Most of what we call “wood” is actu

Most of what we call “wood” is actually layers of xylem. These cells build up year after year, layer on layer. As woody stems grow thicker, the older xylem near the center of the stem no longer conducts water and instead becomes what is known as heartwood. Heartwood usually darkens with age because it accumulates impurities that cannot be removed. Heartwood is surrounded by sapwood, which is active in fluid transport and therefore usually lighter in color.
In most of the temperate zone, tree growth is seasonal. When growth begins in the spring, the vascular cambium begins to grow rapidly, producing large, light-colored xylem cells with thin cell walls. The result is a light-colored layer of wood called early wood. As the growing season continues, the cells become smaller and have thicker cell walls, forming a layer of dark wood. This darker wood is called late wood.
This alternation of dark and light wood produces what we commonly call tree rings. Each ring is composed of a band of light wood and a band of dark wood. Thus, a ring corresponds to a year of growth. By counting the rings in a cross section of a tree, you can estimate its age. The size of the rings may even provide information about weather conditions, such as wet or dry years. Thick rings indicate that weather conditions were favorable for tree growth, whereas thin ring indicate less favorable conditions.

ผลลัพธ์ (อังกฤษ) 2:

Most of what we call "wood" is actually layers of xylem. These cells build up year after year, layer on layer. As woody stems grow thicker, the older xylem near the center of the stem no longer conducts water and instead becomes what is known as heartwood. Heartwood usually darkens with age because it accumulates impurities that can not be removed. Heartwood is surrounded by Sapwood, which is active in Fluid Transport and Therefore usually lighter in Color.
In the Temperate Zone of Most, Tree growth is seasonal. When growth begins in the spring, the vascular cambium begins to grow rapidly, producing large, light-colored xylem cells with thin cell walls. The result is a light-colored layer of wood called early wood. As the growing season continues, the cells become smaller and have thicker cell walls, forming a layer of dark wood. Late Called Wood Wood is darker this.
This alternation of Light and Dark Wood produces what we commonly Call Tree Rings. Each ring is composed of a band of light wood and a band of dark wood. Thus, a ring corresponds to a year of growth. By counting the rings in a cross section of a tree, you can estimate its age. The size of the rings may even provide information about weather conditions, such as wet or dry years. Thick rings indicate that weather conditions were favorable for tree growth, whereas thin ring indicate less favorable conditions.