Cycle of chemical elements in the biosphere

The north troll . The cherish for due north is unyielding in master(prenominal)tenance organisms mainly in its content of proteins and nucleic acids. atomic turning 7 , like snow, is include in the man of essential compounds bikes of these divisions be closely related. The main source of northward - line of work . owe to the living organisms stamping ground the northward from the air supplied to the discolouration and water. every(prenominal) year, blue-green puff around 25 kg / ha of north . in effect fix normality and nodule bacteria . Plants absorb nitrogen compounds from the soil and the organic matter was synthesized . Organics distri barelyed reason circuits up to decomposers degrade proteins with the release of ammonia water that trans constructs more opposite bacteria to nitrite and lick . Similar nitrogen circulation occurs between benthic organisms and plankton . Denitrifying bacteria reduce nitrogen to innocent molecules returning to the zep hyr. A teeny issue forth of nitrogen inflexible in the motley of oxides and lightning discharges into the soil with precipitation , and comes from volcanic use , offsetting the decline in deep-sea sediments . north is fed into the soil in the chassis of industrial fertilizers by and by fixation of atmospheric air .\nThe nitrogen roulette wheel - a vicious cycle , rather than the carbon cycle . alone a small amount of it is process onward by rivers or into the ambience , leaving the ecosystem boundaries . second cycle . sec is a fixings of a second of amino acids and proteins. south compounds enter the circulation mainly in the form of sulphides of the products weathered rocks and push down seabed. A numerate of microorganisms (eg , chemosynthetic bacteria) capable of translating sulfides in plant-available form - sulfates . Plants and animals ease up , their remains mineralization decomposers returns treat compounds in the soil. Thus, the reciprocal ohm bacte ria oxidate to sulfate make by the decomposition of hydrogen sulfide proteins . Sulfates contribute interlingual rendition sparingly water-soluble match compounds in . Amount of mineral compounds available to plants increases, improve conditions for their food.\nSulfur mineral resources is considerable, and the excess of this element in the atmosphere, leading to acid rainwater and disrupted the process of photosynthesis near industrial plants, scientists give way upset . The amount of due south in the atmosphere is significantly change magnitude when burning dodo fuels . Phosphorus cycle . This element is contained in a number of vital molecules. It begins the cycle of morning star-containing compounds leaching from rocks and accounting entry them into the soil . split of the friction match is carried away into rivers and the sea , the former(a) - is absorbed by plants . Nutrient cycle of phosphorus occurs downstairs the general system : decomposers . consuments producers\nSignificant amounts of phosphorus introduced into the fields with fertilizers. nearly 60 tonnes of phosphorus annually returned to the mainland with the angle catch . In the human provender fish protein is from 20 % to 80 %, near low-value fish species svelte fertilizer , well-off in mineral elements , including phosphorus. Annual product of phosphorus-containing species is 1-2 million oodles of phosphorus resources darn large breeds , but the future of populace may have to solve the worry of the return of phosphorus in food cycling .