilary McD. (1991). "Review of Cuban Rural Society in the Nineteenth Century: The Social and Economic History of Monoculture in Matanzas., by L. W. Bergad". The Journal of Economic History. 51 (4): 982–984.
  23. ^ Veltmeyer, Henry; Ezquerro-Cañete, Arturo (29 July 2023). "Agro-extractivism". The Journal of Peasant Studies. 50 (5): 1673–1686. doi:10.1080/03066150.2023.2218802. ISSN 0306-6150.
  24. ^ Monoculture Forestry
  25. ^ a b c d e f Liu, Corsa Lok Ching; Kuchma, Oleksandra; Krutovsky, Konstantin V. (1 July 2018). "Mixed-species versus monocultures in plantation forestry: Development, benefits, ecosystem services and perspectives for the future". Global Ecology and Conservation. 15: e00419. Bibcode:2018GEcoC..1500419L. doi:10.1016/j.gecco.2018.e00419. ISSN 2351-9894.
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  27. ^ a b c d e f Pinnschmidt, Arne; Yousefpour, Rasoul; Nölte, Anja; Hanewinkel, Marc (1 September 2023). "Tropical mixed-species plantations can outperform monocultures in terms of carbon sequestration and economic return". Ecological Economics. 211: 107885. Bibcode:2023EcoEc.21107885P. doi:10.1016/j.ecolecon.2023.107885. ISSN 0921-8009.
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  33. ^ Vidal, John (19 March 2009). "'Stem rust' fungus threatens global wheat harvest". The Guardian. London. Retrieved 13 May 2010.
  34. ^ "Gros Michel". The banana knowledge platform of the ProMusa network. Retrieved 8 June 2019.
  35. ^ Schwarzacher, Trude; Heslop-Harrison, J. S. (1 October 2007). "Domestication, Genomics and the Future for Banana". Annals of Botany. 100 (5): 1073–1084. doi:10.1093/aob/mcm191. ISSN 0305-7364. PMC 2759213. PMID 17766312.
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  38. ^ a b c Salleh, Ariel (19 September 2023). "Extractivisms, existences, and extinctions: monoculture plantations and Amazon deforestationMarkus Kroger, Extractivisms, existences, and extinctions: monoculture plantations and Amazon deforestation . London: Routledge, 2022. US$160(Hardcover). ISBN 9780367610302: Markus Kroger, London: Routledge, 2022. US$160 (Hardcover). ISBN 9780367610302". The Journal of Peasant Studies. 50 (6): 2501–2504. doi:10.1080/03066150.2022.2137625. ISSN 0306-6150.
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  40. ^ Giller, Ken E; Hijbeek, Renske; Andersson, Jens A; Sumberg, James (2021). "Regenerative Agriculture: An agronomic perspective". Outlook on Agriculture. 50 (1): 13–25. doi:10.1177/0030727021998063. ISSN 0030-7270. PMC 8023280. PMID 33867585.
  41. ^ a b Jose, Shibu; Dollinger, Jeanne (1 February 2019). "Silvopasture: a sustainable livestock production system". Agroforestry Systems. 93 (1): 1–9. doi:10.1007/s10457-019-00366-8. ISSN 1572-9680.
[edit]
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