"When carbon enters the soil ecosystem as plant material (such as crop stubble), it decomposes and returns to the atmosphere as carbon dioxide. Hence the lamentation 'my soil eats mulch', familiar to home gardeners and broadacre croppers alike. While plant residues are important for soil food-web function, reduced evaporative demand and the buffering of soil temperatures, they do not necessarily lead to increased levels of stable soil carbon.
"Conversely, soluble carbon streaming into the soil ecosystem via the cytoplasm of mycorrhizal fungi can be rapidly stabilised by humification and permanently retained in soil, provided appropriate land management systems are in place."
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