Holdridge life zones: Difference between revisions
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{{More citations needed|date=December 2021}} |
{{More citations needed|date=December 2021}} |
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[[Image:Lifezones Pengo.svg|thumb|upright=2|Holdridge life zone classification scheme. Although conceived as three-dimensional by its originator, it is usually shown as a two-dimensional array of hexagons in a triangular frame.]] |
[[Image:Lifezones Pengo.svg|thumb|upright=2|Holdridge life zone classification scheme. Although conceived as three-dimensional by its originator, it is usually shown as a two-dimensional array of hexagons in a triangular frame.]] |
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The '''Holdridge life zones system''' is a global bioclimatic scheme for the classification of land areas. It was first published by [[Leslie Holdridge]] in 1947, and updated in 1967. It is a relatively simple system based on few empirical data, giving objective |
The '''Holdridge life zones system''' is a global bioclimatic scheme for the classification of land areas. It was first published by [[Leslie Holdridge]] in 1947, and updated in 1967. It is a relatively simple system based on few empirical data, giving objective criteria.<ref>{{Cite web|url=https://www.epa.gov/aboutepa/about-national-health-and-environmental-effects-research-laboratory-nheerl|archive-url=https://www.webcitation.org/6EN4ZYhX6?url=http://www.epa.gov/wed/pages/publications/abstracts/archived/lugo.htm|url-status=dead|title=About the National Health and Environmental Effects Research Laboratory (NHEERL)|first=OA|last=US EPA|date=January 29, 2013|archive-date=February 12, 2013|website=US EPA}}</ref> A basic assumption of the system is that both [[soil type|soil]] and the [[Climax community|climax vegetation]] can be mapped once the climate is known.<ref>{{Cite journal |title=Comments on the Application of the Holdridge System for Classification of World Life Zones as Applied to Costa Rica |author=Harris SA |journal=Arctic and Alpine Research |volume=5 |year=1973 |pages=A187–A191 |jstor=1550169 |issue=3 }}</ref> |
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==Scheme== |
==Scheme== |
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While it was first designed for tropical and subtropical areas, the system applies globally. The system has been shown to fit [[tropical]] vegetation zones, [[Mediterranean]] zones, and [[boreal ecosystem|boreal]] zones, but is less applicable to cold oceanic or cold arid climates where moisture becomes the |
While it was first designed for tropical and subtropical areas, the system now applies globally. The system has been shown to fit not just [[tropical]] vegetation zones,but [[Mediterranean]] zones, and [[boreal ecosystem|boreal]] zones too, but is less applicable to cold oceanic or cold arid climates where moisture becomes the predominant factor. The system has found a major use in assessing the potential changes in natural vegetation patterns due to [[global warming]].<ref>{{Cite web |url=http://www.ngdc.noaa.gov/ecosys/cdroms/ged_iia/datasets/a06/reprints/lh1.htm |title=Possible Changes in Natural Vegetation Patterns Due to a Global Warming |last=Leemans |first=Rik |year=1990 |publisher=National Geophysical Data Center (NOAA) |url-status=live |archive-url=https://web.archive.org/web/20091016000404/http://www.ngdc.noaa.gov/ecosys/cdroms/ged_iia/datasets/a06/reprints/lh1.htm |archive-date=2009-10-16 }}</ref> |
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The three axes of the [[barycentric subdivision]]s are: |
The three major axes of the [[barycentric subdivision]]s are: |
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* [[Precipitation (meteorology)|precipitation]] (annual, logarithmic) |
* [[Precipitation (meteorology)|precipitation]] (annual, logarithmic) |
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* |
* bio[[temperature]] (mean annual, logarithmic) |
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* [[potential evapotranspiration]] ratio (PET) to mean total annual precipitation. |
* [[potential evapotranspiration]] ratio (PET) to mean total annual [[precipitation]]. |
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Further indicators incorporated into the system are: |
Further indicators incorporated into the system are: |
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* [[Altitudinal zonation|altitudinal belts]] |
* [[Altitudinal zonation|altitudinal belts]] |
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Biotemperature is based on the growing season length and temperature. It is measured as the mean of all temperatures, with all temperatures below freezing and above 30 °C adjusted to 0 °C,<ref>{{cite journal|last1=Lugo|first1=A. E.|title=The Holdridge life zones of the conterminous United States in relation to ecosystem mapping|journal=Journal of Biogeography|date=1999|volume=26|issue=5|pages=1025–1038|url=https://www.researchgate.net/publication/227649905|access-date=27 May 2015|doi=10.1046/j.1365-2699.1999.00329.x|url-status=live|archive-url=https://web.archive.org/web/20150527185728/http://www.researchgate.net/profile/Herman_Shugart/publication/227649905_The_Holdridge_life_zones_of_the_conterminous_United_States_in_relation_to_ecosystem_mapping/links/00b49515b1408efd9c000000.pdf|archive-date=27 May 2015}}</ref> as plants are dormant at these temperatures. Holdridge's system uses biotemperature first, rather than the temperate latitude bias of [[Clinton Hart Merriam|Merriam]]'s life zones, and does not primarily consider elevation. The system is considered more appropriate |
Biotemperature is based on the growing season length and temperature. It is measured as the mean of all annual temperatures, with all temperatures below freezing and above 30 °C adjusted to 0 °C,<ref>{{cite journal|last1=Lugo|first1=A. E.|title=The Holdridge life zones of the conterminous United States in relation to ecosystem mapping|journal=Journal of Biogeography|date=1999|volume=26|issue=5|pages=1025–1038|url=https://www.researchgate.net/publication/227649905|access-date=27 May 2015|doi=10.1046/j.1365-2699.1999.00329.x|url-status=live|archive-url=https://web.archive.org/web/20150527185728/http://www.researchgate.net/profile/Herman_Shugart/publication/227649905_The_Holdridge_life_zones_of_the_conterminous_United_States_in_relation_to_ecosystem_mapping/links/00b49515b1408efd9c000000.pdf|archive-date=27 May 2015}}</ref> as most plants are dormant at these temperatures. Holdridge's system uses biotemperature first, rather than the temperate latitude bias of [[Clinton Hart Merriam|Merriam]]'s life zones, and does not primarily consider elevation directly. The system is considered more appropriate for [[tropical vegetation]] than Merriam's system. |
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== Scientific relationship between the 3 axes and 3 indicators == |
== Scientific relationship between the 3 axes and 3 indicators == |
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⚫ | [[Potential evapotranspiration]] (PET) is the amount of water that would be evaporated and transpired if there were enough [[water]] available. Higher temperatures result in higher PET<ref>{{Cite web |title=potential_evapotranspiration |url=https://esdac.jrc.ec.europa.eu/public_path/shared_folder/projects/DIS4ME/indicator_descriptions/potential_evapotranspiration.htm |access-date=2022-03-23 |website=esdac.jrc.ec.europa.eu}}</ref>. [[Evapotranspiration]] (ET) is the raw sum of evaporation and plant transpiration from the Earth's land surface to atmosphere. Evapotranspiration can never be greater than PET. The ratio, Precipitation/PET, is the [[aridity index]] (AI), with an AI<0.2 indicating [[Arid|arid/hyperarid]], and AI<0.5 indicating dry<ref>{{Cite web |url=http://agron-www.agron.iastate.edu/courses/Agron541/classes/541/lesson04a/4a.3.html |access-date=2022-03-23 |website=agron-www.agron.iastate.edu}}</ref>. |
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{{Unreferenced section|date=December 2021}} |
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⚫ | [[Potential evapotranspiration]] (PET) is the amount of water that would be evaporated and transpired if there were |
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Coldest |
Coldest |
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/\ |
/\ |
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/ \ |
/ \ |
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PET - -- - Rain |
PET - -- - Rain |
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The coldest regions have not much evapotranspiration nor precipitation, hence polar deserts. In the warmer regions, there are deserts with maximum PET but low rainfall that make the soil even drier, and rain forests with low PET and maximum rainfall causing [[river]] systems to drain excess water into oceans. |
The coldest regions have not much evapotranspiration nor precipitation as there is not enough heat to [[Evaporation|evaporate]] much water, hence [[Polar desert|polar deserts]]. In the warmer regions, there are deserts with maximum PET but low rainfall that make the soil even drier, and rain forests with low PET and maximum rainfall causing [[river]] systems to drain excess water into oceans. |
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== Classes == |
== Classes == |
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All the classes defined within the system, as used by the [[International Institute for Applied Systems Analysis]] (IIASA), are:<ref>{{Citation |last=Parry |first=M. L. |title=The effects on Holdridge Life Zones |date=1988 |url=http://pure.iiasa.ac.at/id/eprint/12961/ |pages=473–484 |place=Dordrecht, The Netherlands |publisher=Springer |isbn=978-94-009-2965-4 |access-date=2022-03-23 |last2=Carter |first2=T. R. |last3=Konijn |first3=N. T.}}</ref> |
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{{div col|colwidth=22em}} |
{{div col|colwidth=22em}} |
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# [[Polar desert]] |
# [[Polar desert]] |
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== References == |
== References == |
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{{Reflist}}<ref>{{Cite web |title=Holdridge's Life Zones - UNEP-WCMC |url=https://www.unep-wcmc.org/resources-and-data/holdridges-life-zones |access-date=2022-03-23 |website=UNEP-WCMC's official website - Holdridge's Life Zones}}</ref><ref>{{Citation |last=Parry |first=Martin L. |title=The Effects on Holdridge Life Zones |date=1988 |url=https://doi.org/10.1007/978-94-009-2965-4_22 |work=The Impact of Climatic Variations on Agriculture: Volume 2: Assessments in Semi-Arid Regions |pages=473–484 |editor-last=Parry |editor-first=Martin L. |place=Dordrecht |publisher=Springer Netherlands |language=en |doi=10.1007/978-94-009-2965-4_22 |isbn=978-94-009-2965-4 |access-date=2022-03-23 |last2=Carter |first2=Timothy R. |last3=Konijn |first3=Nicolaas T. |editor2-last=Carter |editor2-first=Timothy R. |editor3-last=Konijn |editor3-first=Nicolaas T.}}</ref><ref>{{Cite journal |last=Harris |first=Stuart A. |date=1973-08-01 |title=Comments on the Application of the Holdridge System for Classification of World Life Zones as Applied to Costa Rica |url=https://www.tandfonline.com/doi/abs/10.1080/00040851.1973.12003733 |journal=Arctic and Alpine Research |volume=5 |issue=sup3 |pages=A187–A191 |doi=10.1080/00040851.1973.12003733 |issn=0004-0851}}</ref><ref>{{Cite web |title=holdridge life zone: Topics by Science.gov |url=https://www.science.gov/topicpages/h/holdridge+life+zone |access-date=2022-03-23 |website=www.science.gov |language=en}}</ref> |
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{{Reflist}} |
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[[Category:Biogeographic realms]] |
[[Category:Biogeographic realms]] |
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[[Category:Sustainable building]] |
[[Category:Sustainable building]] |
Revision as of 10:23, 23 March 2022
This article needs additional citations for verification. (December 2021) |
The Holdridge life zones system is a global bioclimatic scheme for the classification of land areas. It was first published by Leslie Holdridge in 1947, and updated in 1967. It is a relatively simple system based on few empirical data, giving objective criteria.[1] A basic assumption of the system is that both soil and the climax vegetation can be mapped once the climate is known.[2]
Scheme
While it was first designed for tropical and subtropical areas, the system now applies globally. The system has been shown to fit not just tropical vegetation zones,but Mediterranean zones, and boreal zones too, but is less applicable to cold oceanic or cold arid climates where moisture becomes the predominant factor. The system has found a major use in assessing the potential changes in natural vegetation patterns due to global warming.[3]
The three major axes of the barycentric subdivisions are:
- precipitation (annual, logarithmic)
- biotemperature (mean annual, logarithmic)
- potential evapotranspiration ratio (PET) to mean total annual precipitation.
Further indicators incorporated into the system are:
- humidity provinces
- latitudinal regions
- altitudinal belts
Biotemperature is based on the growing season length and temperature. It is measured as the mean of all annual temperatures, with all temperatures below freezing and above 30 °C adjusted to 0 °C,[4] as most plants are dormant at these temperatures. Holdridge's system uses biotemperature first, rather than the temperate latitude bias of Merriam's life zones, and does not primarily consider elevation directly. The system is considered more appropriate for tropical vegetation than Merriam's system.
Scientific relationship between the 3 axes and 3 indicators
Potential evapotranspiration (PET) is the amount of water that would be evaporated and transpired if there were enough water available. Higher temperatures result in higher PET[5]. Evapotranspiration (ET) is the raw sum of evaporation and plant transpiration from the Earth's land surface to atmosphere. Evapotranspiration can never be greater than PET. The ratio, Precipitation/PET, is the aridity index (AI), with an AI<0.2 indicating arid/hyperarid, and AI<0.5 indicating dry[6].
Coldest /\ / \ PET - -- - Rain
The coldest regions have not much evapotranspiration nor precipitation as there is not enough heat to evaporate much water, hence polar deserts. In the warmer regions, there are deserts with maximum PET but low rainfall that make the soil even drier, and rain forests with low PET and maximum rainfall causing river systems to drain excess water into oceans.
Classes
All the classes defined within the system, as used by the International Institute for Applied Systems Analysis (IIASA), are:[7]
- Polar desert
- Subpolar dry tundra
- Subpolar moist tundra
- Subpolar wet tundra
- Subpolar rain tundra
- Boreal desert
- Boreal dry scrub
- Boreal moist forest
- Boreal wet forest
- Boreal rain forest
- Cool temperate desert
- Cool temperate desert scrub
- Cool temperate steppe
- Cool temperate moist forest
- Cool temperate wet forest
- Cool temperate rain forest
- Warm temperate desert
- Warm temperate desert scrub
- Warm temperate thorn scrub
- Warm temperate dry forest
- Warm temperate moist forest
- Warm temperate wet forest
- Warm temperate rain forest
- Subtropical desert
- Subtropical desert scrub
- Subtropical thorn woodland
- Subtropical dry forest
- Subtropical moist forest
- Subtropical wet forest
- Subtropical rain forest
- Tropical desert
- Tropical desert scrub
- Tropical thorn woodland
- Tropical very dry forest
- Tropical dry forest
- Tropical moist forest
- Tropical wet forest
- Tropical rain forest
See also
- Andrew Delmar Hopkins
- Biome
- Ecoregion
- Holdridge life zones in Guatemala
- Köppen climate classification
- Life zone
- Trewartha climate classification
References
- ^ US EPA, OA (January 29, 2013). "About the National Health and Environmental Effects Research Laboratory (NHEERL)". US EPA. Archived from the original on February 12, 2013.
- ^ Harris SA (1973). "Comments on the Application of the Holdridge System for Classification of World Life Zones as Applied to Costa Rica". Arctic and Alpine Research. 5 (3): A187–A191. JSTOR 1550169.
- ^ Leemans, Rik (1990). "Possible Changes in Natural Vegetation Patterns Due to a Global Warming". National Geophysical Data Center (NOAA). Archived from the original on 2009-10-16.
- ^ Lugo, A. E. (1999). "The Holdridge life zones of the conterminous United States in relation to ecosystem mapping". Journal of Biogeography. 26 (5): 1025–1038. doi:10.1046/j.1365-2699.1999.00329.x. Archived (PDF) from the original on 27 May 2015. Retrieved 27 May 2015.
- ^ "potential_evapotranspiration". esdac.jrc.ec.europa.eu. Retrieved 2022-03-23.
- ^ agron-www.agron.iastate.edu http://agron-www.agron.iastate.edu/courses/Agron541/classes/541/lesson04a/4a.3.html. Retrieved 2022-03-23.
{{cite web}}
: Missing or empty|title=
(help) - ^ Parry, M. L.; Carter, T. R.; Konijn, N. T. (1988), The effects on Holdridge Life Zones, Dordrecht, The Netherlands: Springer, pp. 473–484, ISBN 978-94-009-2965-4, retrieved 2022-03-23
- ^ "Holdridge's Life Zones - UNEP-WCMC". UNEP-WCMC's official website - Holdridge's Life Zones. Retrieved 2022-03-23.
- ^ Parry, Martin L.; Carter, Timothy R.; Konijn, Nicolaas T. (1988), Parry, Martin L.; Carter, Timothy R.; Konijn, Nicolaas T. (eds.), "The Effects on Holdridge Life Zones", The Impact of Climatic Variations on Agriculture: Volume 2: Assessments in Semi-Arid Regions, Dordrecht: Springer Netherlands, pp. 473–484, doi:10.1007/978-94-009-2965-4_22, ISBN 978-94-009-2965-4, retrieved 2022-03-23
- ^ Harris, Stuart A. (1973-08-01). "Comments on the Application of the Holdridge System for Classification of World Life Zones as Applied to Costa Rica". Arctic and Alpine Research. 5 (sup3): A187–A191. doi:10.1080/00040851.1973.12003733. ISSN 0004-0851.
- ^ "holdridge life zone: Topics by Science.gov". www.science.gov. Retrieved 2022-03-23.