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Resilient Forests

Resilient Forests

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On this page:

How do we measure the health of a forest?
How can we improve forest health?

More about resilient forests:

Forest Management Planning
Forest Rules to Know
Wildfire management
Julie in Forest

Photo credit: Andy Bauer.

fire in forest
image of forest

Photo credit: Andy Bauer.

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Photo credit: OFRI.

Resilient Forests Priority Icon

Healthy, functioning forests are resilient against natural disturbances like insect pests, diseases, and fire.

In fact, these disturbances facilitate healthy biological processes such as decomposition, nutrient recycling, and creation of wildlife habitat. In a healthy forest, most trees can recover from a disturbance, but a forest that is stressed by overcrowding, tree wounding, soil compaction, or drought is more vulnerable to damage.

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How is forest health measured?

Forest Composition

Forest composition describes the mix of plants living in a forest. Healthy forests have a variety of native species that create an understoryThe layer of plants in a forest that exists under larger trees. and a canopyThe highest level of a forest. It is composed of tall trees and their branches.. When a forest is replanted with just a single species, it lacks the diversity it needs to stay resilient.

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    Weeds’ Effect On Forest Composition

    Weeds can negatively affect forest composition and harm trees and wildlife. Low species diversity caused by excessive weeds restricts wildlife’s access to food and shelter because they are not adapted to feed on weeds, many of which are invasive plants. Learn about common forest weeds.

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    Tree Vigor

    Tree vigor describes a tree’s overall health and growth. It considers several factors including leaf color, leaf volume, and tree growth. Combinations of multiple tree health problems worsen individual tree vigor as well as tree standA group of trees. vigor.

Four primary health problems can reduce tree vigor:

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    Insects

    Insects are an important part of forest ecosystems, but some can have harmful effects on tree health. Some insects attack the tree’s wood, while others target its leaves, affecting the tree’s ability to conduct photosynthesis.

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    Diseases

    Fungi are the primary cause of tree disease and can lead to rot, weakened roots, and loss of limbs. Diseases can also be caused by viruses and bacteria.

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    Abiotic factorsNon-living parts of the environment, like temperature, rain, and wind patterns.

    Abiotic factors include heatwaves, drought, unseasonal frost, and strong winds.

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    Physical damage

    Tree wounds, often caused by human activity, provide entry points for harmful insects and diseases.

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052021-TSWCD-HealthyForests@2x

How can we improve forest health?

Typical Forest Management Involves Practices Such As:

  • Removing smaller, weaker trees to reduce competition and increase the growing space for other trees.

  • Planting a variety of native trees and shrubs to increase biodiversity.

    Explore Native Plants
  • Removing weeds to give newly planted and young plants a better chance of surviving.

    Explore Invasive Species Management
  • Creating habitat to invite beneficial wildlife to the property which can produce health benefits across the entire watershed.

    Explore Creating Wildlife Habitat

Learn more about how we can help you create a healthier, more resilient forest.

More About Forest Health:

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WesternRedcedarDieback03_JoeyHulbert

Western Redcedar Trees Need Your Help

July 14, 2021
Understory Diversity

Laminated Root Rot: The Inconspicuous Tree Disease

September 11, 2020
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Tualatin Soil and Water
Conservation District
7175 NE Evergreen Pkwy #400
Hillsboro, OR. 97124

Phone: 503-334-2288
Office Hours: 8:00am - 4:30pm
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