Aartee Mishra is teaching live on Unacademy Plus
Environment Book Summary Presented B Aartee Mishra
SEDIMENTARY CYCLE he Phosphorus cycle Phosphorus, calcium and magnesium circulate by means of the sedimentary cycle Phosphorus Cycle Phosphorus moves in a cycle through rocks, water, soil and sediments and organisms. Key steps of the phosphorus cycle: as hate Over time, rain and weathering cause rocks to release phosphate ions and other minerals. This inorganic phosphate is then distributed in soils and water. Plants take up inorganic phosphate from the soil. Water Soil Rock Phosphate n Soil
Sediment stages 1. Weathering 2. Erosion 2 3. Transportation via water, glaciers and wind Glacier 3 4. Deposition Desert 4 Playa la Sedimentary rocks 55. Burial and compaction 6 6. Diagenesis
The plants may then be consumed by animals. Once in the plant or animal, the phosphate is incorporated into organic molecules such as DNA. When the plant or animal dies, it decays, and the organic phosphate is returned to the soil. Within the soil, organic forms of phosphate can be made available to plants by bacteria that break down organic matter to inorganic forms of phosphorus. This process is known as mineralisation. .Phosphorus in soil can end up in waterways and eventually oceans. Once there, it can be incorporated into sediments over time. .The quantities of phosphorus in soil are generally small, and this often limits plant growth. That is why people often apply phosphate fertilisers on farmland. Animals absorb phosphates by eating plants or plant-eating animals.
Rain Geological uplifting Weathering of phosphate from rocks Plants Runoff Phosphate in solution Phosphate in soil | Leaching Animals Detritus setting to bottom new Sedimentation rocks Decomposers
The Sulphur Cycle . This cycle moves from the oceans. The Sulfur Cycle sulphur is converted by bacteria into Dimethyl Sulphide which eventually becomes Sulphur Oxide or Sulphur Dioxide. Volcanoes also release a Hydrogen Sulphide in an enormous amount which becomes Sulphur Dioxide. Factories and industries also contribute to the atmosphere by producing sulphur gases. These gases, in the form of Sulphuric Acid Fetilizer S WryS0 . and Sulphate,furtherough rainfall. Living is returned back in the environment through rainfall. Living organisms assimilate this sulphuric rain water and assimilate it. The organisms die, their body gets decomposed and again are mixed into the land or water. Solution Organie S Mineral S Leaching High S Coal
nput to soil Loss from s The Sulphur Cyele Atmospheric sulphur Volatilisation Atmospheric deposition Crop harvest SO2 gas Mineral fertilisers Animal manures and biosolids Plant residues Pasture razed Runoff and Elemental sulphur erosion Absorbed or mineral sulphur Plant uptake rganic sulphur Reduced sulphur Immobilisation Bacterial oxidation Sulfate sulphur (soi) rial reduction Mineralisation Leaching