Question

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❥︎question :

⭕why do soil have lowest diffusion rate?

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Answer 1

Answer:

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Explanation:

Gas transport in the soil is a phenomenon in which gases move mainly by diffusion. Diffusion is defined as the random movement of particles due to kinetic energy; it may occur in a gaseous or liquid medium, with a net movement of the diffusing substance from a higher to a lower concentration (Hillel, 2003).

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Answer 2

Answer:

Hyy

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★Answer

This chapter focuses on the gas diffusion in soil. Oxygen is consumed and carbon dioxide is generated by the metabolic activity of microorganisms and plant roots in the soil. Oxygen, carbon dioxide and water vapor all diffuse into and out of the soil. Soil air is typically around 79 % N2. The remaining 21 percent is mostly CO2 and O2, which vary reciprocally. The absorption of nutrients by roots, and the beneficial activity of microorganisms depend on an adequate supply of oxygen. The rate of respiration of living organisms in the soil depends primarily on the availability of oxygen and carbon in the soil, and on soil temperature and soil moisture. Oxygen consumption is greatest when organic matter is incorporated into moist, warm soil. Respiration rates in winter are often suppressed because of low temperature and low oxygen concentration. In the summer, low soil water potential may inhibit respiration. Respiration rates are usually highest in spring months when roots are growing rapidly, root exudates are plentiful for microorganism growth, and moisture and temperature conditions are favorable. The chapter describes the gas exchange for individual roots or microorganism colonies in the soil and gas exchange between the soil profile and the atmosphere.