There are lots of things I love about camping, but I have to admit, one of them is … s’mores!
Who doesn’t love sitting by a fire, and roasting a sweet, sticky treat?
Now, I know you know that fires are dangerous.
And you might think that all fires are scary, or bad.
But the fact is, many fires are actually really helpful!
Fire is part of nature, like water or wind.
And it does some pretty cool things to keep our natural places running smoothly.
When a fire happens all on its own in nature, like in the woods, it’s known as a wildfire.
And for many plants, a wildfire can be like a good spring cleaning!
In the forest, the ground is usually covered with stuff like dried-up leaves, and logs
from dead trees.
Those things can keep new plants from growing.
But the thing is, even though those logs and leaves are dead, they’re FULL of nutrients!
Nutrients are the things that living things use to ... stay alive!
You and I get your nutrients from food, and your body uses them to breathe, heal wounds,
and grow!
But plants need nutrients, too!
And new, baby plants growing in the forest get their nutrients from the soil, where they
can soak them up through their roots.
So, how does all of that good stuff that’s in the dead logs and leaves get into the soil
to feed new plants?
Well, most of the time, a lot of the work is done by decomposers.
These are insects, fungi, and other living things that eat old, dead stuff, breaking
it up into smaller pieces, and passing the nutrients into the soil.
But that can take a long time!
A faster way that plants can get their food is when a fire comes through.
Because fire acts a lot like a decomposer!
Have you ever watched a fire in a fireplace, or when you’re camping?
Have you noticed that over time, the big logs become smaller...and smaller...until they’ve
turned into a bunch of black and gray powdery stuff?
That stuff is called ash.
It’s what’s left over after a fire breaks down big pieces of wood.
And it’s basically made of all of the nutrients that were in the wood that didn’t burn.
So, ash is like baby food for new plants!
When a wildfire burns through a patch of forest, it leaves a layer of dark, nutritious ash
on the ground, where young plants and new seeds can get the food they need to grow!
So that’s one way that fire can help -- by giving plants food.
But fire does another really big favor for some plants.
Some plants NEED fire ... to make new plants!
Take a look at this tree.
It’s called a sand pine tree, and it’s found mostly in Florida.
The sand pine is a kind of plant that NEEDS fire in order to make new trees.
The sand pine keeps its seeds in pine cones, and over time the cones drop to the ground.
BUT!
The sand pine’s cones will only open if it gets really, really hot -- like when a
wildfire burns through.
Only then can the new seeds fall out of the cones and into the soil, where they can start
to grow!
And the timing works out perfectly for the little seeds!
Because, the soil that this tree lives in doesn’t have many nutrients.
But right after a wildfire, the ground is covered with ash and all of its tasty nutrients!
So that’s the PERFECT time for a seed to drop!
And you know what else?
There are even some FLOWERS that need fire!
This flower, called the blazing star, needs fire for its seeds to grow -- but not because
of the nutrients that fire can provide.
Instead, fire helps NEW flowers get the sunlight that they need!
Like we learned earlier, fire is really good at clearing out dead stuff.
And when a fire burns through a place like an open field, it gets rid of things like
dead grass, leaves, and plants that are low to the ground.
And with all of those things out of the way, it becomes easier for sunlight to reach the
soil.
Then, seeds of plants like the blazing star flower can get all of the sun that they need
to start growing.
So fire is dangerous, for sure, but it keeps forests healthy.
It helps put nutrients back into the soil …
...it helps some trees let go of their seeds at just the right time …
… and it even makes sunny, open spaces for new plants to grow.
Oh!
And of course, you can always use it to make s’mores!
Thanks for joining me on SciShow Kids!
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send us an email at kids@SciShow.com!