
what are the tree leaves for ?![]() The leaves capture CO2and mineral ions through the stomata, located bellow (they are not blocked by dust). It has between 10 and 200 per mm ² (knowing that a tree is making a thousand square meters of mature leaves, what is the number of stomata? .... between 10 and 200 billion). The air sucked through the stomata is attacked by sap flowing through the leaves. The sap contains primarily water, pumped into the ground by the roots (aided by evaporation in the leaves because evaporation created a depression). If the air is saturated with moisture, the roots repress ground water, creating a local overpressure. In the presence of water (H2O), the CO2 molecule is broken into carbon and oxygen. Oxygen (O2) is released into the air. Carbon, hydrogen associated with water, produces carbohydrates (hydrocarbon, Hn-Cn). They are stored in the trunk (cambium), during the summer to prepare for the spring bloom and make future leaf essential to the continuity of the cycle. Some cells will turn into wood. The leave also carries the amino acid synthesis using nitrates captured in the ground. To activate these reactions, the leaf needs, as in any factory, power: it is the energy of light is used, and the reaction activated by light is called photosynthesis. There comes a well known pigment, chlorophyll, which gives the leaf its green color. At night, photosynthesis stops and respiration is reversed: the leaves capture the oxygen and release some CO2. To produce one kg of carbon material, the leaves have to treat 4000 m3 of air (a cube of side 16 m). It is estimated, in temperate forests, timber production to 3.9 t / ha / year of logs, which are added to 1.2 t / ha / year of classes. After the death of trees, bacteria break down carbon and nitrogen, and restore them in the form of carbon dioxide, ammonium and nitrate. |
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