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What Happens When A Massive Redwood Tree Falls

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When giants fall in the woods/Parks Conservancy

Editor's note: The following comes from Ryan White at the Golden Gate National Parks Conservancy.

With winter storms buffeting the Bay Area, about 10 to 12 towering coast redwoods in Muir Woods National Monument have toppled during the last two months, according to trail crew members in the Golden Gate national parks.

“We’ve been responding to fallen trees a couple times per week, I’d say,” says Corbett Robinson, a trails maintenance supervisor with the National Park Service. “That’s been going on all winter — or at least when the heavy rains started.”

Wind, soil saturation and destabilization, the rerouting of Redwood Creek (which runs through Muir Woods), and fire are all suspects when trees topple in the national monument.

Members of a National Park Service trail crew surveys a fallen redwood at Muir Woods/NPS, Corbett Robinson

Some Douglas firs and California bay laurels certainly have succumbed to the stormy winter weather. But what happens when a coast redwood — the tallest living thing on the planet — comes crashing down?

“There’s often the distinct sound of cracking and crashing — and a redwood takes a long time to fall because the canyon is narrow,” says Mia Monroe, community liason in Marin. “If a tree falls, other trees catch it, and sometimes it breaks off other branches, and sometimes it skidders and scratches its way down the bark of other trees — and sometimes it takes other trees down. So it’s really a redwood symphony out there of creaks and groans, cracks and sharp thuds, and it’s very, very dramatic.”

After more than 35 years on the job, this awesome scene doesn’t unnerve Monroe. In fact, she considers it a privilege to experience a storm in the famous redwood grove.

“I can see why one of John Muir’s goals was to be in a forest during a winter storm, to hear the trees not only sway and creak, but also [to witness] branches and trees falling,” Monroe explains.

You can get a 9-second example of the epic thuds a falling redwood makes on the NPS's website.

How to Move a Redwood

Bearing witness to such a natural phenomenon is one thing — and dealing with the aftermath is another. When redwood trees fall over trails and park structures, the rough and tumble crew of the NPS trail team comes in.

Depending on the size of the tree, removing a fallen tree that’s obstructing a path can take 10 minutes — or multiple days. In early February, it took a team of seven trail crew members more than three days to remove a particularly hefty redwood (typically, a removal only requires three to five trail crew members).

“It probably weighed around 16,000 pounds,” Robinson estimates, adding that the trunk was 4 to 5 feet in diameter.

According to Robinson, the crew’s primary objective is to cut the tree out of the trail so the pathway is passable again. In a perfect situation, trees would fall perpendicular to the trail, so that crew members can simply cut the obstructing section and “scooch” it out of the way by hand.

But then there are those circumstances presented by the 16,000-pound redwood. Because of its size and the way it fell parallel to the trail, this tree required a rigging system.

“It’s kind of similar to a winch on the front of a truck [you’d use] when it’s stuck in the mud,” Robinson explains. Instead of a truck, however, the crew uses a grip hoist to give them the leverage needed to move the tree — with their bare hands.

And despite the inherent danger of moving living monuments, Robinson and his crew love the work they do — and it shows.

The muscle of the Marin trails crew/NPS, Corbett Robinson

“[I love] watching the trail crew respond, in a way that is so respectful to the trees and so respectful to that natural chaos,” says Monroe. “It’s really wonderful to watch how they’re responding and working with the forest to manipulate it as little as possible, while providing safety and offering new logs to the forest.”

Old Tree, New Life

The trail crew takes such care to preserve natural processes because the collapse of a redwood begins a remarkable regeneration of life.

“One thing I learned very early at Muir Woods is that what we often think of as a crisis in the forest is actually an amazing opportunity — either for additional light to reach the forest floor or for trees to assume a new position as a log on the forest floor, [becoming] amazing time-release fertilizer as it slowly decomposes,” Monroe explains.

It can take centuries for a redwood to fully decompose, all while serving as a “condominium of life,” as Monroe puts it. The new window in the forest canopy admits all-nourishing sunlight for surrounding trees, and the fallen log opens new homes for wildlife (including lichen and insects), expanding the forest food chain and bolstering biodiversity.

When a tree falls into a stream, like Redwood Creek, it also serves a key purpose in providing a safe habitat for aquatic species.

Fallen trees can alter stream flows and enhance habitat/Parks Conservancy

“It slows down the torrents of water that come down in a storm, and when it slows down the water, the gravel deposits — and that’s what the fish need to spawn,” Monroe says. “It also … forms quieter backwaters where fish and other critters can take refuge, and creates deep pools that baby fish need to grow in.”

So when visitors approach Monroe to express their sadness for the fallen redwood trees, Monroe reassures them that their new station — across the forest floor — is actually something to celebrate.

“They don’t really die,” Monroe explains. “That’s why I call it the circle of life — because they’re just taking a new position in life.”

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Comments

On the mystery of Ghost Redwood foliage/albino without  Green-Chlorophyll:

https://www.washingtonpost.com/news/speaking-of-science/wp/2016/10/07/th...

Muir Woods NM harbors some Ghost coastal redwoods shrouded in foggy sunlight filtering from the high canopies.


my husband and I were hiking in Silver Falls State Park in Salem, Oregon, 2010, when we heard a huge thud! The air was very still so it was quite surprising to us.  I was scared but thankful we didn't hear any screams. We never saw it but suprised that it didn't sound like other trees were taken down along with it.  Still amazes me to think about it ....love Mother Nature!


As ancient trees lose their stability, crashing to earth,
new canopy gaps are created allowing more sunlight
to reach the forest floor and providing new seedlings 
essential sunlight to fill the higher canopy space,

Scholarly articles for redwood canopy gap dynamics

 

Repeatability in forest gap research: studies in the ... - ‎Barden - Cited by 69
Dynamics of composition and structure in an old ... - ‎Busing - Cited by 33
Influence of canopy structure on the understory ... - ‎Pelt - Cited by 145

Search Results
[PDF]understory light and gap dynamics in an old-growth forested ...

userwww.sfsu.edu/parker/pages/respubs/HunterEtAl99.pdf
 

This paper describes the under-story light environments and gap dynamics of forests in the ... in most gaps at a high cover, and filling twice as many canopy gaps as it had formed. ... representative of upland redwood forests ...

understory light and gap dynamics in an old-growth forested ... - jstor

https://www.jstor.org/stable/41425288

 
 
 
PDF]canopy gaps and dead tree dynamics: poking ... - US Forest Service

https://www.fs.fed.us/pnw/sciencef/scifi43.pdf


Why doesn't the Park Service sell the wood to a timber company and reinvest the money into improving the park?


shadowmag - please look up the term 'nurse liog' and find out all you can about it. A lot of forests and parks have nature walks that point out such fallen trees with signage or interpretation.


California State Redwood Parks do utilize some fallen old growth coastal redwood logs for timber and lumber

in park construction projects.  The utilized fallen logs must be accessible to equipment even if they are located

along trails when bridge timbers are needed to improve trails.  Perhaps the greatest utilization occurred at Humboldt

Redwoods State Park when many old coastal redwoods had their roots eroded during the floods of 1955 and 1964

and fell across Bull Creek, for example.


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