离子吸收(植物)（Ion absorption (plant)）.docVIP

离子吸收(植物)（Ion absorption (plant)） Ion absorption (plant) The process in which plant cells absorb inorganic elements in an ionic form from the medium. The ion passes through the cell wall, through the cell membrane (plasma membrane), into the protoplasm, and part of it enters the vacuole. Plant ecologists estimate that terrestrial plants produce about 1000 tons of dry matter a year. Every year, plants collect 50 tons of minerals from the soil, based on 5% of the minerals in dry matter. In this way, large amounts of minerals are absorbed from the soil by roots. In addition to maintaining the life of the plant itself, it also provides most of the animals needs. Under the same conditions, the absolute and relative amounts of various inorganic nutrients contained in different kinds of plants vary greatly. This difference is sometimes due to their root size and shape of the different absorption and distribution of root in soil caused by the different decisions of different nutrients; sometimes due to absorption of nutrients in the plant itself is selective, such as grasses in calcium than leguminous plants, even if they are in the same culture medium is this. This phenomenon shows that there are genetic differences in the absorption of nutrient elements in plants. In addition to foliar fertilization (Root outside fertilization), the inorganic nutrients of plants are all obtained from the soil through roots. Roots can absorb nutrients in the form of ions in the soil solution, such as nitrogen is NO Yin, NH Xu; P H2PO Han sulfur SO Han; metal elements such as K+, Ca2+, Mg2+ etc.. These ions must be passed through the cell membrane before being utilized by plants. If it is along the media and cells between the electrochemical potential into the cell is called passive absorption, if it is against the electrochemical potential into the cell, it is called active absorption. The process of passive absorption of ions into the cell to cell concentration difference and the power and