Finding the Mother Tree | Suzanne Simard

Summary of: Finding the Mother Tree: Discovering the Wisdom of the Forest
By: Suzanne Simard


Embark on a captivating journey through the enthralling world of forests and learn how trees are connected in intricate, life-giving ways in Suzanne Simard’s Finding the Mother Tree: Discovering the Wisdom of the Forest. Through her rich narrative, Simard uncovers the dynamic ties between trees, fungi, and other species to reveal the complex cooperation and communication that occurs beneath our feet. Explore the concept of the ‘wood-wide web’ and the roles of so-called ‘Mother Trees’ in fostering a thriving, interconnected woodland ecosystem. The summary provides an engrossing introduction to the symbiotic networks that populate the underground world of the forest, the implications for modern forestry, and the fascinating personal journey of the author as she unveils the secrets of the forest.

The Mycelium Mystery

Deep in the misty forest, Suzanne discovers trees with glowing yellow roots and subterranean networks of colorful mycelium. Oddly, the recently reforested clear-cut area holds barely alive seedlings lacking these vibrant fungal connections. Intrigued, she wonders if this seemingly unnatural phenomenon offers a valuable insight into the dying seedlings’ problem and a potential solution for future reforestation endeavors.

Wandering through the fog-enshrouded forest, Suzanne admired the damp firs as they shimmered in the afternoon light. Her journey took her to a clear-cut, where new seedlings had been planted as part of her logging company’s reforestation efforts. Along the way, she noticed a Suillus mushroom, plucking it from the earth to reveal fine yellow mycelium threads beneath the surface.

On the way to the clear-cut, Suzanne’s foot slipped, and she fell, desperately clutching a small tree for balance. The young tree came out of the ground with her, and she noticed its roots covered by the same bright yellow mycelium as the mushroom. Digging deeper into the forest floor, she found a colorful network of fungal threads interwoven with the soil.

As Suzanne arrived at the clear-cut, she observed the stark contrast between the once-vibrant, ancient trees and the lifeless seedlings planted in evenly spaced rows. These new trees seemed to struggle for life, and closer examination revealed a distinct lack of the vibrant mycelium on their roots. Despite the well-executed planting process, the seedlings seemed unable to establish a connection with the soil.

Intrigued by the disparity, Suzanne spotted a healthy fir that had sprouted on its own. This tree’s roots revealed the same bright yellow mycelium she’d discovered earlier. Suzanne found herself pondering the purpose of these threads, unsure if they posed a threat, provided assistance, or had an altogether neutral effect on the trees’ growth.

As she concluded her assessment, Suzanne realized that the plantation was a failure. The logging company faced a tough decision: risk replanting the seedlings using the same methods and hope for a better outcome or find a new solution altogether. Knowing that the same approach might end in disappointment, Suzanne couldn’t help but wonder if the mysterious mycelial connections she’d stumbled upon held the key to reviving the struggling seedlings and ensuring future reforestation success.

Unveiling Nature’s Cooperation

As Suzanne watches her brother Kelly’s courageous bull-riding performance, she’s reminded of a deep connection with him, much like the symbiosis she later discovers between truffles and trees. This newfound understanding of cooperative relationships in nature challenges her perspective on the modern forestry industry, leading her to question the mystery surrounding her company’s dying seedlings.

Suzanne took in the sight of her brother Kelly atop a bull, wearing his cowboy hat and leather chaps, ready for the rodeo challenge. As the gate swung open, the raging bull – and Kelly – faced the eight-second test that could bring them prize money. Despite Suzanne’s enthusiastic support, Kelly was thrown off the bull at the seventh second, dislocating his shoulder.

Despite their initial disappointment, Kelly and Suzanne found comfort in a heartwarming conversation that helped mend their strained bond, reminding them of simpler times before their family fell apart. Even with pain and no prize at stake, their connection brought them closer.

Later, as Suzanne headed home, she noticed a squirrel feasting on a truffle found from the ground of a nearby fir tree. This scene piqued her curiosity, so she dug into the soil and discovered that the truffle shared a symbiotic relationship with the tree, as they were bound together by mycelium.

The implication was profound: the truffle and the tree engaged in a mutually beneficial relationship, with the fir thriving and the fungus bearing fruit. The intricate bond meant that any nutrients or water had to pass through the fungus to reach the tree, inspiring Suzanne to question if this cooperation was essential for their survival.

As she sought answers, Suzanne came across the term ‘mycorrhizal fungi’ in a library book. The mycorrhizal fungus was described as a life-or-death relationship between a plant and a fungus that could not exist without each other. The plant provided the fungus with sugars to grow more mycelium, while the fungus fetched water and nutrients from deeper parts of the soil, delivering them to the plant in exchange.

Realizing the importance of cooperation in nature, Suzanne confronted her assumptions about the modern forestry industry, which primarily focused on competitive relationships among forest species. Could these cooperative relationships, like that of mycorrhizal fungi, be the answer to the mystery of her company’s dying seedlings? This revelation sparked a renewed desire to understand and embrace the hidden bonds within the natural world.

Unraveling the Free-to-Grow Policy

Suzanne, a conflicted worker in the logging industry, collaborates with researcher Alan Vyse to investigate the government’s “free-to-grow” policy. The policy involves applying herbicides to clear-cuts to promote the growth of conifer seedlings by eliminating competing native plants. Suzanne’s experiment compares the effects of varying levels of herbicides on plant survival and growth, ultimately proving that a high dose of poison was effective in killing competing plants but leaving open questions about the seedlings’ long-term prospects.

As Suzanne and her colleague Ray wrapped pink ribbons around the ancient trees of the clear-cut, she couldn’t help but feel a deep pang of guilt. Although it was her job, participating in the destruction of these 500-year-old trees was a painful endeavor. Following a brief layoff, Suzanne’s passion for the forest drove her to explore a different path within the industry.

Soon, she found herself working with Alan Vyse, a British Columbia Forest Service researcher interested in the effects of weeding practices on high-elevation clear-cuts. Eager to gain experience in research, Suzanne helped design an experiment to evaluate the government’s “free-to-grow” policy—a practice that aimed to promote conifer seedling growth by wiping out entire native plant populations using herbicides, with Roundup being the most popular choice. This policy framed forests as mere tree farms, ignoring the complex ecosystems they encompass.

Suzanne recognized the contradiction of her stance, given her previous work in the logging industry, and her newfound role as a plant executioner in the experiment. However, she believed that understanding the policy’s impact on the environment could provide her with the necessary foundation to pursue her true passion: uncovering the mysterious deaths of seedlings in clear-cuts.

Upon arrival at the designated clear-cut site, Suzanne and her sister Robyn, who had volunteered to help, observed the thriving native plant life that would soon be targeted by herbicides. Under Alan’s guidance, they designed an experiment to test varying herbicide concentrations—specifically, using one, three, or six liters—on spruce plants. Additionally, they included a manually weeded plot with no herbicides and an untouched control plot for comparison. By repeating each treatment ten times, they sought to confirm their results conclusively.

Ultimately, the results were disheartening. As suspected, the maximum herbicide dose was most effective in killing the competing plants, leaving only the spruce seedlings behind. Although the experiment demonstrated the potency of herbicides and the efficacy of the “free-to-grow” policy in the short term, Alan reminded Suzanne that their findings did not provide insight into the seedlings’ long-term survival or the ecological sustainability of such practices. To unravel this mystery, a more comprehensive experiment was needed, propelling Suzanne further into her quest for understanding.

Unraveling Forests’ Mysteries

Suzanne, a silviculture researcher, found herself facing a conundrum when her experiment to investigate connections between conifer seedlings and fungi kept failing. The seedlings died persistently while surrounding grasses thrived. It occurred to her that seedlings might need specific mycorrhizal fungi to survive. She modified her experiment by adding old-growth forest soil, irradiated soil, and untreated soil, ultimately discovering that the seedlings thrived in the old-growth soil with many fungi. Eager to learn more about forests’ complex relationships, she decided to pursue further education.

Suzanne’s journey in the world of forestry research began when she secured a job with the Forest Service. This role allowed her to dive into critical questions and experiment with her theories on forests. She soon received a research grant to study the impact of mycorrhizal connections on the survival of conifer seedlings and explore their relationship with native plants.

Conducting the experiments proved to be quite challenging, and despite four years of effort and replanting, Suzanne found that the seedlings repeatedly perished. In contrast, the site’s lush grasses flourished, which led her to an intriguing realization. While Douglas fir and western larch trees relied on ectomycorrhizal fungi that coat root tips, grasses partnered with arbuscular mycorrhizal fungi that penetrate root cells. Suzanne speculated that the seedlings’ survival hinged upon the presence of their specific mycorrhizal fungus.

In a new and adjusted experiment, Suzanne tried a different approach. She added live soil from an old-growth forest to one-third of the planting sites, irradiated soil to another third, and left the last third as it was. Upon returning the following year, she noticed a breakthrough. Seedlings in the old-growth soil were thriving, in stark contrast to those in the treated or untouched soils which lay dead. Further investigation revealed myriad colorful fungi entwined with the healthy, surviving seedlings.

Elated by the findings, Suzanne recognized the importance of diverse fungi in ensuring tree health and grasped the magnitude of her discoveries’ implications. With contemporary forestry practices shifting toward monocultures, Suzanne felt compelled to learn more about the complex forest ecosystems and their delicate relationships. To fulfill a pledge she made by an ancient birch tree, she would share her knowledge and advocate for preserving these forest connections to save the trees. With her newfound determination, Suzanne embraced the pursuit of additional education and set her sights on graduate school.

The Alder Tree Misconception

Contrary to popular beliefs, keeping alder trees doesn’t harm pine growth. Suzanne’s research found that alders help retain water and provide essential nutrients to pines, meaning that eliminating them is expensive and ineffective. Despite resistance, presenting this vital truth was a necessary step toward better forest management.

In front of a packed audience, Suzanne felt the weight of anticipation as she prepared to present her groundbreaking research. The topic at hand was the effects of alder trees on pine growth, a subject that caused a stir within the forestry industry. Her findings challenged conventional wisdom and exposed uncomfortable but essential truths about the role of alders in sustaining healthy forests.

For years, the forestry industry viewed alder trees as undesirable weeds that depleted water resources, seemingly depriving pines of valuable sustenance. However, Suzanne’s rigorous research painted a much more intricate picture. While alders did withdraw water from the soil, they also released it back through their roots to the surface, ensuring adequate hydration for nearby plants. In contrast, areas without alders experienced dry topsoil, causing rainwater to run off and limit water availability. As a result, plots with more alder trees demonstrated increased water retention, making them ultimately beneficial for the growth of pines.

The revelation didn’t stop with water. Suzanne also uncovered that the decomposed leaves of alder trees release significant amounts of nitrogen, a critical nutrient for pine growth. Removing the alders only provided a temporary supply of nitrogen, while leaving them intact sustained a continuous infusion of this vital element. This compelling evidence shows that eliminating alder trees doesn’t result in better pine growth; instead, it costs millions in unnecessary treatments over time.

Unsurprisingly, Suzanne’s discoveries weren’t met with open arms by those who felt threatened by the potential implications. The Forest Service policymakers were hesitant to accept the findings, but it was an essential step forward in addressing forest management practices.

To blow off steam after her presentation, Suzanne joined her friends, Kelly and Barb, at a local pub for some drinks. However, when Kelly made a chauvinistic comment comparing cows to women, Suzanne’s frustration boiled over. In an impassioned outburst, she made it clear that she wouldn’t tolerate such ignorance. As the evening concluded, Suzanne’s husband Don reassured her that the hard-earned knowledge she brought to light would not go in vain, and things would eventually be fine.

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