Szukana fraza: [Abstract = "The paper presents influence of tree species composition on qualitative properties of humus in soil developed on reclaimed and afforested sand mine excavation KP Szczakowa. Fractional composition and optical properties were determined on 16 samples collected from top soil layer \(0\-5 cm\) under different species\: pure stands of Scots pine, European larch, common birch and black alder. The examined humus were generally characterized by predominance of fulvic acids \(CKf\) in relation to humic acids \(CKh\) and relatively low optical density of humic acid \(E465\/E665\)."]

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