Tree stump, about 37 years after felling

After a tree has been cut and felled, the stump or tree stump is usually a small remaining portion of the trunk with the roots still in the ground. Stumps may show the age-defining rings of a tree. The study of these rings is known as dendrochronology.

Stump sculpture by German artist Eberhard Bosslet

Regeneration

Stumps (both those on the ground and stumps of removed branches) are sometimes able to regenerate into new trees depending on the species. Often, a deciduous tree that has been cut will re-sprout in multiple places around the edge of the stump or from the roots.[1] Depending on whether the tree is being removed or whether the forest is expected to recover, this can be either desirable or undesirable. Stump sprouts can grow very quickly and so become viable trees themselves either for aesthetics or timber, due to the existing root structure; however, the cut portion of the trunk may weaken the sprouts and introduce disease into the newly forming tree(s).[2]

A freshly cut tree stump, 2 hours after cutting
A saprobiontic young spruce on a stump

The process of deliberately cutting a tree to a stump to regrow is known as coppicing.[3]

Stump removal

Tree stumps can be difficult to remove from the ground. They can be dug out, pulled out by a chain, shredded with a stump grinder or burnt.[4]

A common method for stump removal is to use one of the many chemical stump removal products, so long as immediate results are not needed. These stump removers are mostly made of potassium nitrate (KNO3) and act by rapidly increasing the decay of the stump. (The chemical provides nitrogen, a limiting nutrient, to tree-decaying fungi. Other nitrogen fertilizers also work.)[5] After an average of 4–6 weeks, the stump will be rotten through and easily fragmented in manageable pieces. If time is a limiting factor, setting fire to the stump is effective because once the potassium nitrate has been absorbed it acts as an effective oxidizer.

Historically, an explosive called stumping powder was used to blast stumps.[6][7]

Stump harvesting

In plantation forests in parts of Europe, stumps are sometimes pulled out of the ground using a specially adapted tracked excavator, to supply wood fuel for biomass power stations. Stump harvesting may provide an increasing component of the woody material required by the biomass power sector.[8]

See also

References

  1. ↑ J. & Götmark, F. (2014) Differential survival and growth of stumps in 14 woody species after conservation thinning in mixed oak-rich temperate forests. European Journal of Forest Research, 1-11.
  2. ↑ "Tree Wounds and Healing". Purdue Extension Forestry & Natural Resources. 2020-09-29. Retrieved 2023-10-20.
  3. ↑ Buckley, G.P.: Ecology and Management of Coppice Woodlands, 336 pages. Springer, 1992.
  4. ↑ "4 Ways to Remove Tree Stumps". wikiHow. Retrieved 2023-10-20.
  5. ↑ Stan Roark (February 27, 2008). "Stump Removal for Homeowners". Alabama Cooperative Extension System. Archived from the original on March 23, 2012.
  6. ↑ Fortier, Samuel (1916). Use of Water in Irrigation. McGraw-Hill book Company, Incorporated.
  7. ↑ Professional Tree Trimmers
  8. ↑ "Stump harvesting". Forest Research. Retrieved 2023-10-20.
  • Buckley, G.P. 1992. Ecology and Management of Coppice Woodlands. Springer 336 pages, ISBN 0-412-43110-6, ISBN 978-0-412-43110-4.
  • Schenk, H.J., and R.B. Jackson. 2002. The global biogeography of roots. Ecological Monographs 72 (3): 311–328.
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