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The effect of different earthworm functional groups on the incorporation of maize (C4 plant) dung into a soil (C3 organic matter background) sown with ryegrass (C3 plant) was explored by using differences in the carbon (C) isotope ratios (12C and 13C) between plant and soil samples in a field mesocosm study. The abundance of earthworms increased with dung inputs, reaching over 4000 earthworms per...
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