Sedimentary Biogeochemical cycle:-

It is circulation of a biogeochemical between biotic and abiotic compound of an ecosystem is a nongaseous being lithosphere or sediments of the earth. Sedimentary cycles occur in case of phosphorus, calcium, magnesium, zinc, copper etc. Important feature:

(i) Input of Nutrients:-

Nutrients enter the nutrient pool through weathering of rocks. In sites soil formation also occur through weathering of rocks. Nutrients present in the soil become available to plants. Wind carries nutrients from mining areas and industrial area and deposited over the soil.

(ii) Internal nutrient cycling:-

It is cycling or circulation of nutrients with in the ecosystem. Plants absorb nutrients from soil and incorporate them into organic matter. In the form of organic matter the nutrients pass from producers to herbivores and herbivores to carnivores. The process is called transfer. All trophic level pass a part of organic matter as detritus.

Detritus acted up on by decomposers and release the nutrients back into cycling pool. In stable ecosystems, over 80% of nutrient requirement of the biotic is met through internal nutrient cycling.

(iii) Out put of Nutrients:-

It is a movement of nutrients out of an ecosystem. Out put reduces the availability of nutrients in the cycling pool. It occurs through soil erosion, run off water and economic out put like harvesting of crops or removal of wood from forest. Crop fields are always under negative nutrient budget.