How does carbon enter the biotic part of the ecosystem namely plants from the atmosphere and how does it enter the soil?

Answer 1

Carbon enters the biotic part of the ecosystem primarily through the process of photosynthesis, where plants absorb carbon dioxide (CO2) from the atmosphere and convert it into organic compounds using sunlight. This carbon is then incorporated into plant tissues. When plants die or shed leaves, or when they are decomposed by microorganisms, carbon is released back into the soil as organic matter, enriching the soil with carbon compounds. Additionally, some carbon can enter the soil directly through root exudates released by living plants, which also contribute to soil carbon content.