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Forest Thinning: Methods, Types, and Benefits for Healthy Woodlands

Author libre libre
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Beyond the regeneration felling associated with final harvesting, there are other types of cutting that do not aim at regeneration at all. Among these are improvement felling in forests.

forest

Why not just take whatever grows?

One option is to leave everything to nature: let the trees grow quietly, develop, and when they have matured we simply come and cut them down — taking whatever happens to grow. This is exactly what happens in sparsely populated, hard-to-reach areas. Sometimes such forest is extremely difficult to approach, perhaps only by helicopter, and a helicopter cannot carry away much timber.

Applying the principle of "take whatever grows" in easily accessible places served by good roads, however, is a wasteful way to treat a shared resource. What we need is not whatever happens to grow, but what we actually require — trees of the highest quality.

What are the goals of improvement felling?

The goals of improvement felling are to intervene sensibly in the life of the forest and draw additional benefit from it rather than letting growth take an uncontrolled course. It is well known that in early youth 90–95 percent of the total number of trees die off. Why not take them while they are still alive, before they dry out and rot? The benefits of improvement felling are considerable:

  • additional timber;
  • removing poorly growing trees frees up space for well-growing ones;
  • clearing out suppressed and diseased trees improves the health of the stand.
Logging
Consider a growing pine. Where pine stands alongside hazel or linden, at the age of 6–7 years it is suppressed by the fast-growing hazel and dies off in large numbers. To save the pine, the hazel must be cut out. But when pine grows on its own, without admixtures, it grows splendidly and needs no special care — it is only necessary to remove diseased trees, or those broken by snow, in good time.

This is precisely an example of reasonable human intervention in the forest biogeocenosis. As a result, foresters obtain excellent oak and fine pine, rather than hazel or aspen. That is what improvement felling in forests means. Without it, a large number of trees sooner or later turn into deadwood and become afflicted by diseases and pests.

Moreover, such a forest is also dangerous in terms of fire. As the saying goes, a single spark is enough to set it ablaze. All these shortcomings are found in stands that are not managed by people — and there are a great many such forests.

Frequently Asked Questions

What is forest thinning?
Forest thinning is a type of intermediate cutting carried out to tend a forest stand rather than to regenerate it. It involves removing poorly growing, suppressed, diseased, or damaged trees so that high-quality trees have more space, light, and resources to develop into superior timber.
Why is forest thinning important?
Thinning is important because in early growth stages 90-95 percent of trees naturally die off. By removing weak or diseased trees while they are still usable, foresters gain extra timber, free space for healthy trees, and improve overall stand health, preventing decay, pests, and disease.
What are the benefits of forest thinning?
Forest thinning provides additional timber harvested from trees that would otherwise die, frees up space for vigorous trees to grow, and improves stand health by removing suppressed and diseased trees. The result is higher-quality timber such as fine oak and pine.
What are the pros and cons of forest thinning?
Pros include extra usable timber, healthier stands, and higher-quality trees. Cons include the cost and difficulty of access in remote areas, where harvesting may require helicopters and prove uneconomical. In easily accessible areas, skipping thinning is considered poor resource management.
How does thinning help young pine trees?
Young pine growing near fast-growing hazel or linden can be suppressed and die in large numbers around age 6-7. Cutting back the competing hazel rescues the pine. Where pine grows alone, little tending is needed beyond removing diseased or snow-broken trees.

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