Page 7 - Tài liệu Ebook cây cảnh Bonsai Basics

HOW T REES GROW 9

ANATOMY OF A TREE

Whatever its species or variety, a tree has capillary structure of lhe roots creates a
a particular anatomy, or structure, continuous upward movement of water
which is found in every example of its in the soil, making sure that the tree
kind, regardless of age. obtains all the substances it needs. The
normal development of the aerial part of
the tree (the focus of our interest) is
Underground parts linked to root development. If root
These consist of the roots of the tree growth is inhibited, the aerial part of the
which draw from the soil those sub- tree will stop growing and may even die,
stances which are vital to the tree's as a tree can only survive by growing. In
growth. A complex network of roots and bonsai, root growth is always restricted
rootlets ensures that the tree is at once by the size of the container, which is why
firmly anchored and also fed. The these trees must be regularly repotted.

The diagram shows how the roots relate to the The root system is far less important in bonsai than
branches and foliage of a tree in its natural state. it is in a tree allowed to grow naturally.