A Hidden Network
Beneath the forest floors of our coastal forests lies a vast, mostly invisible network. Mycelium, the intricate web of thread-like fungal filaments, spreads through the soil, leaf litter, and decaying wood, connecting fungi with the wider forest ecosystem. Mycorrhizal fungi help trees access water and essential nutrients, while receiving sugars produced through photosynthesis in return. These underground networks play a vital role in nutrient cycling, soil health, and the interconnected web of life that sustains our coastal forests.
The Mycorrhizal Partnership
A mycorrhizal relationship is a mutually beneficial association between fungi and plant roots. In our coastal forests, many trees, including Douglas-fir, western red cedar, and western hemlock, form these partnerships with fungi in the soil. These underground partnerships play an important role in forest ecosystems, helping trees access nutrients, absorb water, and cope with certain environmental stresses, particularly in nutrient-poor soils.
Nutrient Cycling in Coastal Forests
Mycelium plays a vital role in nutrient cycling within coastal forests. Fungi break down organic matter, including fallen leaves, needles, and dead wood, gradually releasing nutrients back into the soil where they can be reused by trees and other plants. This natural recycling process is especially important in forest ecosystems, where nutrients are continually tied up in organic matter. By helping break down and recycle these materials, fungi support soil health, tree growth, and forest regeneration.
Fungi & Forest Health
Fungi play a vital role in forest health, supporting tree growth and helping trees cope with environmental stress. Some fungi, such as Trichoderma, can suppress certain plant pathogens, while mycorrhizal fungi like Amanita muscaria and Laccaria form partnerships with tree roots, helping them absorb water and essential nutrients. These partnerships can also help protect fine roots and improve a tree’s ability to cope with drought and other environmental challenges.
Fungi as Ecosystem Engineers
Beyond their partnerships with trees, fungi help shape the entire forest ecosystem. Their fruiting bodies, or mushrooms, provide an important food source for wildlife, including squirrels, mice, voles, and deer. Some animals also help disperse fungal spores, allowing fungi to spread and establish in new areas. Fungi break down dead wood and other organic matter, recycle nutrients, and create habitats for insects and other microorganisms. Some species can even break down certain environmental pollutants. Through these interconnected roles, fungi influence soil health, plant diversity, and forest regeneration.
Protecting the Fungal Web
Human induced and natural disturbances can disrupt the fungal networks that help sustain Coastal BC’s forests. Here are a few simple ways to support soil health in our own gardens and local parks. Reducing soil disturbance, avoiding unnecessary tilling, and limiting the use of herbicides and synthetic fertilizers can help protect fungi. Adding organic materials like wood chips and fallen leaves provides fungi a natural food source as they break down and recycle nutrients. Even something as simple as leaving fallen logs and dead wood in place (where safe and practical) can provide valuable habitat for fungi and other organisms.
Photos by @jrrtj