A secondary forest (or second-growth forest) is a forest or woodland area which has re-grown after a timber harvest or clearing for agriculture, until a long enough period has passed so that the effects of the disturbance are no longer evident. It is distinguished from an old-growth forest (primary or primeval forest), which has not recently undergone such disruption, and complex early seral forest, as well as third-growth forests that result from harvest in second growth forests. Secondary forest regrowing after timber harvest differs from forest regrowing after natural disturbances such as fire, insect infestation, or windthrow because the dead trees remain to provide nutrients, structure, and water retention after natural disturbances. However, often after natural disturbance the timber is harvested and removed from the system, in which case the system more closely resembles secondary forest rather than seral forest.
The forest in Stanley Park, Vancouver, British Columbia, Canada is generally considered to have second and third growth characteristics. This photo shows regeneration, a tree growing out of the stump of another tree that was felled in 1962 by the remnants of Typhoon Freda.
Depending on the forest, the development of primary characteristics may take anywhere from a century to several millennia. Hardwood forests of the eastern United States, for example, can develop primary characteristics in one or two generations of trees, or 150–500 years. Often the disruption is the result of human activity, such as logging, but natural phenomena that produce the same effect are often included in the definition. Secondary forests tend to have trees closer spaced than primary forests and contain less undergrowth than primary forests. Secondary forests typically were thought to lack biodiversity compared to primary forests,[1] however this has been challenged in recent years.[citation needed] Usually, secondary forests have only one canopy layer, whereas primary forests have several.
Secondary forestation is common in areas where forests have been lost by the slash-and-burn method, a component of some shifting cultivation systems of agriculture. Secondary forests may also arise from forest that has been harvested heavily or over a long period of time, forest that is naturally regenerating from fire and from abandoned pastures or areas of agriculture. It takes a secondary forest typically forty to 100 years to begin to resemble the original old-growth forest; however, in some cases a secondary forest will not succeed, due to erosion or soil nutrient loss in certain tropical forests.
Secondary forests re-establish by the process of succession. Openings created in the forest canopy allow sunlight to reach the forest floor. An area that has been cleared will first be colonized by pioneer species. Even though some species loss may occur with primary forest removal, a secondary forest can protect the watershed from further erosion and provides habitat. Secondary forests may also buffer edge effects around mature forest fragments and increase connectivity between them. They may also be a source of wood and other forest products.
Today most of the forests of the United States- especially in the eastern part of North America, as well as forests of Europe consist of secondary forest.
When forests are harvested, they either regenerate naturally or artificially (by planting and seeding select tree species). The result is a second growth forest which is less biodiverse than the old growth forest. In order to increase the biodiversity, it is possible to create low to moderate disturbances. Examples of these could be felling certain trees, damaging the tree trunks, and the creating small controlled burns. Low to moderate disturbances have been shown to be extremely beneficial to increase in biodiversity in secondary forests.[2] These secondary disturbances can clear the canopies to encourage lower canopy growth as well as provide habitats for small organisms such as insects, bacteria and fungi which may feed on the decaying plant material.
Rainforests
In the case of semi-tropical rainforests, where soil nutrient levels are characteristically low, the soil quality may be significantly diminished following the removal of primary forest. In Panama, growth of new forests from abandoned farmland exceeded loss of primary rainforest in 1990.[3] However, due to the diminished quality of soil, among other factors, the presence of a significant majority of primary forest species fail to recover in these second-growth forests.
^Chazdon, Robin L. (2008). "Beyond deforestation: restoring forests and ecosystem services on degraded lands" (PDF). Science. 320 (5882): 1458–1460. Bibcode:2008Sci...320.1458C. doi:10.1126/science.1155365. PMID 18556551. S2CID 206511664.
^Martin, Maxence; Morin, Hubert; Fenton, Nicole J. (2019-12-11). "Secondary disturbances of low and moderate severity drive the dynamics of eastern Canadian boreal old-growth forests". Annals of Forest Science. 76 (4): 108. doi:10.1007/s13595-019-0891-2. ISSN 1297-966X.
^"New Jungles Prompt a Debate on Rain Forests" article by Elisabeth Rosenthal in The New York Times January 29, 2009
References
CIFOR Secondary Forest
FAO Forestry
External links
M. van Breugel, 2007, Dynamics of secondary forests. PhD Thesis Wageningen University. ISBN978-90-8504-693-6
Uzay. U Sezen, 2007, Parentage analysis of a regenerating palm tree in a tropical second-growth forest. Ecological Society of America, Ecology 88: 3065-3075.
Rozendaal et al., 2019, Biodiversity recovery of Neotropical secondary forests Science Advances, 2019-03-06
January 30, 2023
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A secondary forest or second growth forest is a forest or woodland area which has re grown after a timber harvest or clearing for agriculture until a long enough period has passed so that the effects of the disturbance are no longer evident It is distinguished from an old growth forest primary or primeval forest which has not recently undergone such disruption and complex early seral forest as well as third growth forests that result from harvest in second growth forests Secondary forest regrowing after timber harvest differs from forest regrowing after natural disturbances such as fire insect infestation or windthrow because the dead trees remain to provide nutrients structure and water retention after natural disturbances However often after natural disturbance the timber is harvested and removed from the system in which case the system more closely resembles secondary forest rather than seral forest The forest in Stanley Park Vancouver British Columbia Canada is generally considered to have second and third growth characteristics This photo shows regeneration a tree growing out of the stump of another tree that was felled in 1962 by the remnants of Typhoon Freda Contents 1 Description 2 Rainforests 3 See also 4 Notes 5 References 6 External linksDescription EditDepending on the forest the development of primary characteristics may take anywhere from a century to several millennia Hardwood forests of the eastern United States for example can develop primary characteristics in one or two generations of trees or 150 500 years Often the disruption is the result of human activity such as logging but natural phenomena that produce the same effect are often included in the definition Secondary forests tend to have trees closer spaced than primary forests and contain less undergrowth than primary forests Secondary forests typically were thought to lack biodiversity compared to primary forests 1 however this has been challenged in recent years citation needed Usually secondary forests have only one canopy layer whereas primary forests have several Secondary forestation is common in areas where forests have been lost by the slash and burn method a component of some shifting cultivation systems of agriculture Secondary forests may also arise from forest that has been harvested heavily or over a long period of time forest that is naturally regenerating from fire and from abandoned pastures or areas of agriculture It takes a secondary forest typically forty to 100 years to begin to resemble the original old growth forest however in some cases a secondary forest will not succeed due to erosion or soil nutrient loss in certain tropical forests Secondary forests re establish by the process of succession Openings created in the forest canopy allow sunlight to reach the forest floor An area that has been cleared will first be colonized by pioneer species Even though some species loss may occur with primary forest removal a secondary forest can protect the watershed from further erosion and provides habitat Secondary forests may also buffer edge effects around mature forest fragments and increase connectivity between them They may also be a source of wood and other forest products Today most of the forests of the United States especially in the eastern part of North America as well as forests of Europe consist of secondary forest When forests are harvested they either regenerate naturally or artificially by planting and seeding select tree species The result is a second growth forest which is less biodiverse than the old growth forest In order to increase the biodiversity it is possible to create low to moderate disturbances Examples of these could be felling certain trees damaging the tree trunks and the creating small controlled burns Low to moderate disturbances have been shown to be extremely beneficial to increase in biodiversity in secondary forests 2 These secondary disturbances can clear the canopies to encourage lower canopy growth as well as provide habitats for small organisms such as insects bacteria and fungi which may feed on the decaying plant material Rainforests EditIn the case of semi tropical rainforests where soil nutrient levels are characteristically low the soil quality may be significantly diminished following the removal of primary forest In Panama growth of new forests from abandoned farmland exceeded loss of primary rainforest in 1990 3 However due to the diminished quality of soil among other factors the presence of a significant majority of primary forest species fail to recover in these second growth forests See also EditLand use land use change and forestry Land use OverloggingNotes Edit Chazdon Robin L 2008 Beyond deforestation restoring forests and ecosystem services on degraded lands PDF Science 320 5882 1458 1460 Bibcode 2008Sci 320 1458C doi 10 1126 science 1155365 PMID 18556551 S2CID 206511664 Martin Maxence Morin Hubert Fenton Nicole J 2019 12 11 Secondary disturbances of low and moderate severity drive the dynamics of eastern Canadian boreal old growth forests Annals of Forest Science 76 4 108 doi 10 1007 s13595 019 0891 2 ISSN 1297 966X New Jungles Prompt a Debate on Rain Forests article by Elisabeth Rosenthal in The New York Times January 29 2009References EditCIFOR Secondary Forest FAO Forestry World Resource InstituteExternal links EditM van Breugel 2007 Dynamics of secondary forests PhD Thesis Wageningen University ISBN 978 90 8504 693 6 Uzay U Sezen 2007 Parentage analysis of a regenerating palm tree in a tropical second growth forest Ecological Society of America Ecology 88 3065 3075 Rozendaal et al 2019 Biodiversity recovery of Neotropical secondary forests Science Advances 2019 03 06 Retrieved from https en wikipedia org w index php title Secondary forest amp oldid 1136120112, wikipedia, wiki, book, books, library,
