• 트위터
  • 페이스북
  • 미투데이
  • 요즘
  • 프린트
bamboo structure

The difference between trees and grasses are their growing points.
Grasses grow from the bottom, so that in one-year-old grass, the visible part above ground is the
oldest section of the plant.
Conversely trees continue growing from the tip of branches, with growth rings.

Bamboo falls between grasses and trees.
Its growth point is the shoot, which is underground like a grass, whilst it has a trunk like a tree,
but no growth rings.

Therefore, none of the various species of bamboo which are common to the region, such as thick-
stemmed bamboo or black bamboo amongst others, are referred to as grasses.
Instead, in accordance
with the Korea Forest Service, they are referred to as trees, since their use is more akin to tree trunks.

Ground Shoots
From the seed buried underground, an initial shoot then grows into a spinning-top shaped stem which emerges up through the soil.
The trunk is thick on the bottom, and as it grows it gradually becomes thinner. The trunk is divided into many joints, or knuckles. In some bamboos, such as thick-stemmed bamboo and black bamboo, the joints are marked by two clear lines, whilst in many others, there’s just a single line.
Why bamboo has joints:
The trunk of bamboo just grows straight up, and, unlike trees, does not grow wider over time.
Therefore, there are no growth rings. Also unlike trees, the bamboo stem is hollow, which makes it strong and prevents bending in the wind.
The joints play a key role in making the trunk strong
The number of joints:
The number of joints is proportional to the length of the stem. Thick-stemmed bamboo Phyllostachys bambusoides has 71, black bamboo Phyllostachys nigra has 43, and Phyllostachys edulis has 73.
Distance between joints:
Phyllostachys bambusoides and Phyllostachys nigra have diameters of less than 5cm and joints 12-40cm apart and 7-27cm apart respectively. Phyllostachys edulis has a diameter of over 6cm and 28-54cm between joints.
Rims:
The joints mark the division of the whole trunk into repeating cells
Between joints:
Each joint, or node, marks the end of a cell. The section between nodes is hollow.
Why it’s hollow:
The reason for this hollow space between nodes is that the trunk wall grows very fast but the cell-division inside the trunk is much slower.
Where’s the longest cell?
The longest cells, or distances between joints, are usually located in the middle of the stem or above. For species with diameters under 5cm, Phyllostachys bambusoides and Phyllostachys nigra, this is between the 10th-28th joints, and 4th-19th joints respectively, while in the wider 6cm-diameter species Phyllostachys edulis, this is between the 12th-23rd joints.
Why bamboo grows vertically:
Bamboo grows straight up since all growth happens on the bottom of all joints.
Underground Structure:
Under the soil, the bamboo plant has a rhizome which runs off to the side underground, from which other new buds and shoots
may grow. There is also a network of very fine roots which extend into the soil.
It plays a bigger role supporting the bamboo thicket than the above-ground trunk, but the bamboo sheath dies the next year.
As a bamboo stem goes down to the ground, the number of joints becomes less, and proportionately thicker. The main stem trunk
emerges directly from the ground.
The amount of time a shoot grows for underground before breaking the surface varies with different kinds of bamboo. Shoots
normally grow well in August and September and stop growing in mid or late December.
Thin bamboo emerges from a 5- or 6-year-old underground rhizome, and small bamboo from a 7- or 8-year-old underground rhizome.
Leaves:
Bamboo leaves are green all year around, flat, and with a round bottom and sharp end, in a double-faced pattern.
The number of the leaves on a branch varies with species. Phyllostachys bambusoides usually has 5-6 leaves per branch,
Phyllostachys nigra 4-5, and Phyllostachys edulis 2-8. The leaf surface is green, and the back of the leaf is white. Phyllostachys
bambusoides has wider leaves than the Phyllostachys nigra and Phyllostachys edulis.