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Agricultural Matters
Can increasing soil carbon also increase soil CO2 back into atmosphere?
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<blockquote data-quote="CornishTone" data-source="post: 7796133" data-attributes="member: 4147"><p>It’s a great question. I think ultimately increased OM will have have a positive impact on soil biology and all that respiration means the carbon cycle is more active. When this is working right it should be a largely cyclical process with carbon entering the cycle via growing plants taking in C02 and exiting via biological decomposition and respiration. Some of that carbon will “stick” in the soil in the form of humus. The more carbon we can push into that dynamic and active cycle, the more we can hopefully get to stick.</p><p></p><p>It’s worth remembering that an actively growing plant only takes 80% of its C02 from the atmosphere, the other 20% is coming up from the soil, meaning there’s a nice little feedback loop directly from soil to plant and back again. This loop is broken the moment you stop having a growing plant covering the soil. The biology goes on respiring and releasing C02 but there’s not plant to catch it on it’s way up. This is part of the reason that maintaining soil cover with living plants is so important.</p></blockquote><p></p>
[QUOTE="CornishTone, post: 7796133, member: 4147"] It’s a great question. I think ultimately increased OM will have have a positive impact on soil biology and all that respiration means the carbon cycle is more active. When this is working right it should be a largely cyclical process with carbon entering the cycle via growing plants taking in C02 and exiting via biological decomposition and respiration. Some of that carbon will “stick” in the soil in the form of humus. The more carbon we can push into that dynamic and active cycle, the more we can hopefully get to stick. It’s worth remembering that an actively growing plant only takes 80% of its C02 from the atmosphere, the other 20% is coming up from the soil, meaning there’s a nice little feedback loop directly from soil to plant and back again. This loop is broken the moment you stop having a growing plant covering the soil. The biology goes on respiring and releasing C02 but there’s not plant to catch it on it’s way up. This is part of the reason that maintaining soil cover with living plants is so important. [/QUOTE]
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Can increasing soil carbon also increase soil CO2 back into atmosphere?
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