Efforts to Improve Undergrowth in National Parks Increase Biodiversity

Uncategorized By Apr 16, 2023

National parks are taking measures to manage and improve undergrowth to maintain biodiversity and ecological balance. Undergrowth poses several challenges, including blocking sunlight and consuming nutrients, leading to decreased growth of essential species and increased wildfire risk. National parks use different methods to manage undergrowth, including prescribed fires, manual removal, and herbicide treatment. Managed undergrowth promotes increased biodiversity, reduces wildfire risk, and improves aesthetic appeal for visitors. The management of undergrowth does not harm wildlife populations, and herbicide treatments are subject to strict guidelines and regulatory approval. The improved management of undergrowth supports the growth of larger trees and maintains the natural ecosystem.

Efforts to Improve Undergrowth in National Parks Increase Biodiversity

One of the primary objectives of national parks is to conserve biodiversity. The National Park Service manages over 84 million acres of land, with a diverse range of flora and fauna. However, maintaining this biodiversity is not an easy feat. One significant challenge is the undergrowth in national parks. The excessive growth of underbrush, shrubs, and small trees can dramatically impact the species present in the park, leading to severe ecological disruptions. For this reason, national parks are taking various measures to improve undergrowth in the area.

Challenges of Undergrowth

Undergrowth, if left unchecked, can have harmful effects on the biodiversity of an area. Some of the challenges posed by undergrowth include:

  • Reduced sunlight – Undergrowth can block out sunlight required by plants and trees to grow, leading to the death of essential species.
  • Decreased nutrients – When there is too much undergrowth, it can consume the nutrients in soil intended for larger trees and plants, thereby preventing their growth.
  • Increased wildfire risk – Accumulated underbrush, shrubs, and small trees can contribute to the growth and spread of wildfires.

Efforts to Improve Undergrowth

National parks have implemented various measures to improve undergrowth in their parks. Generally, these actions depend on the specific threats faced by a park’s ecosystem. Some of the initiatives taken by parks include:

Prescribed Fire

Prescribed fire is a technique used by land managers to improve the health of natural ecosystems by removing excess vegetation. A prescribed fire involves a controlled burn of specific areas within national parks. These burns are carefully planned and carried out by professionals to reduce the risk of wildfires while also promoting healthy plant growth. The removal of excess material from undergrowth encourages new growth, particularly of species adapted to fire.

Manual Removal of Undergrowth

In some parks, physical removal of undergrowth is necessary to preserve sensitive ecosystems. For instance, invasive plants that are not adapted to the ecosystem can create imbalances that threaten native flora and fauna. In these cases, park personnel will remove and dispose of excess underbrush manually.

Herbicide Treatment

Herbicides are another tool used by national parks to improve undergrowth conditions. Herbicide treatment may be necessary to manage invasive species that threaten ecosystems within a park. The use of herbicides can be controversial but is considered a vital aspect of conservation by many land managers.

The Benefits of Improved Undergrowth

The positive effects of improving undergrowth in national parks include:

  • Increased biodiversity – Improved undergrowth influences the environment to be more suitable for a more significant variety of species, leading to greater biodiversity in a park.
  • Reduced wildfire risk – Managed undergrowth can decrease the risk of wildfires by preventing the accumulation of excess plant material that fuel fires.
  • Improved aesthetic appeal – Visitors to national parks are attracted to the natural beauty of the landscape. Maintained undergrowth helps the parks to maintain natural aesthetics, a crucial aspect of visitor satisfaction.

Frequently Asked Questions

Is removing undergrowth harmful to wildlife?

No, managed undergrowth does not harm wildlife populations. On the contrary, improved undergrowth promotes a more varied habitat benefiting different species.

Does the park close during a controlled burn?

Usually, parks remain open during controlled burns, provided they do not interfere with visitor safety. Visitors can expect to see park staff implementing the controlled burn under safe conditions.

Is herbicide treatment harmful to human health?

Herbicides used in national parks are applied by licensed professionals following strict guidelines to minimize the risk of damage to ecosystems and impairing human health. In addition, the use of herbicides is subject to extensive testing, and their applications must be approved by regulatory authorities.

Do more extensive undergrowth management practices, such as prescribed burns, harm trees?

No. In fact, improved undergrowth management leads to better tree growth since fires remove excess materials that consume nutrients and sunlight essential for trees.


The undergrowth in national parks is crucial to environmental balance, affecting the quality of the natural habitat for plant and animal species. National parks have taken several steps to improve undergrowth conditions, including pruning, controlled burning, and herbicide treatment. By maintaining optimal undergrowth levels, parks encourage maximum biodiversity and support ecosystems, promoting healthy growth and minimizing wildfire risks.