Even-Aged Forests Vs Uneven Aged Forests
Even-Aged Forests Vs Un-Even Aged Forests
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EVEN-AGED
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UNEVEN-AGED
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Advantages
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Disadvantages
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Advantages
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Disadvantages
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Allows almost complete control over stand establishment
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Supply of seed or seedlings must come from outside of the stand to be established, unless shelter wood or seed tree reproduction methods are employed
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Seed supply comes from the residual stand, ease and certainty of natural regeneration
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Control over stand establishment is difficult to achieve
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High levels of direct solar radiation
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Seedlings are highly exposed to the elements
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Regeneration is more sheltered from the elements
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Lower levels of direct solar radiation
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Less root competition in the regenerated stand
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Higher potential for damaging erosion to occur
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Lower potential for damaging erosion to occur
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More root competition in the residual stand
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Suitable for regenerating shade-intolerant tree species.
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Shade-tolerant species may be overly exposed
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Suitable for regenerating shade-tolerant tree species
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May not be suitable for regenerating shade-intolerant tree species
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Logging and administrative costs relatively low
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The forest is significantly changed after cutting
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The forest is not significantly changed after cutting
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High logging and administrative costs; low volumes
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Enables use of genetic improvements, when planted
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Usually less biologically diverse, particularly young stands
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Usually more biologically diverse
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Difficult to use genetic improvements
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Usually not as costly to invest in tending of small trees
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Less suitable for small ownerships
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More suitable for small ownerships
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Usually costly to invest in tending of small trees (on large ownerships)
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Relatively simple to achieve a balanced, sustained yield of forest products
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Income only at final harvest or thinning
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Growth capacity of site can be converted to revenue at short intervals
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Difficult to achieve a balanced, sustained yield of forest products
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More adaptable to reclamation of nonproductive sites
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Costly site preparation, including use of pesticides and heavy equipment, is usually necessary
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Site preparation is usually unnecessary
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Less adaptable to reclamation of nonproductive sites
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Uniform growth rates and tree size
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Usually less aesthetically pleasing, depending on species composition
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Usually more aesthetically pleasing
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Growth rates and tree size variable
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Higher risk of disease, insect problems, and wildfire
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Lower risk of disease, insect problems, and wildfire
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Naeem Javid Muhammad Hassani is working as Conservator of Forests in Balochistan Forest & Wildlife Department (BFWD). He is the CEO of Tech Urdu (techurdu.net) Forestrypedia (forestrypedia.com), All Pak Notifications (allpaknotifications.com), Essayspedia, etc & their YouTube Channels). He is an Environmentalist, Blogger, YouTuber, Developer & Vlogger.