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Two soils developed over 21 years on a homogeneous mine spoil bank — one under a pure plantation of Quercus robur L., the other under a mixed plantation Q. robur L. and N-fixer Alnus cordata Loisel. — were compared and contrasted in terms of quantity and quality of organic matter. The amount of both organic C and N are significantly higher in the mixed stand, with the differences confined to the mineral...
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