Can You Hear the Trees Talking?. Peter Wohlleben

Can You Hear the Trees Talking? - Peter Wohlleben


Скачать книгу
see that its trunk is made up of

      a

      series of rings.

      Each year a new circle of wood grows under the

      tree's bark, and the trunk grows wider and wider.

      Once wood

      is

      there,

      it doesn't

      go away. Because

      a

      trunk only

      grows around the outside,

      in a

      thin layer between the bark and

      the

      wood,

      everything already inside the trunk

      stays

      the

      same,

      And so

      a

      tree never gets thinner, only thicker.

      That's a good thing, because the tree is also

      growing taller, and that means it's getting heavier. It

      needs a sturdy trunk to support its weight, just like

      you need

      a

      strong skeleton to support your growing

      body. That's why adults are stronger than children,

      and older trees are stronger than younger ones.

      There's something else trees have that makes them

      similar to people. Your blood flows through tiny tubes

      called arteries that run from your heart to every part

      of your body. Trees have to pump water from their

      roots

      all

      the way

      up

      to their

      crowns,

      so

      they

      have an

      extensive system of tiny

      tubes,

      too, called vessels.

      You might be able to see these water vessels if

      you

      look at the rings in

      a

      piece of wood—they look like

      small holes.

      But water only flows in the tree's outermost

      rings.

      That's why in the summer, if everything is

      working properly, a tree will be quite wet under

      its bark, Farther inside, the wood becomes drier.

      Nothing's happening there anymore, and the tree

      can't feel anything there, either. That's why it

      doesn't really matter if the inner wood begins to

      rot. Even if its trunk becomes hollowed out like an

      empty pipe, the tree will still

      be

      just fine,

      *

      But there's one more question. Why does

      a

      tree

      need

      a

      trunk at all? Couldn't its crown grow

      straight out of its roots?

      A

      tree needs a trunk so it can grow taller than

      all the other plants around it, Otherwise it would

      just be

      a

      bush. (Bushes don't have trunks.) Since

      they're the tallest plants in the world, trees

      don't need to be afraid of other plants. They can

      grow above them all—except for other trees, of

      course. [We'll find out later why there are some

      anxious oaks out there.)

      FIND

      A

      BIRCH

      LOG.

      If your family

      buys

      firewood,

      it

      will often

      have

      birch logs

      in It—you can

      recognize

      them by their white

      and

      black

      bark.

      If

      you

      don't

      have any firewood at home, ask your friends

      who have fireplaces or fire pits.

      Spread some dish detergent over one end of

      the log. Now press your lips against the other

      end

      and

      blow.

      If

      the

      experiment works properly,

      you'll see soap

      bubbles

      coming

      out.

      That happens

      because the air you blow travels through the

      water vessels in the wood until it reaches the

      soapy film at the other end.

      A tree is a trunk with branches and twigs on ft. Leaves or needles

      grow on the twigs. But something really important is missing from this

      description: the roots. They're the first part of a tree to grow.

      AS SOON AS A SEED SPROUTS, a small root tip grows

      down into the ground. It feels its way around to find

      the best place to keep growing. (Roots like soft, loose,

      damp soil the best.)

      The

      root spreads out and divides.

      As the root divides, it grows fine hairs along its

      length that increase its surface area so it can suck up

      more water from the

      soil.

      These hairs dry out very

      easily—that's why if

      you

      bring

      a

      baby


Скачать книгу